Cargo-Work-Full-Notes.pdf

Malaysian Maritime Academy

Correspondence Course

Cargowork

MODULE 1 -TYPES OF CARGO Brief description on types of cargoes carried onboard merchant ships are as follows: -

General Cargo The modern term for these types of cargoes is breakbulk cargoes. It consists of individual items, e.g. pieces of machinery, bags, bales, and small quantities of liquids e.g. late in deep tanks etc. !eavy items may be lifted onboard using ships gear or shore cranes.

Grain "rain comprises of wheat, corn, rye, barley, oats, rice etc. "rains are liable to heat and#or sweat, especially if damp, when they may germinate or rot, therefore requiring careful pre-loading inspection, carriage and ventilation. In ma$or grain ports, handling equipment%s are sophisticated, grain elevators being equipped to unload railway wagons, lorries, barges or coastal craft and to reload from storage silos at high speed into ocean going ships. &or discharging grains, the pneumatic sucker system, evacuators and grabs may be utilised.

Timber

Includes timber and its by product - e.g. hardwood and softwood logs, sawn timber, wooden products, wood chips wood pulp and paper products. 'here practicable, timber as it is, is carried on deck. The securing and proper stowage of deck timber has the effect of increasing a ships freeboard and because of this timber carrier may be allotted lumber loadlines in addition to the usual load lines. Timber loadlines allow ships to load more cargo as compared to the ordinary load lines as it has the following effects: a. (eserve buoyancy of vess el is incr eased by compact mass of buoyant timber above the freeboard deck. b. )ffective freeboard is increased with beneficial effect on the range stability. c. 'eather deck hatches are protected.

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Coal *oal is a minerali+ed fossil fuel widely utilised as a source of domestic and industrial power. s a sea borne product, it is always carried in bulk. It varies from soft bituminous type to hard anthracite through to manufactured coal products. espite the carriage of coal being an established trade, it remains as a difficult and dangerous cargo to transport due to dangers of gas eplosion, spontaneous combustion, and cargo shifting during passage and corrosion to ships hold.

Fertiliser ay be carried in bulk, bags or liquid forms. ost fertili+ers are harmless, especially in bags but a few can be eplosive and#or corrosive. The I/ angerous goods *ode should be consulted when carrying these cargoes.

Cement It may be subdivided mainly into bagged or bulk cargo in either finished cement or clinkers. It should be kept scrupulously dry so as to avoid solidifying. It is often preferred to load bagged cement into the tweendecks of general cargo ships having the facility of reducing the height of stow which in the case of ecessive tier heights in single deck ships may cause splitting of lower stowed bags. The handling of clinker is not so critical as it is normally carried in bulk0 it can however be etremely dusty and is therefore sub$ected to shore-based anti pollution regulations.

Livesto! 1ormally carried on the weatherdeck in tiers of specially constructed pens. Includes sheep, goats, cattle and buffaloes. /n this type of trade it is not unusual for ships to carry up to 233,333 animals and thus the provision of adequate of fodder and drinking water is a ma$or problem.

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Metals

Li$%i"s

These covers the whole range from raw base materials to metal articles e.g. steel products to scrap metal. ll steel products are liable to shift at sea and need careful stowage, not only to prevent any movemen t, but also to avoid seriously damaging the ship.

7ea borne liquids range from drums of products such as bitumen capable of carriage in conventional tween deck ships, to parcels of edible oils transported in specially coated and heated tanks and to huge homogenous cargo of crude mineral oil carried by 89**%s.

(ust will seriously affect the value of steel products and every effort should thus be made to avoid its occurrence.

ost of these products are inflammable with a low flash point and many are dangerous in other ways, either emitting toic gases or possessing corrosive qualities or both.

Unitise" Cargo

ny two or more cargo $oined together is said to be unitised - strapping together, preslinging, palletisation, containeri+ation, etc. lthough unitisation may increase costs to some etent 4etra packaging cost5, it enhances cargo handling operations, reduce pilferages simplify tallying, reduce the number of people per gang. In another words it contributes greatly to a faster turn around time for the ship. )ample of unitised cargo is of soft drinks packed on pallet.

Containers *ontainers are basically $ust a bo in which cargoes are placed and the bo itself is transported. a$ority of general purpose containers are boes constructed with walls of aluminium or thin steel sheeting, corrugated to provide strength and rigidity, reinforced corner posts with double watertight doors at one end. 6sed to carry various types of cargo e.g. tobacco, electronic components, clothing etc.

Ree#er These are mainly concerned with the carriage of fruits and vegetables and are seasonal, relying on the harvesting of crops around the world. /ther reefer cargoes include fro+en fruit $uices, flowers and bulbs, dairy products, meat, poultry and fish, pharmaceuticals, -ray films etc. They are handled either as a break

Gases *onsists mainly of liquefied petroleum gas 9" and liquefied natural gas - 91". 9" consists mainly of propane and butane and are carried either under pressure at ambient temperature, fully refrigerated 4-;3° to <= °*5 or semi refrigerated under a combination of pressure and reduced temperature. ny gas that vaporises during handling and carriage will be reliquefied and circulated back to the tanks. 91" is mainly ethane with propane and butane making up the balance. It is carried at or near its boiling point temperature of - 2>< °* at atmospheric pressure. /ne of the particular features of 91" is that cargo boil off is used as fuel by the ship. !owever, given the high value of natural gas, the use of boil off for such purpose is becoming uneconomic and efforts are being made to reduce the daily rate of boil off to below 3.?@A of cargo quantity.

Dangero%s Cargo 6nder the auspices of I/, a angerous "oods *ode has evolved encompassing recommendations as to stowage, carriage, packaging, documentation and labeling of most dangerous commodities. Bulk carriers are likely to be affected by the carriage by one homogenous dangerous cargo at a time e.g. sulphur in bulk or a chemical tanker is likely to carry several lots of dangerous bulk liquids at any one time.

bulk, in pallets clean or in containers. They require scrupulously and odorless cargo !owever, it is the general cargo ships or compartments to avoid contamination and the container ships, which can be epected to carry several classes of dangerous goods at carriage temperature is absolutely critical. any one time, the relative effect of which in

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relation to stowage and reaction between cargoes can be somewhat complicated. IMDG code covers carriage of dangerous goods in packaged from or in solid form in bulk. The I" code comes in < volumes plus a supplement. nother publication dealing with carriage of dangerous goods in 6 is known as CBlue BookD.

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advantage, with due regard to the necessary care and attention to conditions of stowage. Thus, the freight earning capability of the vessel is kept at a maimum. To do this it is necessary to know the amount of space, which each tonne of a commodity will occupy. 7T/'") &*T/( is defined as the volume in cubic meters a tonne of that cargo will occupy.

NOTE - etail description of specific cargoes

The figure does not epress the actual measurement of a tonne of the cargo but takes

will beappropriate. given in the subsequent modules where

into consideration the necessary for dunnage and the form and design of the packages.

&ale Ca'ait( This is the cubic capacity of a cargo compartment when the breadth is taken from the inside of the cargo battens or from the inner edges of the frames, and the heig ht from the tank top to the lower edge of the beams and the length from inside of the bulkhead stiffeners or sparring where fitted.

Grain Ca'ait( This is the total internal volume of a cargo compartment measured from shell plating to shell plating and from tank top to under deck and an allowance is given for the volu me

)amples of stowage factors are: *oal 2.2=#2.;; cu.m.#tonne. ai+e 2.;E cu.m.#tonne. (ubber in bales. 2.=2#2.=E cu.m.#tonne n intelligent knowledge of the use of stowage factors is necessary to all cargo officers in order that they may make economic use of each available space unit.

&ro!en Sto)age

This is defined as that space in a loaded cargo compartment that is not filled with cargo. It is the space occupied by dunnage, the space between packages and the space that is left occupied by frames with and the beams. Thisofspace not only associated carriage grain,is over the last tier placed in stowage. Broken as such, but with any form of bulk cargo , stowage is epressed as a percentage of the which would stow similarly, that is to say total space of the compartment. The percentage that has to be allowed varies with completely filling the space. the type of cargo and with the space of the It is obvious that a solid cargo can be stowed compartment. It is greatest when large cases only up to the limits of the frames and beams have to be stowed in an end hold due to the whereas bulk cargo will flow around such shape of the compartment. Broken stowage in members. Therefore when measuring for an end hold due to the shape of the general cargo, it is the bale capacity, which is compartment. Broken stowage on uniform packaged commodities will average about 23A taken into consideration. that on general cargo will average about ?@A. lthough both grain and bale capacities are &or eample: normally used to show the volume or capacity a5  consignment of apples packed in bo es having stowage factor 2.;2cu. m#ton to be of a ship to carry cargo, other units of measurement are more appropriate for loaded in a cargo space having bale capacity specific trades, e.g. T)6s for container ships, equals to 2333cu m. *alculate the total amount lane-metres for (o-(o ships, etc.

Sto)age Fator &or successful loading, a vessel must utili+e every cubic meter of space to the best

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in weight that can be loaded. "iven cargo hold space F 2333 cu m cargo stowage factor F 2.;2

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∴ cargo

loaded


volume

F

stowage factor

F

2333

2.;2 F E>;.;> Tons #

b5 6sing the above question 425 *alculate the tota l amount of cargo to be loaded if 23A broken stowage is allowed. 1ett volume occupied by cargo allowing for 23A broken stowage

∴

F 2333 cu m 2.2 F G3G.3G cu m G3G .3G cu m cargo loaded F 2.;2 cu m#ton F >G;.G> Tons

Dea")eig*t Cargo Is cargo on which freight is usually charged on its weight. *argoes which measures 2.??cu.m.#tonne 4s.f5 or less is classed as deadweight cargo.

Meas%rement Cargo Is cargo on which freight is usually charged on the volume occupied by the cargo and this cargo is usually having a stowage factor light, of bulky morecargo than 2.?? cu.m.#tonne. It has been the custom to set two standards by which cargo is measured and freight is charged. This is in order to avoid ecessive freight charges, which might be out of proportion to the space occupied by a particular consignment, and to protect the ship from loss of freight commensurate with the amount of space used.

A" +alorem Cargo &reight for certain epensive cargoes, e.g. precious stones, fold bars, etc. is not levied based on weight or measurement but on the value of the cargo.

Cargo Do%mentations a) Mate’s Receipt (M/R) - is a document of receipt given by the ship%s chief officer 4the ate5 for goods actually received on board. It

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is carefully drawn up to show the identification, description and quantity of the goods 4as verified from the ship%s tally sheets5. ny damage to the cargo noticed before loading on board is entered on the #( and the receipt is then said to be Hclaused%. ll particulars from the #( are transferred to the HBill of 9ading%.

) Bill of Lading (B/L) - is properly prepared by the ship-owner 4or his agent5 from details in the ate%s (eceipt, and delivered to the shipper - freight being usually paid at this stage. It is document, which provides evidence ofaa legal Hcontract of carriage% between the shipper and the ship owner 4the carrier5. It also acts as a document of title to the goods described therein i.e. the holder of the B#9 is regarded as the rightful owner of the cargo.

c) Cago Manifest - is a document containing a detailed and complete list of cargo Has loaded%, compiled by the ship owner 4or his agent5 from the Bill of 9ading. *opies of the manifest are delivered to the ship, the stevedores at the discharging ports and to *ustoms authorities at the discharging ports. s it is a comprehensive record of all cargo in the vessel, it permits the checking of cargo during discharge thereby avoiding overcarriage#short landing. "overnment uthorities may use it as material for compilation of the national trade statistics vi+. the nation%s imports#eports.

d) Cago !lan - is a plan drawn up by the ship%s cargo officer showing the stowage of all cargo on board the vessel. *opies of the plan are sent in advance to the discharge ports so that preparations for her unloading can be made before arrival at the port. long with the summary of the cargo on board, a well drawn up cargo plan greatly assists in facilitating discharge and avoidance of overcarraige#short landing of cargo. e) Dangeo"s Cago List - a shipper is obligated to declare to the aster full details of any dangerous#ha+ardous cargo shipped by him and covered under the CInternational aritime angerous "oods *ode% 4the I...". *ode5. The aster is required to prepare a list of all dangerous#ha+ardous cargo

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shipped on board. It should show the correct technical name of the commodity, its Hclass% as per the I...". *ode, its quantity and weight, position of stowage on board, port of loading and the port of discharge.

Pre'aration O# ,ol" Prior To Loa"ing General Cargo s temporary custodians of the cargo, it is the duty of the ship%s officers to ensure that cargo is delivered in the same condition as it was received on board. Besides ensuring that damage to cargo does not occur during handling 4slinging, lifting by derricks#cranes, working forklifts etc5, it is also important to prevent damage as a result of the condition of the hold itself. 2.3 Cleaning t#e $old 1"1 The method and amount of cleaning required will depend upon the type of cargo previously carried in the hold. "enerally speaking, a hold which is ready to receive cargo should be swept clean, dry, well ventilated and free from odour of the previous cargo4es5.

1"2 The hold should be cleaned prior to loading. The degree of cleanliness required will depend on the nature of the cargo to be loaded. *argoes such as grain, sugar etc. will need a scrupulously clean hold 4and usually surveyed5 before loading can commence, whilst cargoes such as coal, steel etc. may not require the same level of cleanliness. ?.3 Inspecting t#e $old fo da%ages& testing 'ilge and fie sste%s fter cleaning the hold the following inspections#tests are normally carried out: ?.2 Inspection of the hold for internal damages - e.g. pipe guard, ladder rungs, leaking pipes, bilge sounding striker plates, leaking rivets#welding seams etc. ?.? Testing the Bilge pumpi ng system - This is done if it has not been carried out earlier during washing of the hold etc. articular attention is paid to ensure that the bilge suction non-return valve is working and

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Hbacklash% does not occur when the bilge pump is stopped. ?.; *hecking the hold fire detection # etinguishing systems - most ships are fitted with the */? etinguishing system and the */? lines to the hold are cleared by passing compressed air. 6sing artificial smoke usually checks the detection system. ?.< *hecking oil#water tightness of the ouble Bottom tank top and its manhole covers - this is done by and pressing up the tank to a head of oil#water checking for leaks. ;.3 Maing t#e $old *e%in fee 8ermin such as rats, cockroaches, silver fish etc, in the holds, can cause etensive damage to cargo on board resulting in huge damage claims from shippers#consignees. It is a requirement by law that every ship must be in possession of a valid erating *ertificate. The ort edical /fficer issues this certificate after fumigation by the burning of sulphur or the release of cyanide gas has been carried out. The certificate is valid for si months, after which a erating )emption certificate will be issued if no diseased rats or a large number of rats are found on board. The rat population may be kept to a minimum by the use of anticoagulant bait, such as sodium fluoracetate. *ockroach bait, pesticides and insecticides may be used to eterminate cockroaches and other insects. *leanliness is the most important factor in keeping a ship vermin free. 'hen certain cargoes such as rice, are loaded, the holds are fumigated after loading to rid the cargo of weevils.

Assignment lease submit the following assignment to 9 25  hold, bale capacity ?333 cu m contains, 2?33 tonnes of bagged flour, 4stowage factor 2.2@ cu m#tonnes5. *alculate the broken stowage. ?5 escribe a cargo hold preparation in your last ship and state the cargo loaded. 7tate the preparation of hold prior to load general cargo.

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MODULE  - FACTORS TO CO.S/DER FOR GE.ERAL CARGO STO0AGE The following must be borne in mind when loading general cargo: -

turn round% is also dependent on port facilities for clearing the cargo etc.

25 *argoes should be we ll distributed in all hatches to increase the ort speed. ?5 &oodstuffs and other cargoes liable to tainting - need proper separation #segregation to avoid tainting damage.

The follo wing points must be borne in mind when planning loading of "eneral *argo by *hief ate or officer in charge of loading. a5 7afety of the ship

;5 !eavier cargo should be placed on deck#tank top whilst lighter cargo on top of these cargoes to prevent crushing damage. <5 It is a general rule that fragile and light packages are stowed in tween deck4s5 to avoid the effects of roll and pitch of vessels. @5 )nsure packages stowed evenly 4not tilting5, for eample near turn of bilge, end holds by the proper use of dunnage to achieve compactness of cargo stowage. >5 9ight packages 4cartons, etc.5 stowed away from cargo hold obstructions such as frames, deck beams, stiffeners. E5 8aluable cargo should be stowed in strong rooms or in *hief /fficer%s office. =5 To avoid cargoes being crushed during slinging use proper gears like pallet, spreader. G5 roper securing of cargoes and lashing are essential. )tra pad eyes may have to be welded to have more securing points for lashing cargoes.

Port S'ee"

General Cargo Sto)age

   

stability considerations proper trim#list#draught avoiding structural stresses avoiding physical damage from cargo

b5 7afety of the crew and port workers  preventing unstable cargo blocks  avoiding blocking of escape routes #safety appliances  protection from toic fumes#fire ha+ards c5 voiding damage to cargo  avoiding condensation#water damage  protection from taint # contamination # interaction  preventing physical damage to cargo  preventing pilferage d5 aimum use of available space on board  minimi+ing Hbroken stowage  using Hfiller% cargo e5 (apid and systematic discharging and loading  providing maimum number of working hatches#even distribution  preventing over stowed cargo  preventing over carried#short landed cargo 4proper segregation#marking5.  enhancing Hport speed%

)ach day that a ship remains unnecessarily in Cargo Plans port results in a reduction of the ship%s  cargo plan is a plan showing the disposition earning capacity. n unnecessary delay in and distribution of cargo throughout the vessel, port increase the port dues allied costs and in as much detail as is possible. encroaches on the time that she would have been steaming on her net voyage.  cargo plan for a general cargo ship will usually be drawn up at the last port of loading 7hips officers should aim for increasing Hport from information derived from the deck officers speed% by efficient distribution of cargo, cargo workbooks, from mates receipt and from readiness of cargo spaces etc. This Hspeed of

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loading plans produced by shore personnel at the load ing ports. *opies of the plan will usually be sent ahead of the ship to the discharge ports. 'hilst the plan is not a scale drawing, it should show with some accuracy the location of specific parcels of cargoes in the locker doors, hatchways so that the order of discharge may be planned 'hilst the format of the plan will vary from company to company, most plans will show the lower

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reference.  summary of total tonnages loaded in each hold and other information regarding dead light, as fuel, stores and water0 means of separation used between particular parcels and the total space remaining are also appended to the plan. 1ote: The typical cargo plan of a general cargo ship is shown on the opposite page. The cargo plan has a number of functions:  it helps to avert overcarriage and short delivery. 

holds in elevation 4side view5 andand other the discharge sequence can be planned in compartments such as tween decks deck advantage. lockers, in plan view. 'here possible, each  the necessary cargo handling gear parcel of cargo should be identified can be rigged in advance. separately, but this is not always possible  discharge time can be estimated. when many small parcels are involved 4in  transport arrangement for a particular which case they are grouped together5. parcel of cargo can be made.  proper decisions can be made on  typical entry on the plan could be as ventilation can be arranged with the aid of the follows: cargo plan.  9%//9#1"  in the event of a fire breaking out in the  <33 *7)7 */(1) B))& compartment, the cargo plan is invaluable in  C7(D ?;t. fighting the fire, particularly if dangerous i.e. <33 cases of corned beef, loaded at cargoes are in the compartment. 9iverpool for discharge at enang, all cases  should any cargo shift while the vessel is at marked C7(D for identification and the total sea, prompt action can be taken with the aid of weight of the parcel is ?; tones. the plan.  the plan, enables the shipowner to It is usual to colour the plan according to the port of discharge, so that the likelihood of overlooking a parcel of cargo and carrying it to the net port 4i.e. overcarriage5 is reduced. In the case of cargo having optional ports of discharge it is coloured in both port%s colours. 'here there is unused space ad$acent to stowed cargo, it is measured up, and the calculated volume measured, and entered on the plan. 8arious symbols and conventions may be used: - for eample, parcels separated by a diagonal line on a side elevation, are side by side in the hold. In addition to the actual drawing, other useful information is shown in the plan. The name of the ship, master%s name, the voyage number, cargo loaded /1 )*, in masthouses, and in various other etraneous places such as the mate %s office and the draft at the last loading port are shown in the cargo plan. It is good practice to append a statement of dangerous cargo on board for quick

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assess the position regarding to diverting the vessel enroute to load further parcels of cargo.

Cargo Plan On Tan!ers 9ike the cargo ships, the tanker cargo plan is particularly useful when a number of diverse cargoes are to be loaded. 6nlike the cargo ship, it is only necessary to show the disposition of the tanker cargoes in plan view, at one level. It is sometime the practice to overprint the comparable importance. ost of the functions of the plan are similar to that of the general cargo plan. It is particularly useful to deck officers when loading or discharging to the chief officer for planning tank cleaning and to the chief engineer for maintaining cargo temperature. The cargo plan enables a visual record to be kept of previous cargoes, which is of significant importance to the chief officer when planning the disposition of future cargoes.

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DUT/ES A.D RESPO.S/&/L/T/ES OF CARGO OFF/CERS Cargo O##iers The term H*argo /fficers% implies the person responsible for the safe and efficient handling and stowage of cargo on board. This responsibility also includes the proper preparation of the hold prior to loading, correct supervision during the working of cargoes proper to the preservation of cargo whilst in transit and the co-operation#co-ordination with relevant port authorities whilst in port#harbour. The aster to the senior most deck officer i.e. the *hief /fficer generally delegates the responsibilities of the *argo /fficer. The ?nd and ;rd /fficers, who are called the Hunior *argo /fficers%, assist the *hief /fficer in carrying out these duties.

D%ties An" Res'onsibilities The main duties and responsibilities of the *argo /fficer are listed below: 25 To ens ure the proper pre paration of all cargo spac es for the types of cargo to be carried. ?5 To inspect the sh ip%s cargo gear to ensure that it is in good working condition and in accordance with the statutory requirements. ;5 To ensure that all holds, accesses and parts of the ship comply with the requirements of the ock 7afety (egulations. <5 To ensure proper status of guardrails, manhole covers, side ports, stern doors, container fittings etc. @5 To plan and sup ervise the proper stowage of cargo on board ensuring the safety of life and property, and avoiding ecessive ship stresses whilst having adequate stability during loading and discharging and at all stages of the voyage. >5 To achieve proper stowage of cargo not in such a manner as to prevent correct and speedy discharge, taking into account the

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proper rotation of ports and also ensure that no cargo is over stowed. E5 To undertake measures to prevent the outbreak of fire on board and to ensure that fire fighting equipment is in readiness all the time. =5 To handling ensure the sa fe operation of all ship %s cargo gears. G5 To avoid damage to the cargo - to ensure the proper handling, slinging, discharging, separation, ventilation, slinging, distribution of cargo. In the case of refrigerated cargoes The proper control of temperature. 235 To take adequate measures to prevent the pilferage of cargo. 225 To maintain a daily check and record of cargo loaded or discharged including the vessel%s draught. 2?5 To make proper and correct entries into the ate%s 9og Book, issue relevant ate%s (eceipts for cargo loaded, drawing up of cargo plans, hatch lists, cargo summaries, dangerous cargo lists etc. To maintain the angerous *argo (egister. 2;5 To attempt a good distribution of cargo at loading and discharge ports, so as to obtain the fastest turn round of the vessel and minimise port stay. 2<5 To ensure that all cargo is properly secured, hatches well battened down and cargo gears secured before the vessel proceeds to sea.

1#) To ensures that proper ventilation of cargo spaces is carried out to prevent cargo damage due to temperatures condensation#sweat. check and record and */ ?To concentrations in refrigerated cargo spaces. 2>5 In the event of bad or adverse weather conditions, to ensure the water tightness of

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compartments, proper trimming of ventilators and the lashings of cargo etc. 2E5 To ensure that all work on board is carried out in accordance with the C*ode of 7afe 'orking racticesD. 2=5 To properly delegate duties to unior *argo /fficers with adequate instructions for the proper loading#discharging and stowage of cargo and the overall safety of the vessel.

Pa!aging O# "eneral cargo may be General presented forCargo shipment with various forms of packaging, such as:  Bags - made from natural fibres like $ute#cotton or from synthetic fibres and paper. 6sed for cement, grain, sugar etc. They are liable to bursting at their seams.  Catons - made from cardboard. 6sed for finished goods like condensed milk, shoes, or for carrying fruits etc. They are very fragile and liable to be crushed.  C#ests - rectangular#square boes made from plywood. 6sed for carrying tea. They are fragile and liable to be crushed.  Cases - rectangular boes made from wooden planks nailed and banded. *an be strong or fragile depending on quality of wood J construction of case. 6sed for heavier goods like spare parts etc. or to protect fragile goods.  Cates - rectangular, made from wooden planks with Hgrated% design. 1ot as strong as cases and sides are fragile. 6sed for machinery parts etc.  Bales - formed when commodities such as natural fibre, cloth etc. are pressed tightly into a rectangular bundle and then strapped firmly with metal bands or cord. 9ifting by hooking onto bands should be avoided.  Baels - made from shaped wooden planks called Hstaves% and held by metal hoops. The weakest part is the rounded middle called the Hbilge% and the strongest is at the quarter hoop%. The opening for filling the contents is called the Hbung%. Ideally placed on

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Slinging O# General Cargoes 9oading and discharging of cargo is facilitated by the use of proper cargo handling gears namely, derricks#cranes 4the lifting machines5 and slings. 7lings facilitate the Hgrouping% of unit packages of cargo conveniently for connecting to derricks # cranes. 8arious types of slings, for use with different types of general cargo, are available and are designed to minimise damage to the cargo during the lifting process. 7ome of the principle types of slings, available are clearly eplained in various tetbook.

Unitiation2Palletiation To further facilitate quicker dispatch of cargo into#out of the ship, and to allow it to be handled mechanically by machines such as forklift trucks, small packages of cargo 4unit packages5 of uniform si+e are sometimes consolidated into Hunit loads% on Hpallets% 4double-layered wooden platforms of standard dimensions capable of being lifted conveniently by fork lift trucks5. 7pecial Hpallet slings% make the slinging of pallets, onto derrick#cranes, faster and easier. The concept being to assist the process of cargo handling by reducing the number of occasions when a piece ofincreasing cargo hascargo to bethroughout. manually handled thereby

wedges, called Hquoins% placed below the quarter hoops keeping the Hbilge off the ground and the Hbung% upwards 4i.e. HBung up and bilge free%5. 6sed for carriage of wine etc. and similar produce.

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Can ,oo!s

The hook slips under the lip of the drum or barrel. There are frequently four or five sets of hooks on a ring, which enables drums and barrels to be handled very rapidly. They are not to be recommended for handling heavy barrels as there is a possibility that the staves will be pulled out.

Snotter Hre-slinging% of cargo, where slings are left on after loading so as to facilitate quicker discharge at the other end 4by avoiding the building up of sling loads again5 is a form of uniti+ation and is used on some trades.

ay be made of either rope or wire by forming an eye at each end of a 2>mm - ?3mm wire

H*ontainerisationD is a special form uniti+ation and will be discussed later.

4?Dmetres - ?.@ C54?-; or @3mm - >3mm rope It4>D ED5 fathoms5 in length. is -used slinging cases, bales, wet hides and timber.

of

&AS/C CARGO ,A.DL/.G E3U/PME.T A.D CARE OF CARGO

Plate Clam's

C*ain Sling

*onsists of a length of chain with a large ring at one end and a hook on smaller ring at the other end. It is used for lifting heavy logs, bundles of iron and most steel work. *are must always be taken that no kinks are allowed to form in the chain when goods are being lifted.

ALAM/July 2002

There are various type o plate clamps, but the principle is that the plate is gripped when the weight is taken, so that there is no chance of plate slipping as it could do if a chain sling was used.

Page 13



Ro'e Sling

This is formed by $oining the ends of a piece of ?@mm - ;3mm rope ;D - ;.@C5 about 23 to 2? metres 4@ to E fathoms5 in length with a short splice. The sling is in very common use. Bags, baled goods, barrels and cases may all be along with this.

&o4es

Cargowork

This is formed by sewing a piece of canvas between the parts of a rope sling. It is used for bagged grain, rice, coffee and similar cargoes where the contents of the bag are small. ny spillage is retained in the canvas and is not wasted. The stress on the outside bags is spread more evenly and thus the chance of splitting is reduced.

DAMAGE DUE TO /MPROPER USE OF CARGO ,A.DL/.G E3U/PME.T uch cargo damage results from careless or improper handling during the loading and discharging processes, the following being the principal sources of such damage: -

Careless 0in* 0or! 9owering heavy slings or drafts of cargo too fast on to cargo already in stowage not infrequently is responsible for damage which, often goes undetected until discharge.

Cargo ,oo!s 7imilar to the tray by a wooden side is fied around it. 6sed for handling eplosives.

Tra(s

The use of these implements is indispensable in the handling of a large variety of commodities, but with bag cargo, fine bale goods, hides, fire rolls of paper and matting, etc., light packages, liquid containers, crates and like packages whose contents are eposed or unprotected, the use of cargo hooks should be strictly prohibited.

Cro) an" Pin* &ars These also are indispensable to the sound stowage of many classes of heavy packages, but their use should never be permitted when stowing barrels, or other liquid containers, or with any packages which are not substantial enough to withstand damage from their use. ay be square, rectangular or round. They are slung by pieces of rope called legs, attached to the corners. 6sed for small cases and drums.

Canvas Sling

ALAM/July 2002

Cr%s*ing against S*i'5s Si"es !atch coamings, beam sockets, etc., should be safeguarded against by the use of overside skids, the correct plumbing and guying of derricks, and careful winch driving, especially when swinging booms are in use.

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Dragging Cargo ragging *argo by winches along the deck to save trucking, from remote ends and wings of holds and Htween decks instead of making up the CdraftD or CslingD near the hatch, is a prolific source of damage to, and loss of contents of the lighter class of packages, as well as to the cargo in stowage over which such is dragged.

Dro''ing Pa!ages ropping packages from trays, trucks, railway cars, top tiers of lighters, etc., by which their contents are broken or eposed, the packages splintered, deformed or loosened in their fastenings and rendered unfit for the subsequent handling they are sub$ected to. To avoid this, suitable skids should be used for packages, which are too heavy to be handed down.

/m'ro'er A''lianes The use of special appliances tends to be epeditious and economical in handling of cargo, but damage is frequently caused by the improper use of such appliances.

Cargowork

crushing the outside upper packages by compression of the sling. 9ight or fragile packages should not be slung along with heavy packages.

La! o# 0al!ing &oar"s 9ack of 'alking Boards and landing platforms. 'here these are not provided and used, damage is caused to packages, in towage, over which other cargo has to be worked into the position where it is to be stowed. ackages, which are damaged after they are at Cship%s riskD, should be carefully recoopered or repaired before stowing away.

S0EAT A.D +E.T/LAT/O. +) ,E.T a5 C7weatD is cond ensation, which forms on all surfaces in a cargo compartment due to the inability of the cooled air in the compartment, to hold water vapour in suspension 4warm air can hold much more water vapour than cool air5.

1et slings are most useful with many kinds of small packages, but if used with bagstuff, light cases, etc., a great deal of damage results. 7imilarly chain slings are indispensable for certain types of packages and useful for most classes of iron goods, but the use of such with light cases, sheet iron, coils of lead or copper piping, sawn logs of valuable timber and other goods liable to buckling, fraying or marking by chain is productive of damage and claims. *anvas or web slings should be used for slinging bag flour, coffee and like cargo, while the use of trays for certain classes of goods is much to be preferred to slinging by net or rope.

/m'ro'er Slinging Too much weight in a draft endangers the safety of packages situated at the outside edge isofliable bottom and top tiers into which sling to be drawn by weight belowthe and compression above.  draft composed of many packages should taper off on top to prevent springing or

ALAM/July 2002

b5 7weat may be differentiated as follows:

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i5 7hip%s 7weat - eists when water droplets are deposited onto the ship%s structure in the compartment 4e.g. deckheads, beams, frames, shipside, stringers etc.5 and then fall onto or come in contact with the cargo. It occurs when the dew point of the air in the cargo compartment is more than the temperature of the outside air#structural parts of the compartment.

Cargowork

removing fumes and odours emanating from cargoes stowed in the compartment to prevent Htaint% or other damage. thus preventing fire. 



b5 8entilation may be described as either: )i T#o"g# 0entilation - with the flow of air occurring through the body of the cargo assisted by proper Htrimming% of ventilators and the $udicious use of dunnage.

It is usually found on voyages from warm places to colder places. ii5 *argo 7weat - arises when condensation forms directly on the body of cargo itself. It occurs when the temperature of the air in the compartment 4or the cargo itself5 is lower than the dew point of the incoming air. It is likely to be found on voyages from cold to warmer places. c5 revention of amage by 7weat lthough intelligent use of dunnage can minimise damage from sweat, it is more prudent to consider the prevention of damage by the elimination#minimisation of sweat by efficient ventilation. The controlling factor for the formation sweat is the relationship between the temperature and humidity of the air in#outside the compartment. ir having 233A humidity is said to be Csaturated the temperature at which this occurs is called its dew point.

i) 'hen the dew point of the outside air is lower than or equal to the dew point of the air in the compartment - 8)1TI9T). )ii 'hen the dew point of the outside air is greater than the dew point of the air in the compartment - / 1/T 8)1TI9T). ) NTIL.TIO N the main ob$ectives of: a5 0E 8entilation has  preventing moisture damage to cargo srcinating from condensation 4sweat5 within the cargo compartment.

ALAM/July 2002

)ii ,"face 0entilation - with the flow of air occurring only at the upper surface of the cargo and not being forced into the body of the cargo. c5 8entilation may be provided by two ma$or means: i) Nat"al 0entilation - this is achieved by Htrimming% the ship%s ventilators and obtaining a natural flow of air caused by the vessels movement or outside wind. Trimming the leeward ventilation into the wind and trimming the winward vents away from the wind can effect HThrough natural 8entilation%. The air in the compartment will then move in a direction contrary to the flow of outside air.

ii) Mec#anical o 1oced Da"g#t 0entilation - The simplest of such systems consists of a fan of appropriate si+e and design which delivers outside air into the compartment, and the used air from the compartment is discharged to the atmosphere via the natural ehaust ventilator.

Page 1$



7ometimes such an arrangement does not prove satisfactory and hence the ehausting is also done mechanically by means of a suitable ehaust fan. The delivery and ehaust is properly balanced to provided good airflow.

Cargowork

side frames with the distance between the Hbattens% of about ?;3mm 4GD5. *argo battens are sometimes fitted vertically and in such cases the initial epense is generally greater. !owever there tends to be less subsequent damage to the battens and better protection is afforded to the cargo.

The tank top is usually covered with a double layer of non-permanent dunnage called Hportable dunnage%. The bottom layer consists of @3mm  @3mm 4?D  ?D5 timber spaced about 3.E to 2.3 metre 4?-; feet5 apart and laid athwartships - if the ship has conventional side bilges 4otherwise laid fore-and-aft in case of Hbilge wells%5 to allow free drainage. The upper layer consists of 2@3mm  ?@mm 4>D  2D5 boards laid across the lower layer, about ?;3mm 4GD5 apart. 2) D3NN.GE unnage% may be referred to as the wood that is used to protect cargo. It may be in the form of wooden planks, or slats, bamboo, bamboo or rush mats.

In some ships the tank top, in way of the hatch, is protected from impact damage by cargo by a permanent wooden sheating called the Htank top ceiling%. This does not replace dunnage and the portable dunnage should be laid over this and it should also etend over limber boards. 7imilar dunnage arrangements will be found in the tween decks, however the lower layer of portable dunnage may also consist of 2@3mm  ?@mm boards 4sometimes only a single layer is used5. articular attention should be paid at the shipside stringer, where a thicker layer of portable dunnage may be prudent, as water tends to accumulate here.

any general cargo ships have permanent dunnage, called Hspar ceiling% or Hcargo battens%, fitted over the side frames in the hold 4and sometimes over the bulkhead stiffeners5. It consists of 2@3mm  @3mm 4>D  ?D5 timber usually fitted hori+ontally into cleats over the

ALAM/July 2002

Timber used for dunnage should be clean, dry, stain free, odour free and free from nails and large splinters. 1ew timber should be free from resin and the strong smell of new wood.

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Cargowork

'ith some cargoes such as bagged rice etc, the hold pillars should be lagged with bamboo mats. 'hen battens are not fitted on bulkhead stiffeners, a lattice of bamboos may have to be erected as a temporary measure.

These definitions include pump rooms on tankers. There may be special instructions for routine entry into pump rooms on your ship. ake sure you know what they are.

It must be noted that dunnage need not be laid if the cargo does not require ventilation. &or eample, when coal is loaded in bulk, the cargo battens are removed and no portable dunnage is laid.

.N ENCLO,ED ,!.CE ,$O3LD NE0ER BE ENTERED 3NLE,, .3T$ORIT4 $., BEEN GI0EN B4 T$E M.,TER OR . RE,!ON,IBLE O11ICER

The use of dunnage be summarised  reventing cargo may coming into contact as: with free moisture#water on the tween deck or tank top.  reventing cargo from coming into contact with the steel boundary of the hold thus minimising damage due to Hship%s sweat%.  ssisting in providing ventilation, thus preventing # reducing Hsweat%.  reventing spontaneous heating by affording good ventilation.  iding distribution of weight over a layer of cargo thus minimising crushing damage to cargo.  reventing chafage between cargoes.  *ertain types can prevent pilferage of cargo.  iding in distribution of cargo weight over

The atmosphere in any enclosed space may be incapable of supporting human life. It may contain flammable or toic gases or not enough oygen.

tank top etc.  *an be used to separate cargoes 4this is not considered as a normal practice5.

Entr( /nto Enlose" S'aes There are many enclosed spaces on a ship - if in doubt about any space you may have to enter *!)* &I(7T with *hief /fficer.

An Enlose" S'ae /s any space or compartment that has been closed or unventilated for some time.  any space or compartment that may, because of the cargo carried, contain noious, flammable or harmful gases.  any space or compartment which may be contaminated by cargo or gases leaking 

through a bulkhead or pipeline.  any storeroom or space containing noious or harmful materials  any space or compartment which may be deficient in oygen.

ALAM/July 2002

This is why it is essential that the aster or officer in charge, who will ensure that all the necessary safety precautions have been taken before anyone is allowed to enter an enclosed space, must give instructions or permission.

Prea%tions &e#ore Entering Tan!s Or Con#ine" S'aes 25 rior to entry into enclosed spa ce it is essential to obtain permission first. ?5 Test on tank atmosphere - should be checked by using eplosimeter and oygen analyser where appropriate for safe entry. ;5 8entilate space prior to entry and continuously during the operation so as to ensure the environment is safe. <5 )ntry should be res tricted to the min imum number of personnel required for the $ob and a record is made on the number of personnel. @5 dequate lighting to be pro vided for the entry. >5 roperly attired and safe ty gear should be observed by all personnel involved in the entry into enclosed spaces. E5 6se only intrinsically safe equipment when the enclosed space was used to store or carry flammable cargoes prior to the entry. =5 ost signs at entrance and one competent man on standby to monitor the operation. G5 roper between and effective established all partiescommunication involved in the entry. 235 )mergency procedures and evacuation should be briefed and well understood to all personnel involved.

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Cargowork

?5 escribe ship sweat and ca rgo sweat and the factor affecting sweat.

Assignment lease complete the assignment and return to 9 25 7tate the fun ctions of a cargo plan in a bulk carrier.

ALAM/July 2002

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Cargowork

MODULE 6 - CO.+E.T/O.AL DERR/C7 R/GS T*e Single S)inging Derri!

The single derrick rig is basically a boom supported at its base 4heel5 by a special pivotal allo arrangement theorHgoose neck%, which ws it to becalled raised lowered by means of a Htopping lift span% and to be swung from side to side by means of Hslewing guys%. 1ear the head of the derrick boom is the Hspider band% onto which are attached the Hderrick head span block%, the Hslewing guy pendants% and the Hcargo head block%. The topping lift span, downhaul 4the hauling part5 is led via the Hmast head span block% on to a Hdolly winch% usually fitted with its own motor for the sole purpose of raising#lowering the derri ck boom 4in order ships the daily winch may have no motive power of it%s own and is turned by using a Hbull wire% onto the side drum of the cargo winch.  safety device in the form of a Hpawl% is fitted to the dolly winch to prevent the accidental lowering of the derrick boom.

ALAM/July 2002

The Hcargo runner% downhaul is led from the Hcargo head block% to the cargo winch via the Hderrick heel block% and usually passes through a Hrunner guide% on the boom, which prevents the runner from sagging. The slewing guys 4fitted on each side of the boom5 which have their wire pendants shackled to the spider band at the derrick head have their lower parts consisting of a cordage tackle for hauling on. The single derrick rig can be used to lift loads to the full etent of it%s 7'9 4safe working load5, which is marked near the heel of the boom, provided the cargo runner 4or cargo purchase5 is also rated to that 7'9. NOTE: When a single derrick is used in the Union Purchase rig, a ‘preventer guy’ is passed over its head on the outoard side.  single swinging derrick which converts a single whip to a double whip and creates a mechanical advantage. 6sed to lift load double of the 7'9 of the cargo runner 4The derrick must be rated higher5.

Page 20



YO-YO Gear )mployed using two or four single derrick s. 6sed for loads heavier than those, which can be handled by the union purchase or single swinging derrick.

T)o Derri!s The two inshore derricks are rigged with a gun tackle and their moving blocks are $oined by a heavy strop supporting a floating block 4K/K/5 with the cargo hook attached. /peration is carried out by swinging both derricks towards the hatch#quayside, keeping both derricks heads as close together as possible.

Fo%r Derri!s Two pairs of derricks are rigged similar to the union purchase. The two cargo runners of the inboard derricks are passed through a floating block and shackled together0 similarly the outboard derrick runners are passed through another floating block and shackled together. The floating blocks are then shackled together to form the union with the cargo hook secured below them.

DERR/C7 R/GS Union P%r*ase S(stem

Cargowork

a union hook and worked in con$unction with each other. Refe to fig5 . . )ach cargo boom is $oined to the vertical mast or post by a swivel fitting known as a goose neck 4so named because of the shape of the fitting5. Then up and down, or luffing, movement as the boom is carried out by a topping lift#span tackle, and the hori+ontal or athwartships movement is controlled by a slewing guy attached to the outboard side of the boom head. The two booms are linked by a schooner guy which runs from the inboard side of toone head to the other and thence the boom deck via a lead block on the mast. Inboard slewing guys sometimes replace the schooner guy but the latter tend to interfere with the cargo-working operation. The schooner guy is always well clear of the cargo working area. The guys and tackles position the derricks. /ne boom is positioned over the hatch and the other boom is positioned over the ship%s side. 'hen the booms are set up in position the preventer guys are set up tight. These are single lengths of wire which lead from the outboard side of the boom to the deck and which have the function of taking the guy load during the cargo-handling operation. The preventer guy is sometimes called the standing guy as it has no moving parts whereas the slewing guy consists of a tackle 4usually the only tackle on board ship rigged to advantage5.  cargo wire, or runner, from each boom is $oined by a three-way swivel which is known as a union hook. In the unloading process the boom centred over the hold lifts the load by its runner. /nce the loadline has been lifted to a sufficient height to clear deck obstructions, the cargo runner from the other derrick is used to move the load over the ship%s side and on the quay or into a lighter.

&ig.  - 6nion purchase rig !sle"ing guys not sho"n# This is probably the most common derrick system in use on general cargo vessels. Two derricks are CcoupledD, CmarriedD, or $oined by

ALAM/July 2002

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Cargowork

load, by the topping lift span led to a separate winch, and it can be swung from side to side 4slewed5 by Hsiean guys% or either side led to separate winches. In view of the greater 7'9, the topping lift span0 the cargo fall and the steam guys are all multiple-fold purchases. &urther the cargo purchase and the topping lift purchase are rigged advantage 4by use or additional Hlead% sheaves5. In view of rig, the great heavycare loads involved for and the si+e of the is required setting it up 4which may take up to ? - ; hours5.

PATE.T DERR/C7S &asi C*arateristis Prea%tions The following criteria must be complied with at all times: 5a The minimum operating angle of eith er derrick should be not less than 2@L to the hori+ontal, and it is recommended that the angle be not less than ;3L0 5b The maimum included angle between the cargo runners must not eceed 2?3L0 5c The outreach beyond the mids hip breadth of the ship should not less than
Disa"vantages a5 It ca n only be used for light loads, an average of approimately 2.@ - ? tonnes per load. b5 The winchmen must be hig hly skilled and eperienced. c5 The derricks cannot be used for Cspot loadingD. d5 (e-positioning the derricks is time-

i5 The twin top ping lif t#slewing guy principle is used which gives good control of a single derrick. ii5 The capability of handling heavier loads than the union purchase system. iii5 *ombined slewing and topping 4luffing5 tackles. iv5 8ery good spo t loading facilities. i.e. the load can be set down in most positions within the hatch area. v5  high degbeing ree ofconducted cen trali+ed with the operation by control one man. vi5 The derrick is rig ged at all time s and can quickly be brought into operation. vii5 The use of new technology reduces the stresses encountered with the union purchase system. There are many patent derrick systems used on board ship but the best known are probably C!allenD and C8elleD for the handling of general cargoes and C7tuelckenD for heavy lifts.

consuming.

T*e 8%mbo Derri! This is basically a single swinging derrick with a much greater 7'9 4about ;3 - @3 tonnes5. The boom can be raised or lowered, with the

ALAM/July 2002

Page 22



,allen Derri!

Cargowork

when swung out over the ship%s side to an angle of =3L from the fore and aft line. The  frame also helped to keep the derrick stable in all positions, even when the vessel had a list. !owever, under some operational conditions there were disadvantages when using the  frame: 25 'hen the derrick was swung outboard, the sharp angle created by the conta ct of the topping lift guy pennant with the frame caused ecessive strain in the topping lift. ?5 There was a tendency fro the sin gle-wire pennant onframe the topping to slip at above or below the when lift working CdifficultD angles, once again putting ecessive strain on the topping lift. ;5 The contact with the frame caused chafing on the pennant. This was reduced by fitting rollers to the frame or by protecting the wire.

The !allen swinging derrick employs the twin topping principle which allows good control of a single derrick. This derrick was originally designed for loads of @ - = tonnes but loads of over 233 tonnes are now uneceptional. The derrick can be mounted on all types of mast or derrick post and can make a traverse from port to starboard of 2>3 - 2=3L.

The  frame has been largely replaced by outrigger rods. 4fig. ;5 which are pivoted, and are stayed on the outboard side only so that the rod nearest the discharging side can swing towards the ship%s side, thus ensuring a wide separation angle of the topping lifts. s with other patent derricks, such as 8elle and 7tuelcken, the 8-shape arrangement of the topping lifts gives a broad base which is necessary for lateral holding and guiding of the derrick. In figure ; the broad base between the topping lifts is provided by a cross-tree at the mast head. It could also be provided by derrick posts, gate masts, or 8 masts. In the !allen system each topping lifts runs to its own winch. !auling on both winches tops the derrick, and if one winch hauls in while the others pay out, the derrick slews to the side of the ship on which the hauling winch is located. a third winch is used for hoisting and lowering the cargo. The derrick is controlled by two levers. /ne lever operates the cargo, purchase and the othe r lever has a multiposition control for the topping and slewing operation.

In thefitted srcinal design fied was to the masta 4as in frame fig. B5 CoutriggerD which was commonly known as a CD frame. This had the effect of keeping the topping lifts at a sufficiently wide angle to one another to ensure the derrick remaining steady even

ALAM/July 2002

+elle Derri! The 8elle swinging derrick also uses three winches. The cargo purchase is operated by a standard type winch but the topping lifts are arranged so that one of the other two winches

Page 23



controls the luffing while the third winch is used solely for slewing. )ach of the topping lift winches has a split or divided barrel on to which the ends of falls are secured. /n the luffing winch the falls are laid on to the split barrels in the same direction. Thus both falls will hoist or lower the derrick simultaneously. /n the slewing winch the falls are laid on to the split barrels in opposite directions. Thus when the barrels rotate, one fall pays out while the other heaves in and the derricks slews to port or starboard. The topping lift luffing and slewing are operated a multiposition winches control lever which isbypositioned ad$acent to the cargo purchase control lever. The operator stands between the levers and operates the cargo purchase with his left hand and controls the derrick movements with his right hand. &igure * shows a plan view of an early version of the 8elle derrick in which a bridle bar was used to spread the topping lift spans at the derrick head. The bridle bar evolved into the CTD- shaped derrick head shown in &igure @. Both arrangements make very wide slewing angles possible due to the good lateral stability achieved by the spread of the spans at the derrick head. The derrick can be swung outboard until it is almost perpendicular to the ship%s side, even with an adverse list.

Cargowork

;5 *ontact with frame cause chafing. (educe by fitting rollers.

T)o Levers 25 /ne operates the cargo. ?5 /ther 4multi-position5 for topping J slewing position.

S,/PS CARGO DEC7 CRA.ES 7ome modern ships are fitted with cranes instead of derricks. Basically they are provided with individual electrical driven motors to permit lifting of the HIB%, slewing of the $ib and the working of the cargo hoist. The HIB% is a pro$ecting hinged arm and is usually of the luffing type which allows it to ensures hat the hook carrying the weight remains at the same level. The lifting wire rope is rigged usually as a single whip. It leads over a sheave at the head of the $ib and is called the purchase. Between the purchase and the hook is a weight called the Hpon der ball%. Its func tion is to help the purchase to over-haul when there is no load. The crane may be set to move on rails the ship or along the ship or may be fied centrally with a large reach and angle of slew.

*ranes offer the following advantages: endulous swinging of the load has been a  greater Hspotting area% particularly when ma$or problem with derricks in which the load installed on the vessel centre line, providing hangs a Csingle pointsD. "ood load greater fleibility. stabili+ation is achieved with the T-shaped  faster loading#discharging rate. derrick head as the spread of the cargo runner  less time in preparing for operations. reduces pendulous swinging and load rotation.  decks clear of guys, stays and other standing#running riggings. The 8elle derrick is noted for its comparatively  self contained and easier to operate. simple design, reliability, and versatility. The standard designs operate up to a capacity of The main disadvantages of the crane are its approimately ;@ tonnes but heavy-duty higher initial cost and the possible pendulous designs are capable of lifting approimately swinging of the load when slewing is done in a 233 tonnes. fast manner.

Disa"vantages o# 9D5 #rame 25 'hen swung outboard, sharp angles created by topping guy with frame cause ecess strain in topping guy. ?5 t difficult angles single topping pennant to slip above or below CD frame - ecessive strain.

ALAM/July 2002

Derri! Testing 7hip%s derricks are initially tested 4initial test5 with the boom at an angle of not more than 2@L to the hori+ontal or, if this is impracticable, ;3L.

Page 2!



uring its working life, it is recommended that the derrick be retested after any repair to the derrick or permanent fittings, or after any alteration of the rig is not covered by the ship%s plan. 'hen carrying out a test, the ecks (egulations, form GG should be consulted, to ascertain whether the accessory gear complies with the statutory requirements. If all is in order, the test may be carried out0 otherwise, all loose gear, blocks, shackles,

Cargowork

is parallel to the boom, the safe working load marked on the upper block in the purchase should be greater than that marked on the lower block. This takes into account the increased resultant load due to the tension in the hauling part of the purchase. Before applying a proof load to the derrick, all permanent attachments on the mast and derrick should be carefully eamined. It is also good practice to rig an adequate preventer span wire rope as a precautionary

etc., shouldinbeaccordance sent to works for the the necessary against any of the span treatment with statutory measure Hcarrying away%. Thispart additional span gear wire requirements laid down in form GG. rope should not take the mass of the mass of the derrick during test. The safe working load of the derrick Has rigged% should be checked by reference to the 'hen proceeding with the test, the proof load individual safe working loads of the blocks and should be applied steadily, and all fittings shackles in the rig, either by direct calculation, should be carefully watched for any indication or by the preparation of load diagrams. The of failure. part from watching, it is also strength of the wire ropes in the cargo and desirable to Hlisten% for any signs of failure. span purchases should also the checked for the required factor of safety. 'hen testing heavy-lift derricks, care should be taken to ensure that the anchorage for the If any items of gear are found to be of test clock is of adequate strength, avoiding insufficient strength, either they should be any risk of structural damage to the ship. &or replaced by gear of the appropriate si+e and derricks of ;3 t safe working load and over, it strength, or the safe working load of the is advisable to lift moving loads or use a derrick reduced. specially designed anchorage on the vessel, Tests are generally carried out by the use of loads 4known as a Hdead load test%50 or by the use of a dynamometer 4test clock5. It is preferable that the Hinitial test% be carried out by Hdead load%. If no particular derrick a single whip is normally used but the derrick boom and span gear are capable of supporting a cargo load greater than that which may be lifted by a single whip, a proof load may be applied with the carg o runner double up at the derri ck head, provided that the ship%s blocks and shackles are used for the test. 'here it is found necessary to use the doubling-up method 4i.e. a gun-tackle rig5, this should be stated on the certificate of test, also the safe working load that may be lifted on a single whip.

and to ensure that there is sufficient stability to avoid ecessive list un der test. It is also important that shrouds and preventers are properly set up to give adequate support to the mast. &urthermore, slewing guys should be so placed that the angle they make with the derrick boom is not unduly narrow, so that when the vessel heels over under load, they will control the derrick without developing ecessive tension. /n completion of the test, a final visual eamination of all parts of the derrick rig, and of all permanent attachments on the mast and derrick, should be made before issuing the certificate of test and eamination.

In all cases the winches should be carefully eamined to ensure that they are in good working order, and that the controls act effectively. Information to this effect should be 'hen a derrick is rigged with a cargo noted on the certificate of test and purchase, and the hauling part of the purchase eamination.

ALAM/July 2002

Page 2#



)very derrick boom should be clearly marked with its safe working load.  certificate of test for this safe working load is required for the derrick Has rigged%, and further certificates of test are required for the individual blocks and shackles in the rig, including such items as guy blocks, chain stoppers, etc. The appropriate statutory forms should be used. In the case of wire ropes, a breaking load test 4form =E5 is required.  copy of the ocks (egulations, form GG, containing all copies the prescribed particulars, together with of all the appropriate certificates should be kept on board.

DOC7 REGULAT/O.S S%mmar( pply to the process of loading, unloading, moving and handling goods on any wharf, quay or ship.

Part 1: Sa#et( Meas%res At Do!; 0*ar# An" 3%a(s 25 &encing. !eight of fence not less than ?% 3>D 43.E>m5. ?5 97 in readiness at wharf or quay. ;5 )fficient lighting. <5 &irst aid boes, ambulance facilities whereabouts indicated by notices.

Part : Aess To An" From S*i' An" Part O# T*e S*i's longside quay: ccommodation ladder properly secured ??D wide, fence each side to height of ?% 3GD.  longside other ship  7afe means of access, provided by vessel with the higher freeboard.  ccess to holds etc  pplies where hold depth eceeds @ ft.  9adders in line  9adders provide foothold to depth of not less than
ALAM/July 2002

Cargowork

ll beams used for hatch covering to have suitable gear for lifting on#off without persons having to go upon them to ad$ust. ll hatch covers to be marked to indicate deck, hatch and position unless covers are interchangeable.  dequate handgrips on hatchcovers. 'orking space around hatch at least ? ft.

Part 6: Tests Et: O# Li#ting Ma*iner( ll lifting machinery to be tested before being brought into use and eamined by a competent person.  ll derricks and attachments to masts and deck must be inspected every 2? month and thoroughly eamined every < years. /ther lifting machinery thoroughly eamined at least every 2? months. 4Through eamination F visual eamination and hammer test or similar dismantling if necessary5.  *hains, rings, hooks, shackles, swivels and pulley blocks used in lifting and lowering must be tested and eamined before being brought into use.  nnealing or similar treatment - M C or smaller at least every > months, other at least every 2? months.4Thorough eamination F visual eamination and hammer test or similar 

dismantling necessary5.  "ears toifbe inspected

before use, unless previously inspected within last ; months.  (opes to be of suitable quality and free from obvious defect.  'ire rope to be tested before being brought into use, inspected every ; months and if any wire in the rope is broken, every month. If number of broken wires in a length of = diameters eceeds 23A of total wire in the rope, it must not be used, nor if it shows signs of ecessive wear or corrosion.  7'9 to be marked on blocks and on ring attached to chain sling.  *hain#'ire slings not to be shortened by tying knots in them.  achinery to be securely fenced.  7afe access and fencing to crane cabs and driver%s platform.  7'9 is to be marked on derricks and cranes.  )haust steam not to obscure any part of deck or access.

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ethod of preventing foot of derrick being lifted out of socket.

Cargowork



Part <: Misellaneo%s R%les eans of escape from hold or tween deck where coal or bulk cargo is being worked.  1o winch drivers or signalmen under 2> allowed.  'alking space around cargo stacked on quay.  If hold depth eceeds @ ft. it must be fenced to height of ;ft unless coaming is ?% 

3>D.  If working cargo in T# at least one section of hatches to be in place.  7ignaller to be employed.

ALAM/July 2002

Part = 1o person to interfere with gear, etc. unless authorised.  /nly authorised access to be used.  1o person to go upon beams to ad$ust them. 

Part > If shipowner fails to comply with safe access regulations the duty to do so falls on employer of the persons employed.  (egister to be kept available for inspection. 

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DOC7 REGULAT/O.S - TESTS A.D E?AM/.AT/O.S Ever( )in* an" all aessories t*ereto Test - roof load in ecess of 7'9 as follows: 7'9 less then ?3 Tons - ?@A in ecess  7'9 ?3 - @3 Tons - 7'9 N @ Tons  7'9 over @3 Tons - 23A in ecess ethod - )ither weights or spring#hydraulic balance. 4K1/)T)(5.

Ever( rane2"erri! an" all aessories t*ereto Test - s above ethod - 'eights swung as far as possible each way and for crane with variable $ib at maimum and minimum radii as well. erricks to be positioned at lowest working angle.

Loose Gear 0*et*er Aessor( Or .ot Test - roof load as follows: *hain, ring, hook, shackle or shivel - ?  7'9 7ingle sheave blocks - <  7'9 ultiple sheave blocks: 7'9 less than ?3 Tons - ?  7'9 7'9 ?3 - <3 Tons - 7'9 N ?3 Tons 7'9 over <3 tons - 2M  7'9

)stimates of the stresses involved may be made by resolution of Hparallelograms of forces% and in some cases by use of empirical formulae. +) In t#e ,ingle ,6inging Deic The main areas of stresses, when lifting a load by single derrick would be: part a5 athe stress on the hauling of the cargo runner#tackle. b5 the resultant load on the cargo head block. c5 the tension in the topping lift span. d5 the resultant thrust on the derrick. e5 the resultant load on the heel block. f5 the resultant load on th e mast head span block. 8arious factors are considered when making estimates of derrick stresses, and for a basic understanding, an eample is eplained with the rig parameters given below: C single swinging derrick boom, 2>m long and weighing 2 tonne, makes an angle of >3 ° to the hori+ontal when suspended by a single span topping lift with the mast head span block secured 2;m above the heel.

 load of @ tonnes is to be lifted using a guntackle rigged to disadvantage, secured at the derrick head, with its hauling part led parallel to the derrick to the winch via a heel block. )amination - fter test of all gear, including The heel of the derrick is ;m above the deck, dismantling of blocks to see that no damage or and the winch point is ;m from the mast and deformation has occurred. ?m above the deck. The lifting gun tackle itself weighs 3.? tonnesD.

0ire Ro'es

Test - 7ample tested to destruction. 7'9 not to eceed 2#@th of breaking load.

STRESSES /. DERR/C7 R/GS To avoid the possibility of accidental failure 4breakdown5 of derrick rigs, due to overloading, it is essential to know the stresses likely to be eperienced by the various parts of the rig when lifting a load.

ALAM/July 2002

a) Esti%ating t#e ,tess on t#e $a"ling pat of t#e Lifting Tacle This is obtained using the formula: n' '+ 7F 23

: 'here 7 F stress on the hauling part ' F load to be lifted

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n F number of sheaves in the system including  the weight of the lifting tackle suspended lead sheaves from the derrick head  F theoretical ower "ained 4..5  part of the weight of the derrick boom 4it is usual to take this as M the weight of the 4a Hfrictional allowance% of 2#23 of the load, for boom5. n' every sheave, is normally used hence s given in the figure, this is resolved by 23 etending the vector * 4representing the load to be lifted5 by a scaled amount *) equal Therefore in the eample: to the sum of the weight of the lifting tackle 4? × @5 @+ and M the boom weight 43.? N 3.@ F 3.E 7F 23 tonnes in this eample5 and drawing )& ? .. of "untackle F ? 4disadvantage5 parallel )&"5. to the topping lift span 4parallelogram >3 2 × 23 ? 1o. of 7heaves F ? F ; tonnes

F

NOTE7 If a single cago "nne (single 6#ip) 6as "sed fo lifting& instead of t#e g"n-tacle& t#e stess on t#e #a"ling pat 6o"ld #a*e 'een +/+8 of t#e load %oe t#an t#e load itself - allo6ing fo fiction in t#e cago #ead 'loc5 ') Esti%ating t#e Res"ltant Load on t#e Cago $ead Bloc The final load on the cargo head block is a result of:  the forces eerted by the suspended load, and  the stress on the hauling part of the cargo runner#tackle. In the figure, the Hparallelogram of forces% B* is resolved using the scaled values of the load B 4@ tonnes in this case5 and the calculated stress on the hauling part  4; tonnes as determined by the formula5.

The tension in the topping lift span is then represented by the scale value &) 4;.< tonnes in this case5. d) Esti%ating t#e T#"st on t#e Deic The forces which produce the thrust on the derrick boom are:  the tension in the topping lift span  the resultant load on the cargo head block This is represented by the scaled value of &, which is equal to  N & 423 tonnes in the case5. e) Esti%ating t#e Res "ltant Loa d on t#e $eel Bloc The final load on the heel block results from the stresses in:  the cargo runner, acting in the direction of the cargo head block, and  the cargo runner, acting in the direction of the winch

In the eample, the stress in the direction of the cargo head block is ; tonnes 4as determined in para 24a55 whilst the stress in the direction of the winch would be ;.; tonnes The resultant force at H% represented by the 4allowing for 2#23 of the load for friction in the scaled value of *, is the resultant load on the heel block - using the empirical formula for cargo head block 4equals E.= tonnes in this stress on the hauling part with three sheaves5. eample5. The forces are then resolved using the c) Esti%ating t# e Ten sion in t#e Top ping Hparallelogram of forces% 'OKP, where OK F Lift ,pan scaled value of stress towards the derrick The tension in the topping lift span results head and O' F scaled value of stress towards from the combined effects of: the winch.  weight of the load being lifted

ALAM/July 2002

Page 2'



The resultant load on the heel block is represented by the scaled value of OP. f) Esti%ating t#e Res"ltant Load on t#e Mast $ead ,pan Bloc The final load on the mast head span block results from:  the tension in the topping lift span and  the stress on the hauling part of the topping lift towards the dolly winch In the eample, the tension in the topping lift span is ;.
ALAM/July 2002

Cargowork

Assignment lease complete the assignment and return to 9 25 )plain the advantages and disadvantages of a union purchase in cargo operation. ?5  derrick ?< m long is supported by a span 2? m long. ttached to a point on the mast ?3 m vertically above the heel of the derrick a guntackle is rove to disadvantage is used to lift a weight of 23 tonnes. 7pan tackle also a guntackle is rove to disadvantage. The mass of the boom is ? tonnes and the mass of cargo gear is 3.@ tonnes. &ind the stress on: i5 errick head purchase block shackle. ii5 errick heel block shackle iii5 The load on the mast head span block shackle iv5 The thrust on the derrick 4fter leaving the heel block runner makes an angle of >33 with mast5

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MODULE < - ROLL O.2ROLL OFF SYSTEMS (o#(o vessels promote wide and comprehensive forms of unit carriage, from palleti+ation on basic form to heavy vehicular traffic, including containers. echani+ation is highly developed with mobile forms of handling continually increasing in adaptability, and ship design forms provide for entry and eit of cargoes in a variety of fashions. /ne of the most important economical aspects of these types of vessels is the quick turn around. (o#(o vessels now operate with either or a combination of bow, stern, quarter or slewing ramps, which increase their versatility. (elated to these forms of ship construction are interesting facts concerning the ship to shore interface. !eights, slope, inclination and overall dimensions also take into account the types of cargoes likely to be handled. There are some ramps 4link spans5 which can service double decks.

Sto)age any (o-(o vessels have a predominance of the weight 4e.g. ramp systems5 aft. This may require that tanks are used to maintain an acceptable trim during loading operations, and may also require that cargo is first in and last out - to the forward lower decks. *argo may be taken on board the (o-(o vessel in one or more of the following ways: a5 road vehicles with integral haulage power which will also remain with the vessel. b5 road trailers which will remain with the ship throughout the sea transport leg. c5 roll trailers which are not su itable for road haulage but which will remain with the ship during sea transport. d5 cargo towed on boa rd using roll trailers, and then cargo removed and stowed without its wheels. e5 cargo secured on flats and carried on board wither using roll trailers or by other mechanical handling equipment0 both the flat and its cargo being stowed as a unit. f5 pallets either singly or in groups carried on board using roll trailers or fork lifts trucks. g5 individual items of carg o brought on boar d by fork lift trucks.

ALAM/July 2002

8ehicles are usually close parked in lanes of about ; metres wide. This should allow access for lashing gangs to secure each vehicle properly. *ontainers may be stowed fore and aft or athwartships, but care must be taken to ensure that suitable strengthened areas of the deck are in the way of the corner castings. Trailers may be backed up the ramp and positioned so that at the port of discharge towing vehicles may have direct access to the coupling point of each trailer, and be able to tow straight off the vessel without the need to turn around. It is important that different types of cargo e.g. containers and pallets, are properly separated to prevent the one causing damage to the other. This separation, which in many cases also provides restraint, may be by means of timber dunnages, dunnage bags, sheets of plywood or hard board, and other cargo e.g. tyres etc. 'here containers with air cooled integral refrigeration units are stowed below decks, it must be ensured that adequate ventilation can reach these containers to allow proper air cooling intoway takeof place, as well end as sufficient space, the equipment of the container, so that maintenance may be carried out and temperatures monitored. ppropriate angerous "oods regulations apply to all dangerous goods cargo. These should be segregated from other vulnerable cargoes and closely available to fire fighting provisions.

Se%ring 7ecuring of vehicles on board (o-(o vessels must be in accordance with an approved system, making full use of trestles, pedestals, deck securing points, as are recommended by the builders. 7ecuring points and appropriate trestles etc., should be used to by-pass the springing system of vehicles in order to secure them. *ontainers should be lashed and secured in accordance with an approved system, preferably to locating cones and securing pins, wire, chains, hooks and levers must be set up so as not to take undue strain and there by rack or distort the container.

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d5 ll lashings should have efficient tightening devices.

There should be a sufficient number of men who have been trained in the use of the securing equipment and in the most effective methods of securing various types of vehicles 4cargo units, so that proper lashing operations are completed before the vessel proceeds to sea. The following precautions should be taken. a5 ll vehicles should, as far as is poss ible, be stowed in a fore and aft direction with the hand brakes on and the engines in gear. ny vehicle stowed athwartships must be securely lashed. b5 The suspension units of heav y vehicles or trailers should, wherever practicable be relieved by the use of $acks, after which the vehicles and trailers should be securely lashed in their stowed position. c5 )very stowed vehicle having a road laden weight in ecess of ? tonnes which is not fully balanced, should be supported at one end by $acks, rests, trestles or table laid on friction pads and then secured by lashings at both ends and at the sides as necessary.

ALAM/July 2002

There are several variable factors which affect the number and strength of lashings needed. 7ome of them are as under: 25 The weather conditions and duration of voyage. ?5 The si+e and weight of the vehicle of cargo unit and the position of its centre of gravity. ;5 The positions of the wh eels, or tres tles, in relation to the cargo load, as this affects the fulcrum moment. position and hence the tipping <5 The position and angle at which the lashings are inclined. @5 The coefficient of friction between the various bearing surfaces. >5 The safe working load of the lashing equipment. robably the most effective method of dealing with this comple problem is to rely on eperience and past practice Q i.e. to employ lashing arrangements which have proved successful at times when very severe weather conditions have been encountered. 'here such proven lashing arrangements are available, they should be displayed, either diagrammatically or in a tabular fashion on specially prepared notice boards posted in the vehicle spaces.

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Cargowork

CO.TA/.ER/SAT/O. It is a practice of grouping loads of cargo together and stowing them in /1) container to protect and preserve them and to ensure their efficient distribution. *ontainers are C!K7I*9 *769)7D, made of steel, aluminium, plastic or wood to hold a large member of individual units for shipment. In short, they are boes usually of metal with doors and lifting points.

Its rigid in construction and its components are permanently assembled. ) Collapsi'le 1e ig#t Cont aine It can easily be dismantled and parts of which easily folded and then fitted together again.

The use of containers is international along with their construction. !ence, variations in design and applications can be epected. To standardi+ed the equipment for international use, a body known as HI1T)(1TI/19 7T1(7 /("1I7TI/1 4I7/5% has been formed. This organisation is mainly responsible for setting standards in respect of construction, durability, fitures and attachments and for methods of handling, lifting and slinging of containers. The *odes and ractices of the I7/ are issued in a publication on I7/ container standards and recommendations, which should be read and understood by all officers serving on container vessels.

9) Open Top lso of standard si+e, having no roof.

Freig*t Container ccording to I7/, a freight container is an article of transport equipment: 25 of a permanent character and ac cordingly strong enough to be suitable for repeated use0 ?5 specially designed to facilitate the carriage of goods, by one or more modes of transport, without intermediate reloading0 ;5 fitted with devices permitting its ready handling, particularly its transfer from one mode of transport to another0 <5 so de signed as to be easy to fill an d empty0 @5 having an internal volume of 2 cubic metres 4;@.; cubic feet5 or more. There are many types of containers in use throughout the world today, some of them are as shown below: +) Non-Collapsi'le 1eig#t Containe

ALAM/July 2002

2) ,ide Loade It is also of standard si+e, having one or more openings on its sides.

:) $alf $e ig#t Co ntaine It is a container having standard si+e ecept for height which is only < feet. It is used for cargoes of low stowage factor, and heavy weights like steel plates and machinery plates. The sides can be completely opened by unhinging them. The roof is generally soft, that is covered only by a canvas or plywood. It has a capacity of about <33 cubic feet. ;) Ins"lated Con taine It is of standard si+e but with internal insulation of polyurethane type fitted between a plywood lining and the outer skin. <) Refigeated These are standard si+e containers carrying refrigerated cargoes and having their own machinery for cooling. =) ,peciali>ed Containes There are so many special types of containers, used for dry bulk cargoes and chemicals in powder form. 9iquids can also be carried in these pressuri+ed tanks or liquid containers.

Stan"ar" Sie O# A Container *ontainers used in international trade constructed according to the specifications of International /rganisationsR 4I7/5. &ollowing are the standard si+es of containers: +) T6ent 1e et 3 nit (8 1 eet ? = 1eet ? = 1eet)

Page 33



This is the si+e most commonly used in the world container traffic, to facilitate carriage by sea, road or air having standard points for lashing, scurrying and lifting. *ontainers are made of steel having a capacity of about 2333 cubic feet. )ach container weighs about ? tons and can handle cargo of about ?3 tons.

Cargowork

;@3 T)6 will carry ;@3 number of standard twenty feet containers.

A"vantages Using Containers 25 7peed and economy in handling, particularly at the ports. /ne gang of twelve or thirteen men can discharge and load a fully loaded container ship in three to four days instead of a hundred men taking three to four weeks. ?5 7afety, both as regards breakages and pilferage, especially when transporting sophisticated electrical goods like radios, T8s, 8*(s etc. ;5 acking can be reduced. <5  real door-to-door service can be offered.

Disa"vantages ) T6o TE3s (98 1eet ? = 1eet ? = 1 eet)  'eight of container F ;.@ tons  *("/ *((KI1" **ITK F ;3 to ;@ tons

2) ,%all ,i>e (+8 1eet ? = 1eet ? = 1eet)

25 &inancial: assive capital outlay for the ship which is more epensive than a conventional general cargo ship. ?5 )ach ship needs three sets of con tainers, that is one at loading terminal, one on the ship and one at the dis charging terminal. n ordinary container is a very epensive item of equipment. ;5 (epairs and maintenance of containers being very epensive. (eefer containers are even more epensive to get, repair and maintain. <5 7pecial terminals will have to be constructed with epensive high speed cranes capable of lifting forty tons and more weights. @5 )pensive machines must also procured to move the containers around the terminal. >5 6nprofitable movement of empty containers produces a problem of an imbalance of trace. E5 In certain countries there are customs, documentation and legal difficulties.

4) Medi"% ,i>e (28 1eet ? 2 1eet ? = 1eet)

Design O# A Container

Carr(ing Ca'ait( O# A S*i'

*ontainer is designed and constructed as per the recommendations and specifications of the I7/. In order to make sure that a container

The container carrying capacity of a ship is indicated by how many twenty feet containers a vessel is constructed and classified to carry. It is denoted by the term T')1TK &))T )S6I89)1T 61IT 4T)65. !ence, one <3 feet container is ? T)6s.  container vessel of

ALAM/July 2002

has produced to the standards, it has to bebeen proved that itsup structural calculations are correct and that it can withstand strength testing. &or that reason, such organisations as 9loyd%s (egister, Bureau 8eritas and the merican Bureau of 7hipping, engaged in the

Page 3!



certification of containers granted on the basis of conformity to an approved type, have established regulations and procedures of a rigorous nature, mostly based on I7/ recommendations.

Cargowork

!) DOOR,7 oors may be at the ends or sides, which can be opened fully to give complete access to the cargo. (ubber strips around each door and strong bolting system ensures that the container is watertight. The frame of the door is also made of steel for strength and rigidity. &or security reasons, the bolts of the doors are sealed.

Material Use" 7teel seems to be the best basic material. It is superior in yield, tensile and sheer strength and at the same time its elasticity is of a high rank. 7teel is also cheaper. 7ome containers are of mied construction with frames and castings of steel and sides and walls of aluminium. 7ome countries are using wooden, plywood and plastic containers. &ibreglass reinforced plastic overlaid plywood containers are successfully produced. 7tainless steel containers are used for transporting specialised cargoes, like foodstuff, chemicals, liquor, wines etc. The main parts of a container are: 1) .LL,7 The container walls are not load bearing, they merely provide weather protection and security to the cargo within the container. "lass reinforced plastic, aluminium and even plywood can be used, but for a longer life of a container and to give strength and rigidity 7T))9 is the material used.

Testing .%mbering *ontainers mustAn" be eamined and tested every ?M years by *lassification 7ociety 7urveyors and a certificate issued.  small plate is also fied onto the container indicating the date of such survey.

&or identification purposes, containers carry the letters of their owners, like /*9 4/cean 2) CORNER !O,T,7 ain strength of a *ontainer 9ines5, 1/9 41eptune /rient 9ines5, container lies in its corner posts. *ontainers I7* 4alaysian International 7hipping *orp.5 are stacked si high, thus, corner posts should etc.  series of fig ures also fo llow these be strong enough to withstand these stresses. letters, which indicate the type of a container.

3) CORNER C.,TING,7 These are built into the top and bottom of each corner post and provide means of lifting and lashing a container. The top of the casting has an elongated hole for twistlocks of lifting machinery and the sides have smaller holes for lifting hooks of conventional cranes and for lashing.

ALAM/July 2002

FCL 'hen a container is completely filled with the goods from a shipper to a consignee, the container is 9/. being */1TI1)(

used

as

a

&699

LCL 'hen a container is being used by a shipper to transport goods belonging to various Page 3#



consignees, only part of a container is being utili+ed for each and every consignee in a same /(T, the container is than said to be used as 9)77 T!1  */1TI1)( 9/.

CO.TA/.ER +ESSEL DES/G. The main ob$ect in the design of container ships is to carry the maimum number of containers within the designed length and breadth having regard to the form and structural arrangement. dequate structural strength must therefore, be provided.

Framing 9/1"IT6I19 framing throughout the main body of the vessel. T(178)(7) framing in the forepart and afterpart of the vessel.

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De! *ontainers are also carried on deck resulting in high deck loading. Thus, the deck and hatch covers must be strengthened to withstand this etra loading.

G%i"es The container guides and ad$acent structures are designed to withstand dynamic forces due to rolling, pitching and heaving. The guides consist of angle bars approimately 2@3 mm  2@3 mm  2< mm connected to the vertical webs and ad$oining structure and are spaced ?.>3 metres apart. The bottom of the guides are bolted to brackets and welded to the tank top and beams. These brackets are welded to doubling plates about 2@ mm thick which are welded to the tank top.

Gir"ers *ontainer vessels are built having *)9969( construction at the sides, strong longitudinal bo girders are formed, port and starboard side, by the upper deck, second deck, top of shell plating and top of the longitudinal bulkheads. !igh tensile steels are used in the upper deck and strake to form a strong bo girder. These bo girders in addition to providing longitudinal strength provide stiffness against racking stresses as well as being useful tank spaces.

,at*)a( !atchway is divided into three sections and two long hatch girders are fitted. These girders are continuous, so that the longitudinal Container Cells bending strength is shared throughout the The individual container cell is formed by four length of the girders and also provide vertical guides located at each corner of the additional section modulus. container stack running from the hatch coming down to the tank top. The guides have three ,at*es related functions which are as follows: !atches or container spaces are suited for the a5 To guide the containers down to their standard si+e of container 4?3 feet or <3 feet stowed position even though the vessel may units5.  form of bulkhead is fitted at interclass be listing or the crane not perfectly centered of 2<.E3 metres 4<=.? feet5, center to center over the cell. with watertight bulkheads as per the b5 To land any container on top of the *lassification 7ociety (ules and container below it within prescribed tolerances 7pecifications. These bulkheads resist racking so that the superimposed loads on these lower stresses, giving support to the double bottom containers do not eceed the peculiarities for structure. which they are designed. c5 To hold the containers in their stacked position and absorb the hori+ontal forces

ALAM/July 2002

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imposed on them by the containers due to the motion of the vessel in the sea. *ontainers are $ust 9I&T)-/1 and#or 9I&T)-/&&.

TYPES OF CO.TA/.ER S,/PS *ontainer ships can be divided into following categories: -

+) 1"ll C ontaine , #ips These are ships with special features and arrangements to carry only containers in all available spaces. !ence, they are generally 7I1"9)-6(/7) ships. These singlepurpose ships only move containers, stacked on top of each other in vertical stacks on deck. 9oading is achieved by lowering the container into a cell or stack, vert ically to its stow ed position without in the hori+ontal plane. further uring shifting discharge, the reverse procedure is followed. The containers can be stacked on deck up to four high. This etends the carrying ability of a ship beyond the confines of the hull and lessen the cubic losses sustained by the squaring off of the ship%s hold. The limiting forces here are the ship%s stability and satisfactory means of securing the containers in place. The biggest and fastest and also the most epensive container ships are those of the 7)-91 E7 *977. They have a capacity of 23G> containers of ;@ and <3 feet, a maimum speed of ;; knots and cross the T91TI* from 1ew Kork to (otterdam in four and a half days.

ALAM/July 2002

/ther well known 7hipping *ompanies which operate all container vessels are: a5 9K7I1 I1T)(1TI/19 7!II1" */(/(TI/1 4I7*5 b5 1)T61) /(I)1T 9I1)7 41/95 c5 )(I*1 ()7I)1T 9I1)7 495 d5 e5 f5 g5 h5

67T(9I1 1TI/19 9I1)7 4195 /*)1 */1TI1)( 9I1)7 4/*95 '7I I7)1 I7! 4-9I1)75 7*1 6T*! 9I1)7 J )(I*1 )O/(T I7B(1I7)1 9I1)7 7ea 9and, 7ea Train, 7now 7hipping and 6nited 7tates 9ines.

) !atial Containe ,#ips In these ships /19K part of the vessel%s capacity is especially designed for containers. The vessels of tlantic *ontainer 9ine and *are 9ine belong to this category as they carry not only containers, but also every type of general cargo on its own wheels or tracks or on trailers. The containers are lifted-on#liftedoff, while the trailers and other rollable cargo including cars are rolled-on#rolled-off over the stern ramp and through the stern door. These multi-purpose ships employ a combination of different cargo handling systems. The ships of this category vary in si+e from 2>,@33 to less than @33 gross tonnes. The apanese 1K

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9ine pro$ected a big ship, 2<,333 dwt for the apan to ustralia rotate.

unitised as well as bulk, liquid, commodities or even heavy lift items.

a) Con*eti'le Containe ,#ips In these ships part or whole the vessel%s capacity may be used for either containers or other cargoes and embodying special features which permit their convertibility on a voyage to voyage bases. These ships are used to transport containers and cars from say Kokohama 4apan5 to !awaii, while returning with containers, sugar and molasses in bulk.

These floating units can be towed or pushed in ports and on inland waterways and hoisted aboard the mothership for transport by sea. Besides fleibility, their advantage is that they can bypass traditional berth facilities in congested ports, releasing the door-to-door water transport, further reducing cargo handling, warehousing, inventory costs, risks of loss and damages.

') Li%ited Containe ,#ips These are ships of limited container-carrying capacity in which some container handling and securing devices are installed, but otherwise they are of normal construction carrying general, bulk and liquid cargoes.

articulars of a typical 97! ship are: *((KI1" **ITK F >2 to E; lighters 9I"!T)( 7IP) 4each5 F >2 ft. > in.  ;2 ft. ? in  2; ft. ')I"!T of each lighter F <33 tonnes appro. "(/77 T/11") F ?><33 to ;G333 tonnes 9)1"T! F =2< feet B) F 233 feet 7)) F 2G to ??.@ knots

c) Con*entional ,#ips These are ships without special containers stowing or handling devices. /n these ships, container is merely treated as a larger than usual piece of cargo. It is secured and stowed by conventional means. 7uch ships could conventional general cargo ships and roll on, roll-off vessels with four steel decks below the water deck, all linked by sloping ramps. *ontainers are handled with shipborne equipment like forklifts with a side lift frame for ?3 feet containers and forks for boes, pallets and cases. These ships normally have a capacity of ?2,E33 dwt and 2,G23,333 cubic feet bale capacity. (emarkable ramps are mounted aft on starboard side, 23@ feet long, weighting 2@3 tonnes and can bear loads up to 23@ metres or less space on the quay. This hinged angled stern ramp can be continuously ad$usted to tide and draught.

SPEC/AL TYPES OF S,/PS +) Bage Caies There are two such specially designed ships which carry barges or lighters: a) L.,$ It stands for H9I"!T)( B/( 7!I%. 9ighter or barges are independently floating, universal units without the propulsive power, and loaded with cargo of very different kinds,

ALAM/July 2002

9ighters or barges are constructed of fiberglass to boost the payload and facilitate handling, as well as reducing maintenance. The ship can also be loaded with containers, as many as 2?33 units of ?3 feet.  lash ship can be filled within ?< hours with containers by means of a travelling shipboard crane of @33 tonnes capacity, supplemented by a gantry capable of lifting upto ;@ tonnes. &eeder vessels are now in use. The 1*T 4B(")7 B/( *T(15 are merely floats or rafts formed of a number of logs tied side by side some distance apart. They ferry lighters to the mother ship, which operates only a limited number of ma$or ports-of-call and reduces port turnaround times. ') ,E.BEE 9ykes 9ines is a ma$or shipping company, owning a fleet of 7)B)) ships. 7eabees are an impressive improvement on the theme of carrying standard barges on a large sea going vessel. 7eabee is a ship operating solely as a deep sea transport of pre-loaded barges having real etensions to provide service directly to the ports and other waterside loading locations. 7eabee permits all types of cargoes whether unitised, bulk, break-bulk,

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palletised, containerised, and heavy lifts. 7he can also be converted into a roll-on#roll-off vessel and can eclusively move containers. The barges which carry cargoes, are the etensions of mothership allowing the 7eabee herself to avoid the risk run by any big ship going into port and to develop the technique of discharging offshore. articulars of a typical 7eabee are: *((KI1" **ITK F 2,@33 tonnes to 2,=33 containers of standard ?3 feet. lus 2@,333 tonnes of liquid in deep 7 (/99-/1#(/99-/&& F @ tanks. kilometres of 99)K7 with a width of ?.= metres. 9)1"T! F ?E> metres B) F ;?.@ metres )')I"!T F ?E333 tonnes appro. 7)) F ?3 knots B(")7 7IP) F ?G.2 metres  23.E metres 1/. /& B(")7 F ;= each weighing =33 tonnes B9) **ITK F ;G,333 cubic feet They also have a heavy lift subversive elevator at their stern with a capacity of ?333 tonnes to load and discharge two barges at the same time. Theoretically, the complete loading or discharging operation takes about 2; hours. &rom the elevators, power operated

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equipment is that ships can call at ports which have no costly custom-built installations like gantry cranes etc.

Cranes In the ma$or ports of the world there are special */1TI1)( B)(T!7, where two kinds of cranes are used: a) !otaine Cane This is a gantry with usually /1) boom, which merely moves the containers from the ship%s hold onto flat beds of lorries and forklift trucks on the quay. This crane is employed in ma$or container ports, where large container ships arrive regularly and where storage space and marshalling yards are consequently big or situated near the quay. ') Tanstaine Cane It is a crane of the overhead travelling type, which spans a storage place or marshalling yard. It is multipurpose crane, capable of unloading ships, moving containers to their storage place, loading trucks and trains and, between the arrivals of vessel it can be employed for marshalling. Its speed is low in comparison with portainer crane. This crane is perfectly suitable for ports with moderate output.

transporters bring the lighters to and from their storage location. The main difference between the 9ash and 7eabee is the number and capacity of the barges each can transport. 9ash carries upto E; barges with a capacity of <33 tonnes each and bale space of 2@,G33 cubic feet, whereas the 7eabee carries ;> with =33 tonnes each and bale space ;G,333 cubic feet. &urthermore, 97! uses a shipboard travelling crane, whereas 7eabee employs and elevator for the mechanical handling of these lighters.

S'rea"ers

CO.TA/.ER ,A.DL/.G E3U/PME.T

)very container crane has a rectangular spreader frame with coupler latches in the corners. These twist locks enter into the top holes of a container corner castings as the spreader is lowered onto the container. 9atches are locked and unlocked electrically,

ifferent types of container cranes are used to load and unload container ships. any shipping companies started their container operations using shipboard gantry cranes. The advantage of shipboard handling

hydraulically or pneumatically. (etractable alignment arms keeps the spreader in position. I7/ (ecommendations gives the specifications of corner fittings for freight containers.

ALAM/July 2002

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For! Li#ts &ront loading or side loading fork lifts are in common use as container handling equipment.

SECUR/.G CO.TA/.ERS 'hen loading containers on deck of the full container and roll-on#roll-off vessels, separate lashing arrangements would have to be made. The problem of lashing different si+es of containers is further aggravated by different container heights and maimum permissible gross weights of various types of boes. )ach ship carries a large stock of fittings, wires, bottle screws, turnbuckles and ratchets. !ooks and chain tensioning devices secure the vehicles to an elephants% foot located in a deck flush fitting with four slots in the form of a cross, radiating from a central hole. &irst tier of container is lowered over removable stud on the hatch covers and decks and a safety metal pin inserted through corner castings and studs. The second tier is fied into the first tier by inserting single or double bridging pieces into the corner castings, or both the tiers. Inside the holds the containers are held in place by the cell guides.

(n deck urt*er las*ings o wire+ c*ains and rods are pro,ided+ tig*tened y ottle screws and turnuckles" (n some ,essels las*ing ridges are constructed"

ALAM/July 2002

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ALAM/July 2002


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DEC7 CARGOES The carriage of deck cargo - governed by 7tatutory Instrument 2G>= 1o. 23=G. 25 The vessel must have adequate stability at all stages of the voya ge. *argoes such as coke and timber can absorb upto about a third of their own weight of water. 9osses of weight such as those due to consumption of fuel, water and stores must also be considered. 6psetting moments - wind taken into account.

<5 'here the cargo is stowed on the ha tches - properly battened down, sufficient strength to take the intended cargo. @5 eck - sufficient strength for the in tended cargo. If necessary strengthened by tomming or shoring underneath. >5 eck cargo - well sec ured, protected from weather. 1ot so high as to interfere with the navigation of the ship.

?5 dequate provision for safety of crew when passing from one part of the vessel to another - a walkway has to be provided over the cargo. 'alkway not less than 2 metre in width, not less ; courses of guard rails or wires supported by stanchions intervals not more than 2.@m. The vertical opening between lowest rails or wires not to eceed ?;3mm and no opening above that shall eceed ;=3mm. ;5 7teering arrangements - effectively protected from damage. Breakdown in the main steering arrangements - emergency gear.

ALAM/July 2002

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REFR/GERATED CARGOES De#inition ny cargo that has to be loaded, maintained and#or carried at a certain temperature in order for it to reach its destination without deterioration is classed as refrigerated cargo. This includes meat, fish, poultry products, dairy products, drugs and eperimental samples.

.) Refigeation Mac# ine 25 (efrigeration machinery should be checked and tested. Brine pipes should be tested to a pressure 2M times their normal working pressure to check for any possible leaks.  close inspection must also be made of all insulation and defects rectified. Insulated ventilator plugs must be closely fitted in place

T('es O# Re#rigerate" Cargoes

and sealed with saw dust. ?5 7cuppers and other water drainage system around and near refrigeration machinery must be checked to ensure that moisture will have an easy and free access to the bilges. 3) Test */ ? etraction, generation and in$ection equipment.

25 "oods carried in fro+e n state i.e. mea ts, fish and butter0 ?5 "oods carried in chi lled stat e i.e. beef, vegetables, cheese and eggs0 ;5 "oods carried in air cool ed condition i.e. fruit.

B) !epaation Of Co%pat%ent 25 7weep and clean thoroughly with particular 1ote: rugs and eperimental samples may attention to brine pipes, insulation, bins, be fro+en or chilled. gratings, air ducts in order to remove all traces, stains and odour of previous cargo. Pro'erties O# Re#rigerate" fter cleaning these should be wiped down with a disinfectant fluid to prevent formation of Cargoes 25 (apid deterioration if proper temperatures mould there on. are not maintained during loading, voyage and ?5 Bilges sho uld be mad e dry, cle aned and ventilated in order to remove foreign matter discharging. ?5 7usceptible to tainting and moisture and odour. Brine traps should be checked and topped up to prevent cold air from entering the contact damage. bilges and free+ing them or odour from 3) )ffected by presence of */?. reaching the refrigerated compartment. ;5 7trum boes should be cleared and bilge Re$%irements For Sa#e suction tested. Trans'ort <5 *lean dunnage, lik ely to be used, meat a5 )fficient refrigeration machinery and good hooks, bars chains or any other equipment or appliances to be used for loading or stowage insulation of the compartment. b5 *areful preparation of the compartment of cargo should be placed in the compartment including cleaning, dunnaging and precooling. after they have been cleaned and sterilised. c5 )ffective system for monitoring and @5 Thermometers should be tes ted and kept maintaining specified temperature during ready and thermometer pipes, if removed, should be fitted, or etended to enable loading, transportation and discharging. recording of temperatures at the top, middle d5 7egregation of cargo. e) onitoring and control of */ ? and lower levels of the compartments. >5 ortable trunks in holds of battery concentration in the compartment, and good ventilation.

Prea%tions Relating To Trans'ortation O# Re#rigeration Cargoes ALAM/July 2002

compartments must be assembled in place. E5 The compartment should be pre-c ooled to a temperature lower than the normal carrying temperature, to allow for fluctuations during loading, ?<#<= hours before commencement of loading. Page !3



&) If lead, copper or tin ingots are also loaded in refrigerated compartments, additional precooling is necessary. *hilled compartments should be maintained at their transit temperature and fro+en compartments at 2 hours for each floor tier of ingots. G5 pproimate pre-cooling temperatures: &ro+encompartments 23 o& *hilledcompartments ?? o& pples, pears, peaches and grapes ?=o& /ranges, lemon, grape fruit ;> o& *heese <3o& 235 The pre-cooled compartment should be inspected by the appointed surveyor and certified Hfit to load% before loading can commence. C) Loading& Disc#aging& $andling 25 unnaging should be so arr anged so as to: a5 provide adequate support to the cargo, b5 ensure sufficient clearance from dec k and sides to prevent contact between cargo and the cooling pipes, air ducts, baffle plates and any water likely to condense in the compartment, c5 in the event of different temperatures being maintained in ad$oining compartments liberal use should be made of saw dust on deck dunnage on the side s and drip trays under deck head to prevent water contamination in the warmer compartment, d5 to prevent damage to bottom tiers by over stowed cargo, e5 to permit unobstructed circulation of cooled air below, around and through the cargo including dunnaging at intermediate tiers for cargo of tight block stow type so that uniform temperature can be maintained throughout the compartment. ?5 *argo tendered for shipment should be inspected thoroughly: a5 fro+en cargo should be hard fro+ en and free of spots or mould. There should be no blood stains on the wrappings, b5 fruit should not be in advanced stated of ripeness, skin should not be discoloured and should not be brown on the inside. (andom samples should be taken and cut open. ;5 *ooling in compartment opened for loading should be stopped to prevent frosting of grid pipes which will not only reduce cooling

ALAM/July 2002

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efficiency but on melting will result in water accumulation in the compartment and possible damage to cargo there in. ny snow formation on pipes should be carefully swept off. <5 *ompartments not being worked should be kept closed. If necessary to keep them open to permit loading in ad$oining hold or space, escape of cold air should be prevented by rigging tarpaulin screens or some similar device. ir screens may be fitted on some ships. @5 onitor temperature in the compartment during loading and should it rise above specified level, close the compartment andthe recool it. >5 1o walling should be permitted on cases of fruit, eggs or cheese as they are fragile /ver other fro+en cargo, shoes should be covered with clean gunny sacking or similar material. E5 *argo should not be dr agged, pushed or thrown. 7lings should be made in the hatch square. =5 roper cargo gear should be use d e.g. canvas nets for meat and trays for crates#cases of cheese, butter, eggs and fruit. G5 !eavy meat should not be stowed over light meat. 235 Taintable cargo should not be stowed with fruit nor loaded in a compartment which has carried fruit unless it has been de-odourised. 225 Thick paper should be pasted over $oints to prevent air leak. D) D"ing 0oage 25 onitor and record temperature in all compartments and ensure that it is maintained at the desired level. 2) onitor */ ? concentration in compartments carrying fruit and arrange etraction to ensure that it does not eceed @A. 3) In compartments containing meat */? may be in$ected upto > kg per 2333 cubic feet to help pressure it for a longer time. <5 &or chilled meat ventilation should be arranged to achieve complete air change ?3?@ times every hour.

CO Control 1) (ipening of fruit generates heat and */ ? which must be removed to preserve the cargo. aimum permitted concentration is @A.

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2) resence of */? helps preserve meat for a longer time and */ ? should be in$ected into the compartment loaded with meat, if necessary, upto 23A concentration. 3) */? concentration should be checked and recorded at least once daily, but preferably once every watch at sea. !) In the past litmus paper cartridge was used to determine */? concentration by lowering it into the hold . Its degree of disco louration indicated */? concentration. #) odern method is thermoscope in which a

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thus becomes very cold. It then passes through the evaporator, containing brine, before being drawn back into the compressor. *ooled brine is circulated through grids or batteries and thus cools the refrigerated compartment directly or indirectly.

sample of air is drawn from the hold and allowed to mi with cau stic soda. This generates heat which, when measured, indicates */? concentration.

Containers  considerable amount of refrigerated cargo is carried in containers. These are of two types: -

Gri" S(stem Or Diret Cooling

"rids of ?D pipes are fitted around the Ree#ers compartment through which cooled brine is containers with an independent electrical circulated. "rids are so arranged that damage or diesel driven refrigeration system. to one section can be compensated by etra  portholes which depend on eternal source cooling of other sections. for cooling. 

A"vantages o# %sing

&atter( S(stem Or /n"iret Cooling

no contamination or tainting ontainers are no stacking damage  no condensation damage  no insulation required in ships% cargo space.

ir is blown over a battery of pipes through which cooled brine is being circulated. This cooled air is then blown into the compartment through an arrangement of air ducts. 'arm air is etracted and again blown over the battery of brine pipes.

 

Re#rigeration S(stems  basic refrigeration system consists of compressor, condenser, epansion valve and evaporator. The coolant, freon gas, is compressed in the compressor, cooled and condensed into a liquid in the condenser and passed through the epansion valve where it epands and

ALAM/July 2002

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SAFETY PRECAUT/O.S O. FERR/ES; RO2RO CARR/ERS A.D CAR CARR/ERS GE.ERAL 25 7eaman working on vehicle decks and in close proimity to moving vehicles should wear safety helmets and clothing of high visibility, such as fluorescent Hslip-overs%. ?5 7uitable footwear should be wor n to avoi d risk of in$ury from securing gear. ;5 'here no other means of access is provided, care should be taken by personnel using loading ramps for access while vehicles are moving on or off the ship. <5 acks, trestles and lashing equipment should not obstruct walkways, doorways or emergency escapes. @5 7hip%s stores should not be stowed on any part of the parking area for vehicles. >5  lifebuoy with self-activating light and line of suitable length should be available close to the vehicle deck access doors. E5 ll decks should be kept free of water, oil and any other substance which might be conducive to a vehicle or cargo unit sliding. =5 ny spillage of petr ol, oil or carg o should be cleaned immediately0 sand boes, drip trays and equipment should be provided for such use on each vehicle deck. G5 There should be no sm oking or us e of naked lights on vehicle decks. 235 1otices setting out the precautions to be observed in handling and stowing vehicles should be prominently displayed in all vehicle spaces. 225 ny damage to electric lights and fittings should be repaired as soon as practicable. 2?5  very high standard of crew fire drill is essential.  patrol should be maintained on vehicle decks during the passage.

Sto)age O# +e*iles 25 ll vehicles should be stowed in a fore and aft direction as far as practicable. ?5 ny vehicle stowed athwartships should be securely lashed. ;5 8ehicles sho uld not be sto wed across a water spray fire curtain. <5 7pecial care should be taken in positioning and securing a vehicle or cargo unit when

ALAM/July 2002

decks are sparsely loaded to minimi+e the damage which would be caused by the vehicle breaking free into unrestricted space. @5 8ehicles containing dangerous cargoes should be handled in accordance with the code for portable tanks and road tank vehicles for the carriage of liquid dangerous goods in ships otherwise directed in the HBlue Book% or and the as International aritime angerous "oods *ode 4I" *ode5. If tanks are found to be leaking or having evidence of possible leakage or otherwise significantly damaged so as to possibly affect the integrity of the tank, the vehicle should not be accepted for shipment. 'hen the vehicle carries a transport emergency card 4tremcard5 for its load, the card should be lodged with the aster for reference in case leaks should develop during the voyage. >5 ny vehicle carrying dangerous goods should be segregated from other cargo, accommodation, machinery openings and animals, in accordance with the HBlue Book%. It should be readily accessible to an emergency party and, whenever practicable, located in a position convenient to fire fighting services and drainage scuppers. E5 ersonnel should not stand behind or between vehicles when these are manoeuvering. =5 ersonnel should not attempt to secu re a vehicle until the brakes have been applied and the engine switched on. G5 9ashing and securing of vehicles and cargo units should be carried out by men trained and eperienced in the task. 235 There shou ld be an adequate supply of efficient securing and lashing equipment which should be properly maintained and regularly inspected. 225 ll lashings should have suitable tightening arrangements. 2?5 9ashings should but be not tightened to ensure that they are secure over tightened so that unnecessary strain is thrown upon the lashing. *are should be taken to equali+e as far as practicable the tensions of the several lashings of a vehicle etc.

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2;5 ersonnel should not remain on internal $amming occur, care should be taken in case deck ramps which are being raised or lowered. of sudden release of the $am. ;5 ortable stanchions and hand rails should always be in position when portable decks are +entilation 25 8entilation systems serving the vehicle in use. <5 *are should be taken to ensure that decks should be in operation during loading and unloading and as many be necessary on portable decks are properly stowed and passage to avoid the accumulation of secured when not in use. @5 'hen portable decks are in the sto wed flammable and toic vapors. ?5 *onnecting doors between car-decks and position, access doors should be secured. machinery, service and accommodation spaces should be kept closed while the ship is at sea. ;5 *onspicuous notices should be posted warning against the starting of vehicle engines before doors leading to ramps are opened and before the vehicle is required to move. <5 ny refrigerated vehicle needing to run its refrigeration plant during the voyage should utili+e the ship%s electrical supply where practicable, in preference to running its engine.

Portable Car De!s 25 &requent inspections should be made of the equipment and associated gear used for raising, lowering and suspending portable decks. ?5 7eamen should stand clear while portable decks are being raised or lowered.

ALAM/July 2002

7hould

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T/M&ER CARGOES In many trades timber is carried in large quantities and may be loose or packaged. 9oose timber can be individual planks, cubic units, pit prop s or logs but the carriage of loose timber is mostly taken over by packaged timber mainly because packaged timber is much less cumbersome, more easily transportable, easily handled by mechanical means and therefore more economical.

Loose Timber But the carriage of logs is still a common trade although is usually done by vessels which are specially constructed for the purpose, and have their own suitable gear. In many frican countries from which timber is eported, logs are kept in floating ponds and are towed to the vessel by tugs. In some ports of discharge the timber is similarly discharged into the water and then transported by tug towage inland through canals and waterways. 9oose timber carriage involves high costs and a waste of labour. uch time and many has to be spent on handling and sorting out and the operation of loading or unloading loose timber cannot carried out with speed. This is more the casebewith conventional ships which are not specially constructed for the carriage of timber.

Pa!age" Timber Being packaged this form of timber carriage is much more speedy and economical, and can be easily and quickly handled by fork lifts and mechanical means. ackaged timber is presently increasingly carried in unit loads of uniform si+e, and speciali+ed vessels having suitable gear for unit loads are increasing in number. 7everal ports have separate terminals marked off for the working of such unit loads and the saving in terms of port stay and turnaround are gr eat. /verall, the advantages of packaged timber are increased efficiency of handling, use of less manpower at both the loading ends, faster turnaround of the vessel, and lesser damage and breakage.

ALAM/July 2002

Timber De! Cargo Timber is not only carried in holds but also on deck. 'hen timber is carried on deck there are great chances of its shifting, and with it not only the less of the cargo but damage to the vessel itself. It should therefore always be compactly, stowed and secured with adequate lashings. 7ome of the important procedures that must be observed when loading such cargoes are as follows: a5 The packages should be securely bound and in solid form. b5 /ne tier of dunnage should be laid with the planks close up on each other and placed athwartships. This helps to spread the weight of the cargo over the c5 fter every tier ofdeck. car go all loose space should be properly filled in or checked, to minimi+e the chances of shifting. d5 The packages should be stowed such that the lashing arrangements are not blocked or obscured. e5 ackages of different weight and si+ e are to be stowed separately or with suitable separation if stowed together, so as to prevent chances of damage. f5 s far as possible the packages should be stowed in a fore-and-aft direction so as to prevent shifting, also so as to enable proper lashings to be taken. g5 1ecessary arrangements should be made to tighten the lashings during the voyage, as this might be necessary due to vibrations or movement of the vessel. h5 s far as possible only uniform si+ed packages should be loaded on deck and irregular packages stowed 4in holds5, so that

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lashing and securing of the cargo on deck end be easier. 'henever timber is stowed on deck it must comply with the regulations of the I/ code of safe practice for ships carrying timber deck cargoes. This code applied to all vessels of ?< metres 4EG feet5 or more in length and deals with following:

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event of an emergency. The lashings should be of 2Gmm chain or wire rope of equal strength and should be eamined at least once in 2? months. If wire lashings are used they must be provided with a short length of chain so that their lengths can be regulated. The lashing spacing as shown in &igure 2.

2) Co%pactness The stow should be as compact and tight as possible, with each tier properly chocked before loading the net tier. ll spaces in the wells of vessels should be stowed as solidly as possible, this is more so in the case of vessels assigned timber loadlines, where the deckline is virtually raised to the level of the superstructure deck. +) ,to6age The cargo should be compactly stowed and should not interfere with the navigation of the vessel, and with any arrangements that may be necessary for temporary steering of the vessel. The stow should also free access to accommodation and permit machinery spaces and should not endanger the safety of the crew in their normal duties. If the stow requires uprights these should be placed not more than ; metres apart, and must etend to above the outboard top edge of the cargo. The uprights must be properly secured at their base and arranged such that each pair end be secured with athwartship lashings. 'here practicable permanent ports of the ships structure can also be used as uprights. ) Las#ings The entire deck stow should be provided with lashings which can be taken athwartships and secured to permanent eye pads or similar structures. )very lashing should be independent and should be provided by arrangements for shortening or lengthening ad$ustments turnbuckles as required during the course of the voyage. They should also be provided with sliphooks for releasing in the

ALAM/July 2002

9) Logs& !it !ops .nd ood !"lp 9ogs should be stowed as compact as possible in a fore and aft direction and should be interlocked. They should be stowed to facilitate the rigging of lashings and uprights as in the cease of packaged timber. it props and wood pulp, although must meet the same stowage requirements, are usually loaded as per local practice. :) $eig#t Of Dec ,to6 The height of cargo on deck would depend mainly upon the load bearing capacity of the deck. But in any case the height of the timber deck stow should not interfere with the navigation of the vessel. If the vessel is loading in a seasonal winter +one during winter or is epected to unload or pass through such a +one during the course of the voyage, the height of cargo on deck should not eceed the etreme breadth of the vessel. ;) ,afet Of Ce6 7afe access by to way crewofaccommodation be provided walk-ways withshould guard rails of 2 m height. lso an additional lifeline, along the centreline of the vessel, should be provided.

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Stabilit( *areful attention is to be paid to the stability of the vessel when loading timber cargoes. It should be remembered that during the voyage timber deck cargo would absorb considerable moisture by way of rain, ice or snow. ue allowance must be given to this and the vessel should have adequate initial " to allow for this factor. It would therefore be seen that the amount of timber carried on deck would have an important bearing on the ultimate safety of the ship. It is felt that as a general rule, on vessels fully loaded with timber, not more than of the weight of timber carried should be stowed on the open deck. 

mong the stability information carried on ships the aster and /fficers are also to have suitable information to enable them to foresee the stability characteristics of the vessel in relation to the deck loads, under all conditions of the intended voyage. In planning the loading and voyage with timber deck cargo the guidance information contained in the vessels stability booklet must be observed.

ALAM/July 2002

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MODULE = - &UL7 CARGOES ,aar"s In general, the ha+ards may be considered to fall into three categories: 25 Improper weight distribution resulting in structural damage a5 )cessive concentration of weight on deck or inner bottom. b5 Improper distribution of weights between holds. ?5 Improper stability or reduction in stability a5 Too stiff a vessel resulting in violent rolling and possible cargo shifts and structural damage. b5 reduction in stability as a result of:i5  transverse shift of the cargo surface as in the case of C(KD cargoes and cargoes which do not become fluid when wet. ii5  transverse shift of C')TD cargoes which become fluid and give rise to free surface effects. ;5 *hemical (eaction:  few cargoes like fine copper ore, etal turnings and borings are sub$ect to spontaneous heating.

DEF/./T/O.S &%l! Cargo  cargo consisting of solids in particle or granular form, with or without entrained moisture, generally homogeneous as to composition and loaded directly into a vessels cargo spaces without bagging or packaging.

Conentrate That material obtained when a natural ore has undergone some form of purification by a physical separation of undesired ingredients. In contrast to natural ores which contain a considerable percentage of large particles and lumps, concentrates ordinarily consist of a miture of small particles.

Angle o# Re'ose ngle of repose is between a hori+ontal plane and the cone slope obtained when bulk cargo is emptied on to this plane.  low angle of repose characteri+es a bulk cargo which is particularly liable to dry surface movement aboard ship.

C(KD bulk cargoes include Cores and similar bulk cargoesD

GE.ERAL PRECAUT/O.S 0/T, &UL7 CARGOES

C')TD bulk cargoes come under the heading of C/re *oncentratesD

25  stability booklet should be provided. ll relevant information in connection with loading, precautions and any necessary data should be supplied to the aste r. rior to sailing, the aster should calculate the stability for the anticipated worst conditions during the voyage as well as that on departure and ensure they are satisfactory.

rovisions of the code apply when bulk cargoes from a considerable part of the total cargo for the voyage. 'hen bulk cargoes ecept ore concentrates, make up less than /1)-T!I( of the cargo deadweight of the vessel, the aster at his discretion may depart from the portions of the *ode that are not considered to apply. In the case of small part cargoes of concentrates carried in general cargo vessel it may not be necessary to comply fully with these provisions.

?5 n ecessively stiff ship may roll very violently, resulting in damage to the ship. !owever, a vessel with a relatively large " is better able to resist the tendency to list, if a shift of cargo should occur. &or this reasons, no concern should be felt about operating a bulk laden vessel with a large " where eperience has shown that the resulting motion is not too severe.

ALAM/July 2002

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;5 'hen loa ding a high den sity bul k cargo with a 7.&. of about ?3 cu. ft. per ton 43.@> m@#ton5 or lower, the loaded conditions are different from normal and particular attention should be paid to the distribution of weights to avoid ecessive stresses.  general cargo vessel is normally constructed to carry cargoes of about @3 - >3 cu. ft.#ton 42.;G to 2.>E m;#ton5 when loaded to full bale and deadweight capacity. In such cases, the shipmaster should be provided with comprehensive loading information so that the ship may not be overstressed. <5 'here such information is not available, the following precautions should be observed: a5 The general fore and aft distribution of cargo by weight should not differ appreciably from that found satisfactory for general cargoes. b5 The maimum member of ton s of cargo loaded in any hold should not eceed 3.G 9B metric tons where 9 - 9ength of hold, B F average breadth of hold and  F summer load draught 4all in metres5. c5 'here cargo is untrimmed or only partially trimmed the height of the cargo pile peak above the hold floor should not eceed. 2.2    7towage factor 47.&. in m;#ton5 d5 If the car go is trimmed entirely lev el, the maimum load in the lower hold may be increased by ?3A sub$ect to compliance with 4a5 above. e5 In holds wit h a shaft tunnel, lower holds may be loaded to 23A in ecess of the trimmed or untrimmed values sub$ect to compliance with 4a5 above.  shaft tunnel has an etra stiffening effect. @5 recautions should be take n to prev ent dust from coming into contact with deck machinery. 8entilation systems to accommodation spaces should be screened or shut down.

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&%l! Cargoes ,aving An Angle O# Re'ose Greater T*an 6= 25 !igh density cargoes should be loaded entirely in the lower holds unless this results in the ship being Ctoo stiffD or if cargo weight on bottom structure is ecessive. ?5 *argo should be trim med sufficiently to cover the tank top. This trimming can be accomplished by leaving within the hatch square sosides that the is uniform the ships and slope substantially so, towards to the end bulkheads. The importance of trimming to prevent a shift of cargo is stressed. This advice applies especially to smaller vessels i.e. 233 metres or less in length. ;5 'hen cargo is carried in tween decks to reduce stiffness, it should be the least amount necessary to do so. <5 If cargo is lo aded in twe en decks, hatches should be closed and cargo trimmed reasonably level. If cargo does not etend side to side and bulkhead to bulkhead then it should be stowed in bins.

&%l! Cargoes ,aving An Angle O# Re'ose Less T*an 6= These cargoes are more liable to shift in a seaway. Thus they require more trimming. 7paces in which they are loaded should be preferably filled without overstressing the vessel. In tween decks they should be loaded in bales or be fitted with shifting boards similar to grain cargoes. 7i+es of shifting boards should be adequate for the density of the cargo.

>5 !olds should be thoroughly inspected prior to loading. Bilge wells and stra iner plates should be prepared to facilitate drainage. Bilges should be frequently sounded during and after loading.

ALAM/July 2002

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CARR/AGE OF COAL The main consideration to keep in mind with coal is that it emits methane, an odorless, flammable gas which is less dense than air. This gas is emitted particularly if the coal has been freshly mined or if it is dropped into the hold when loading, causing it to break up. Thus a risk of fire and eplosion is always present on a ship carrying coal.

Bulkheads between coal carrying compartments and accommodation or machinery spaces must be gas tight. eck houses and other compartments on deck may collect methane and must be well ventilated at all times. 1o naked lights or smoking must be allowed in

ethane levels of between @A and 2@A in air constitute an atmosphere which can be readily ignited and eplode.

or near a coal-carrying compartment. *are must be taken not to create sparks as a result of impacts of steel on steel.

any classes of coal, including anthracite, are liable to spontaneous combustion if allowed to heat ecessively.

The absorption of oygen from the air by the coal loads to oidation and the evaluation of more methane and heat generation. The cargo must therefore not receive through ventilation, 7paces in which coal is to be stowed should but generous surface ventilation must be be carefully cleaned, ensuring that all traces of provided to quickly remove any evolved gas oil or grease and of previous coal cargoes are and keep the cargo cool. !atch covers may be removed. Bilges and scuppers must be tested opened during suitable weather to assist this. and in working order and electrical wiring in the compartment disconnected or sheeted in If the temperature of the coal is found to rise heavy gauge screwed steel conduit. too much, it may be necessary to cool the ad$acent bulkhead by directing hoses at it and &ire fighting, life saving and smoke detection removing the water via the bilge pumps. equipment must be carefully eamined and tested. The fire fighting equipment should be  methanometer being carried on board to test available for immediate use at all times when for the presence of methane around the loading and on passage. The smoke detection vessel. equipment must be continuously operated and monitored regularly. /nly intrinsically safe torches and other equipment may be used in or near coal rrangements should be made before loading compartments. to enable temperatures to be taken at the ends of compartments and in the bottom of the *oal must be segregated from any other cargo stow via suitable pipes from the deck, to liable to spontaneous heating and must be ensure rapid detection of a temperature rise. kept clear of warm bulkheads. 'hen loading in the hatch square using It must also be stowed away from cargoes chutes, etra boards should be provided in the liable to damage from coal dust. If necessary, hold to prevent damage to the tank top plating. other cargo in the same compartment may be completely covered with tarpaulins or other The arrangements for carrying a coal may, if dust-proof materials. the mast er so requires, be eamined by a arine epartment 7urveyor to ensure that the vessel is in all respects satisfactory.

ALAM/July 2002

'hen loading small coal, shifting boards may be necessary to prevent the movement of cargo on passage. uring loading, the coal should be carefully trimmed into the winds and ends of compartment to achieve a level stow, preventing any shifting and also the

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accumulation of pockets of methane above the stow. If a coal fire breaks out when on passage, steam in$ection must not be used to etinguish the fire, and it should be controlled using */?, inert gas or high epansion foam, which should be in$ected into the compartment. The vessel should head for the nearest port and keep the hatches sealed until specialist advice is obtained. )ntry into aby coal compartment must breathing only be attempted personnel wearing apparatus and having adequate back-up personnel to render assistance standing by on deck. Through ventilation of the space must be provided before entry is attempted and during the time that crew members are in the space.

ALAM/July 2002

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GRA/. 0*at /s Grain ll cereals e.g. wheat, rice, barely, oats pulses, seeds, corn and rye, in processed and unprocessed forms, are classified as grain in so far as their transportation by sea is concerned. It can be carried in bags or in bulk.

Pro'erties O# Grain a5 It is easily taintable b5 It is sub$ect to heat ing and condensation particularly if it is shipped at the beginning of the season. It readily absorbs moisture. c5 It is likely to move if tilted beyond its angle of repose.

Prea%tions Relating To Carriage O# Grain +) Cleanliness a5 *ompartment where grain is to be loa ded should be perfectly clean and free of any odour. b5 The bilges should be free and clean particular attention being given to the strum bo.  coating of lime and cement wash is advisable. c5 The limber boards should be in good condition and repair, seams caulked. Burlap should be laid over the limbe r boards and nailed down to prevent grain from entering the bilges and bilge well. d5 The tank-top cei ling, if fitted, should be clean, dry and free from any stains and with seams properly caulked. If ceiling is damp and stained, sprinkle lime all over, leave for a while and then sweep it away. e5 The entire compartment including bilg es, limber boards, spar ceiling, side battens, pipe guards, fittings and all spaces including those over the top of deck hold beams and frames should be free of infestation of any kind.

') #en Caied In B"l Both air intake and etractors are to be directed at the surface. 2) ,#ifting Boads "rain in bulk, when tilted beyond its angle of repose will shift and will not return readily to its original position. This will cause a corresponding shift in the position of centre of gravity H"% of the ship and thus influence righting moments and endanger the ship%s stability. Therefore, measures have to be taken to ensure that shift of grain due to hauling movements of the ship is restricted to the minimum. These comprise of: a5 )recting of shifting boards0 b5 /ver stowing bulk grain with bagged cargo or other suitably packed cargo or strapping it down. c5 *onstruction of fee ders to fill vo id spaces resulting from settling of cargo during the voyage.

) 0entilation a) #en Caied In Bags The air intakes are to be at the bottom layers of cargo while the air etra ctors are to be aimed at the top layers.

ALAM/July 2002

etailed specifications of shifting boards, feeders and other methods for securing grain cargoes are given in I/ "(I1 (69)7

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which also specify stability requirements of ships used for carriage of grain in bulk..

reduce the effect of grain shifting depends upon the stability of the vessel.

/MO Grain R%les

9ongitudinal divisions or shifting boards, which must be grain tight, may be fitted in both filled and partly fill ed com partments. In fill ed compartments they must etend downwards from the underside off deck to a dist below the deckline of at least 2#=th the breadth of the compartment, or at least 3.>m below the surface of the grain after it has been assumed to shift through an angle of 2@ °. In a partly

These rules must be complied with in all respects when carrying bulk grain. "rain is defined as 'heat, (ice, *orn, (ye, /ats, barley, pulses, seeds and their processed forms. The rules are in three part s. art  deals with definitions, shifting boards, stability requirements and information, maimum permissible heeling moments, loading instructions and a worked stability and loading eample. art B deals with the affect on the stability of the vessel caused by a shift of grain. art * deals with the specifications of shifting boards, saucering and building of grin and securing the cargo in a partly filled compartment.

Stabilit( The main criteria in connection with bulk grain loading is the stability of the vessel and this must be kept foremost in all loading procedures. The I/ grain rule outline the minimum stability requirements of a vessel loading bulk grain and these are as follow: 1) The angle of heel due a shift of grain should not eceed 2?° ?5 The initial ", after correction for any free surface effect, should not be less than 3.;3m. 3) The remaining area between the srcinal curve of righting levers and heeling arms upto <3° heel must not be less than 3.3E@ metreradians. 4If openings in the vess el which cannot be made watertight immerse at a smaller angle then such an angle5.

Grain Fittings In any compartment filled with grain there will remain a void space between the top of the cargo and the deck head of the compartment and it is to be ensured that the free surface effect and the heeling moments of a vessel so

filled compartment thethe division should etend both above and below level of the grain, to a distance of 2#=th the breadth of the compartment. 25 ll timber used for gra in fittings shall be of sound quality and proven satisfactory for the purpose for whi ch it is intended. 7uitably grained and bonded plywood can be acceptable provided its strength is equivalent to solid timber. ?5 6prights must be of sound construction and adequately secured against displacement from their end sockets. 'here ther e is no securing at the top, then the upper most shore or stay must be fitt ed as nea r there to as possible. ;5 7hifting boards should have a thickness of not less than @3mm, be grain tight and where necessary, supported by uprights.

&agging In partly filled compartments the grain tight can be topped off by loading bagged grain or other suitable cargo. In this case the surface should be properly levelled off, over which should be spread separation cloth 4gunny sacks5.  platform made by spreading wooden boards on wooden bearers can be used instead of separation cloth. The bulk cargo should now be over stowed with sound, well filled bags to a height of 2#2>th the maimum breadth of the free grain surface, or to a height of 2.? metres, whichever is greater.

loaded do innot affect behaviour theadversely void spaces andthe thatgrain the vessel is at all times left with adequate stability. The need to provide shifting boards or other temporary grain fittings in order to

ALAM/July 2002

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Stra''ing or Las*ing The surface of the grain in partly filled compartment may also be secured by strapping or lashing. In this case the surface of the grain is levelled, but slightly crowned. The surface is then covered with separation cloth or tarpaulin, whose $oints overlap at least 2.=m. /ver this two solid floors of ?@mm timber should be laid. The first tier athwartships and the top tier for-and-aft. These floors are lashed down with double steel strapping, wires or chain with a breaking strength of at least @333 kg. and their ends attached to shackle or beam attachments at a point appro <@3mm below the final grain surface. The lashings should not be placed more than ?.< metres apart. The lashings must have tensioning arrangements and these must be checked and ad$usted regularly during the voyage.

ALAM/July 2002

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CARR/AGE OF DA.GEROUS GOODS /. PAC7AGED FORM OR /. SOL/D FORM /. &UL7 goods which shall include the precautions necessary in relation to other cargo.

Reg%lation 1 - A''liation 25 6nless epressly provided otherwise, this part applies to dangerous goods classified under regulation ? which are carried in packaged form or in solid form in bulk 4hereinafter referred to as Hdangerous goods%5, in all ships to which the present regulations apply and in cargo ships of less than @33 tons gross tonnage. ?5 The provisions of this part do not apply to ships% stores and equipment. ;5 The carriage of dangerous goods is prohibited ecept in accordance with the provisions of this part. <5 To supplement the prov isions of this part, each *ontracting "overnment shall issue, or cause to be issued, detailed instructions on safe packaging and stowage of dangerous

ALAM/July 2002

Reg%lation  - Classi#iation angerous goods shall be divided into the following classes: Class + )plosive. Class  "ases: compressed, liquefied or dissolved under pressure. Class 2 &lammable liquids. Class 95+ &lammable solids. Class 95 7ubstances liable to spontaneous combustion. Class 952 7ubstances which, in contact with water, emit flammable gases.

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Class :5+ /idi+ing substances. Class :5 /rganic peroides. Class ;5+ oisonous 4toic5 substances. Class ;5 Infectious substances. Class < (adioactive materials. Class = *orrosives. Class @ iscellaneous dangerous substances, that is any other substance which eperience has shown, or may show, to be of such a dangerous character that the provisions of this part shall apply to it.

Reg%lations 6 - Pa!aging 25 The packaging of dangerous goods shall be: 2.25 well made and in good condition0 2.?5 of such character that any interior surface with which the contents may come in contact is not dangerously affected by the substance being conveyed0 and 2.;5 capable of withstanding the ordinary risks of handling and carriage by sea. ?5 'here the us e of abso rbent or cus hioning material is customary in the packaging of liquids in receptacles, that material shall be: ?.25 capable of minimi+ing the dangers to which the liquid may give rise0 ?.?5 so disposed as to prevent movement and ensure that the receptacle remains surrounded0 and ?.;5 where reasonably possible, of suff icient quantity to absorb the liquid in the event of breakage of the receptacle. ;5 (eceptacles containing dangerous liquids shall have an ullage at the filling temperatures sufficient to allow for the highest temperatures during the course of normal carriage. <5 *ylinders or rece ptacles for gas es under pressure shall be adequately constructed, tested, maintained and correctly filled.

ALAM/July 2002

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@5 )mpty uncleaned receptacles which have been used previously for he carriage of dangerous goods shall be sub$ect to the provisions of this part for filled receptacles, unless adequate measures has been taken to nullify any ha+ard.

Reg%lation < - Mar!ing; Labelling An" Plaar"ing 25 ackages containing dangerous goods shall be durably marked with the correct technical name0 trade names alone shall not be used. ?5 ackages containing dangerous goods shall be provided with distinctive labels or stencils of the labels, or placards, as appropriate, so as to make clear the dangerous properties of the goods contained therein. ;5 The method of marking the correct technical name and affiing labels or apply stencils of labels, or of affiing placards on packages containing dangerous goods, shall be such that this information will still be identifiable on packages surviving at least three months% immersion in the sea. In considering suitable marking, labelling and placarding methods, account shall taken of the durability of the materials usedbe and of the surface of the package. <5 ackages containing dangerous goods shall be so marked and labelled ecept that: <.25 packages containing dangerous goods of a low degree of ha+ard or packed in limited quantities0 or <.?5 when special circumstances permit, packages that are stowed and handled in units that are identified by labels or placards0 may be eempted from labelling requirements.

Reg%lation = - Do%ments 25 In all documents relating to the carriage of dangerous goods by sea where the goods are named, the correct technical name of the goods shall be used 4trade names alone shall not be used5 and the correct description give in accordance with the classification set out in regulation ?.

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?5 The shipping documents prepared by the shipper shall include, or be accompanied by, a signed certificate or declaration that the shipment offered for carriage is properly packaged and marked, labelled or placarded, as appropriate, and in proper condition for carriage. ;5 )ach ship car rying dangerous goods shall have a special list or manifest setting forth, in accordance with the classification set out in regulation ?, the dangerous goods on board and location thereof.  detailed stowage plan the which identifies by class and sets out the location of all dangerous goods on board may be used in place of such special list or manifest.

Reg%lation > - Sto)age Re$%irements 25 angerous goods shall be stowed safely and appropriately in accordance with the nature of the goods. Incompatible goods shall be segregated from one another. ?5 )plosives 4ecept ammunition5 which present a serious risk shall be stowed in a maga+ine which shall be kept securely closed while at sea. 7uch eplosives shall be segregatedandfrom )lectrical apparatus cables detonators. in any compartment in which eplosives are carried shall be so designed and used as to minimi+e the risk of fire or eplosion. ;5 angerous goods in packaged form which give off dangerous vapours shall be stowed in a mechanically ventilated space or on deck. angerous good in solid form in bulk which give off dangerous vapours shall be stowed in a well ventilated space. <5 In ships carrying flammable liquids or gases, special precautions shall be taken where necessary against fire or eplosion. @5 7ubstances

which

are

liable

to

spontaneous heating or combustion shall not be carried unless adequate precautions have been taken to minimi+e the likelihood of the outbreak of fire.

ALAM/July 2002

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Reg%lation @ - E4'losives /n Passenger S*i's 25 In passenger ships the following eplosives only may be carried: 2.25 safety cartridges and safety fuses0 2.?5 small quantities of eplosives not eceeding 23kg total net mass0 2.;5 distress signals for use in ships or aircraft, if the total mass of such signals does not eceed 2,333kg0 2.<5 ecept in ships carrying unberthed passengers, fireworks which are unlikely to eplode violently. ?5 1otwithstanding the provisions of paragraph 2, additional quantities or types of eplosives may be carried in passenger ships in which special safety measures approved by the dministration are taken.

Carriage O# Dangero%s Goo"s The term dangerous goods is commonly applied to a wide range of non-bulk cargoes which for one reason or another are considered to be potentially dangerous. Because of this, the carriage of dangerous goods is governed by a set of regulations, compiled in accordance with 7/97 2GE< *hapter 8II 4*arriage of angerous "oods5. art  of this chapter applies to dangerous goods carried in packaged form or in solid form in bulk, in all ships and in cargo ships of less than @33 tons gross tonnage. art B and * of this chapter - *onstruction and )quipment of ships carrying dangerous liquids chemicals in bulk and liquefied gas in bulk respectively. The packaging and labelling of dangerous goods shall be in accordance to the class of the dangerous goods and requirements of I" *ode. The regulations state that the shipper must supply the following information on the package to be shipped: -

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the correct shipping name 4technical name5 for each dangerous goods 4trade names are not acceptable5.  the 61 number of the dangerous goods.  appropriate class and subsidiary risk labels, or of affiing placards.  other additional markings as required. 

In addition the shipping documents prepared by the shipper shall include or accompanied by, a signed certificate or declaration that the dangerous goods is properly packaged and marked and safe carriage.safely The dangerous goods shall be forstowed and be segregated in compliance with the I" *ode.

Marine Poll%tant These classes each have a distinctive label, diamond in shape with the ha+ard type printed on it as well as the class 1umber, in addition the colour coding gives some indication as to the danger.

/:M:D:G /nternational Maritime Dangero%s Goo"sB Co"e I" *ode consists of four 8olumes and 7upplements, namely 8olume I, 8olume II, 8olume III, 8olume I8 and 7upplement *ode. The "eneral Table of *ontents of these volumes and supplement are as follows: -

General Table O# Contents +ol%me / 9ist of abbreviated units "eneral Introduction to the *ode  nne I - acking recommendations  "eneral inde 4alphabetical5 of dangerous goods  1umerical inde 4table of 61 numbers with corresponding I" *ode page numbers, )7 numbers and &" table numbers5  9ist of definitions 



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*lass ; - &lammable liquids

+ol%me /// 9ist of abbreviated units  *lass < - &lammable solids  7ubstances liable to spontaneous combustion  7ubstances which, in contact with water, emit flammable gases  *lass <.2 - &lammable solids  *lass <.? - 7ubstances liable to spontaneous combustion 



*lass <.; - 7ubstances which, in contact with water, emit flammable gases  *lass @ - /idi+ing substances and organic peroides  *lass @.2 - /idi+ing substances  *lass @.? - /rganic peroides

+ol%me /+ 9ist of abbreviated units  *lass > - oisonous 4toic5 and infectious substances  *lass >.2 - oisonous 4toic5 substances  *lass >.? - Infectious substances  *lass E - (adioactive materials  *lass = - *orrosives  *lass G - iscellaneous dangerous substances and articles 

S%''lement 9ist of abbreviated units  )mergency rocedures 4)m75  edical &irst id "uide 4&"5  7olid *hemical in Bulk 47B *oce5  (eporting rocedures acking transport 4pcs5  6se of pesticides in ships 

cargo



+ol%me // 9ist of abbreviated units  *lass 2 - )plosives  *lass ? - "ases: compressed, liquefied or dissolved under pressure 

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Assignment lease complete the assignment and return to 9 25 7tate the ma$ or ha+ards in the car riage of dry bulk cargoes on ships. ?5 7tatecode, the classes as mentioned in the I" also state the information required to be supplied by the shipper to the aster of the 8essel.

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MODULE > - TA.7ERS Tankers vary in si+e, type and design depending upon the trade that they may be engaged in. The construction of tankers, although changed greatly and advanced with the various types of cargoes, is basically the same for all types. The operation of tankers must comply with many local and International rules, some of them being I/ rules regarding oil pollution, personal safety, maritime safety and loading constraints. lso at national level tankers have to comply with the /T regulations, TI of 6.., *oast "uard regulations of the 67, aritime 7afety gency regulations of apan, etc. /il cargoes are generally divided into two classes:  9ight oil which include various spirits such as gasoline white spirit, alcohol, kerosene, light gas oil, etc. and  !eavy oils which include crude oils, asphalt, fuel oils, heavy gas oils, diesel oil, lubrication oils, etc. The discharge of oil is carried out by suction pipes from the tanks via the pumprooms to the manifold on either side of the deck or even at the stern. aster valves permit and regulates the discharge. 8entilator piping is provided on deck so as to release ecess gasses into the atmosphere through #8 valves or mast risers. ost tankers are loaded and discharged in the same manner ecept that more stringent measures are necessary with cargoes having low flash points.

Pi'eline La(o%t )ach ship owner may have his preference of pipeline layout depending upon the trade that the vessel may be engaged in. The most common types are as follows: 1) 1ee flo6 sste% - is generally used on large crude carriers employed on fied routes. This system is very simple0 pipelines are generally of high capacity and therefore capable of trimming the vessel as the loading progresses. There is a sluic e v#v at eac h bulkhead to allow oil flow from every tank simultaneously as required.

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Diectof lin e sstetanks % - this allows 2) fleibility isolating in the eventthe of different grades of oil being carried. In this system there can be three or more independent lines, which can be used when different grades are carried. )ach line serves appro imately one third or one-fourth the number of tanks. But if only one grade is carried these lines can be linked together by means of cross overs.

3) Ring %ain sste% - lines run from the pumproom in a ring fashion serving all the tanks. The rings end can be made common by opening the cross over v#vs.

Terms Use" /n Oil Carriage Ullage The space height left in a tank between the surface of the oil and the tank top for any epansion of the cargo, it is usually about ?A of the tank capacity in loaded condition.

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Flas*'oint

Eart*ing Or Gro%n"ing

The temperature at which the oil gives off sufficient vapour at such concentrations, which will catch fire or eplode if mied with air and eposed to naked light#incendive spark.

The electrical connection of equipment to main body of the earth. /n board shop the connection is made to the main metallic structure of the ship, which is at earth potential because of the conductivity of the sea.

Dangero%s Oils /ils having flash points less than E; ° & or ?; ° 4*5.

Or"inar( Oils °

/ils between E; & and 2@3°&having or over flashpoints ?;°4c5 and >@.@ ° 4c5.

/gnition Point The temperature at which the oil gives off vapour at a rate, which allows continuous burning when a flame is applied.

Gas Free 'hen sufficient fresh air is introduced into a tank or compartment lower the levels of any flammables, toic or inert gases to those required for specific purpose, e.g. main entry, hot work, etc.

/nert Gas  gas such as nitrogen, */?, or mitures of gasses such as flue gas containing insufficient oygen to support the combustion of hydrocarbons. 4I/ ()ST - B)9/' =A5

+isosit( The quality of liquids whereby they resist internal flow.

&a!'ress%re The pressure that a pump might have to counter due to oil already contained in a length of pipeline, frictional resistance, or bends in the line. The pump has to overcome this pressure, which is registered on the pressure gauge as soon as the pump is started.

Sam'ling 7mall quantities of oil are taken from the ship%s tanks into bottles after the completion of loading. These are tested in the laboratory for quality and grade and on satisfactory testing one sample is kept with the loading terminal while another is sealed and sent back to the ship for delivery at the discharge port where the sealed sample is compared again with fresh samples taken from the tanks prior to discharge.

&on"ing The connecting together of metal parts to ensure electrical continuity

/nert Con"ition 'hen a tank or compartment has its oygen content reduced to below =A by volume by the addition of inert gas.

Stati Eletriit( The electricity produced on dissimilar materials through physical contact and separation.

Stri''ing The final operation in pumping out of liquids 4the last quantity5 from a tank or pipeline.

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The main advantages of this system are:  The cleaning equipment is inside the tanks there is no need to keep the tank ports open, which result in the escape of hydrocarbon vapours. Tan! Cleaning  The sediment is discharged along with The amount of cleaning that a tank requires cargo as it dissolves in crude oil. would depend upon the nature or grade of  The sludge remaining in the tanks is oil to be carried. *lean oils e.g. naphtha, minimal hence more of net cargo can be aviation spirit, lubrication oils, etc. require loaded. a high standard of cleaning, black oils  Because of much less sludge retention in such as fuel oil do not require such high tanks the cargo out turn is better. standards of cleanliness although with the  technique known as crude oil washing, washing It is much conventional water and faster saves than manpower required for crude oil tanks do reach high standards. manual desludging.

+olatilit(

The tendency of a liquid to produce gas vapour by evaporation.

*onventional tank cleaning uses high speed steam in$ection into tanks for about > - = hours followed by hose washing using Butterworth machines and adequate ventilation. !ot water is used for hose washing so that the residue is more easily removed. If necessary a further steaming for ? - < hours is carried out followed by the final washing down.

Cr%"e Oil 0as*ing *rude oil washing is the procedure where by the washing of the tanks is done by crude oil itself when the discharge is in progress. The system has the fied cleaning machines fitted inside the tank itself, and before the cleaning is started the atmosphere inside the tank is made safe by in$ecting inert gas so as to lower the oygen level of the tank to below =A.

Loa" On To' Proe"%res This technique was introduced on tankers in the early 2G>3s, and is a common practice on crude oil carries and even on some product carriers, it is as follows:  tanker begins her passage with dirty ballast. uring the passage tanks to be filled with clean ballast are cleaned, then filled with seawater ballast. The bottom portion of the dirty ballast is then carefully pumped over board. rovided that it has settled for a few days. This bottom water should be clean, free oil having floated to the surface. It should still be discharged outside prohibited +ones since it is bound to contain a small amount of oil. t this point in the procedure each dirty ballast tank contains several feet of residues, which should be stripped into a single slop tank. The resultant oil and water miture is allowed to settle in the slop tanks for a few days, after which the clean bottom portion is pumped over board the remaining slops are retained and mied with the net cargo. In this manner a tanker enters he prohibited +one at the end of her ballast voyage with clean ballast in her tanks and small quantity of slops.

Meas%rement O# T*e Cargo The following considerations are taken into account when arriving at the quantity of cargo in a tank: -

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the accurate measurement of ullage, which measures the height remaining in the tank above the top of the oil.  the quantity of water if any is determined by the use of a dip rod at the end of which is applied water finding litmus paste, which changes colour when in contact with water.  temperature of the cargo at three levels should be taken to arrive at a mean temperature. *hanges in temperature affect the volume of a liquid, causing epansion or contraction.  rise in temperature causes a 

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225 *argo 91 - check this for the following information: a5 roducts to be loaded in each tank b5 &inal ullage for each tank c5 7" and appro. temperature of each product d5 Total weight or quan tity in barre ls of each product e5 &inal draft and trim 2?5 7tart loading slowly and ensure that cargo is flowing into the desired tanks.

decrease in 7"with andaan in volume and vice versa fallincrease in temperature. The amount by which the 7" changes per degree of temperature is known as the 7" correction coefficient. These coefficients vary with the grade of oil0 oil is shipped at some agreed temperature, so any difference of temperature necessitates a correction to be applied. 7" correction coefficient tables are also available for quick working.

&e#ore Loa"ing Or Dis*arge The following are some of the precautions that are to be taken before commencing loading: 25 7cupper plugs - ensure that all deck scuppers have been plugged and cemented. ?5 7ea suctions - all sea v#vs to be lashed on closed position. ;5 !ose connections - check for tightness, keep empty drip tray under each. <5 HB% flag an d red light - to be dis played prominently. @5 *argo pipeline lin eup - checked by two officers preferably. >5 *argo tanks and tank v#vs - tanks to be T, v#vs ready for opening. E5 ump suction and discharge valves to be open. =5 Terminal information: a5 7equence b5 9oading rate c5 1o. /f shore pumps to be used d5 1otice prior to topping up or closing e5 7ignals for shutting down G5 ark hose, with chalk. 235 eclaration on inspection - all tanker officers and terminal representative are required to carry out checks and inspection of various procedures and safety precautions and sign the declaration or check list.

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Tan!er Sa#et( C*e!list 25 Is the ship securely mooredU ?5 re emergency towing wires correctly positionedU ;5 Is there a safe access between ship and shoreU <5 Is the ship ready to mo ve under its own powerU @5 Is there an adequate deck watch onboard and adequate supervision on the terminalU >5 Is the agreed ship#shore communication system operativeU E5 !ave the pro cedures for cargo, ballasting and bunkering been agreedU =5 !as the emergency shut down procedures been agreedU G5 re car go an d bunker hos es or arms in good condition and properly connectedU 235 re fire hoses and && onboard and ashore ready for immediate useU

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225 re scuppers effectively plugged, and drip trays in position both onboard and ashoreU 2?5 re unused cargo and bunker connections, including stern discharge line if fitted are blankedU 2;5 !ave sea and overboard discharge v#vs, when not in use, closed and lashedU 2<5 re all cargo and bunker tank lids closedU 2@5 Is the agreed venting system being usedU 2>5 re hand torches of an approved typeU 2E5 re portable 8!!& transceivers of an approved typeU 2=5 re the ships main radio transmitter aerials earthedU 2G5 re electrical cables to portable electrical equipment disconnected from powerU ?35 re all eternal doors and ports in the midships accommodation closedU ?25 re all doors and ports in the after accommodation leading to or over looking the tank deck closedU ??5 re air conditioning intakes, which may permit the entry of petroleum gas, closedU ?;5 re window type air conditioning units disconnectedU ?<5 re smoking requirements being observedU ?@5 re the requirements for the use of galley and other cooking appliances being observedU ?>5 re naked lights requirements being observedU 4To be signed on behalf of the ship and also on behalf of the terminal5

Tan! 0as*ing 0it* Cr%"e Oil *rude oil washing has been practiced by ma$or tanker operators for several years. )perience gained suggests that it is in the interests of the industry and community as a whole to adopt crude oil washing on all suitably equipped vessels.

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carrying capacity. ll oil and sediment be removed from cargo tanks, which are to be used for clean ballast.

0*( Cr%"e Oil An" 0*( .ot 0ater Traditionally, tanks have been cleaned by washing with $ets of water, but such method of washing produces a large amount of oily water, which must be separated. The separation process is complicated by the oil and water emulsions which are produced during washing. This has led to the retention on board of large quantities of water along with the slop oil, recovered by the load-on-top procedure. 6nder the load-on-top procedure, cargo is subsequently mied with the oil and#or water and is discharged as part of the cargo at the receiving port. *rude oil washing is a process whereby part of the cargo is circulated through the fied tank cleaning equipment to remove the way asphaltic deposits. This is normally carried out during discharge. *rude oil washing has proved to be more effective than water washing for this purpose because the crude oil acts to disperse and suspend the sediments and tends to restore the cargo to its as loadedballast condition. the tank for clean or for Ifentering intoisit required for survey, repairs etc, after crude oil washing, water washing will become necessary.

,istorial &a!gro%n"

In the past it has been recogni+ed that crude oil itself might be the most effective medium for removing crude oil sediments from tanks. Then came the invention of tank cleaning apparatus fitted within the tanks and served by permanent piping, which made it possible for cargo to be circulated through the tank A#ter Dis*arge O# Cr%"e Oil cleaning system without risk of escape from fter discharge of cargo, ship%s tanks, which hose connections or deck openings. Inert gas have held crude oil, usually contain deposits of was then introduced, which provided a means sediment on the tank bottoms and other of controlling the tank atmosphere and hori+ontal surfaces of the tanks structures. keeping it outside the flammable range. This sediment, which has settled from the cargo on passage, consists mainly of way A"vantages O# and asphaltic substances. If allowed to remain Cr%"e Oil 0as*ing it will build up after several voyages and +5 Cago O"tt"n impede draining and also reduce cargo-

ALAM/July 2002

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%$ Malaysian Maritime Academy


The most important advantage, and the one from which the other advantages come to the limelight, is that substantially the whole of the sediment can be discharged with the bulk of the cargo. This is refinable material, which is part of and entirely suitable for discharge with, the remai nder of the cargo . fter crude oil washing only small quantities of cargo will remain in the tanks, pumps and pipelines. The comparative figures for oil remaining in the cargo system of a ?2@,333-dwt ship after discharge are:fter oil wash fter crude conventional discharge

;33 tonnes appro 2333#?333 tonnes appro

5 !oll"tion .*oidance The load-on-top procedure is established as an acceptable method of controlling oil pollution of the sea. Its principle feature is the separation and retention aboard of the oil content of the oil#water mitures generated by the ballasting and water washing of oil tanks. 'ithout crude oil washing, large quantities of water are needed to clean crude oil tanks and the resulting mitures and emulsions, together with dirty ballast mitures, must be retained on board until they have been settled and separated. This process is much simplified when tanks have first been crude oil washed. The oil content of dirty ballast is greatly reduced. *argo tanks, which are to be used for clean ballast, need only a short rinse with water after oil washing, but pumps and lines will need to be thoroughly flushed with water. Tanks, which are not required for ballast, need not be water, washed, because the sediment is kept under control by crude oil washing. !ence, not only is the quantity of residue in the ship greatly reduced, but also tank washing is much smaller. These factors reduce the pollution. 25 C.RGO CONT.MIN.TION The salt-water content of crude oil cargoes poses a continuing problem for oil refineries. *rude oil washing reduces salt-water contamination of the cargoes, duereduction to the elimination of water from tanks and in the quantity of slops. 95

Inceased Caing Capacit

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In the 9/-/1-T/ procedures, the ship%s capacity to load new cargo is reduced by the weight of retained slops and sediments on board. *rude oil washing increases the effective cargo capacity of a vessel. Typical oil#water quantity for a ?2@,333-dwt tanker in the tanks as retained sediment is: fter water 2?33#2;33 tonnes appro. washing fter crude ;>3 tonnes appro oil washing : 5 O A LO.D generates its own load and *rude oilRwashing this usually occurs when personnel are occupied with cargo discharge. The overall time and effort applied to tank cleaning is much reduced, benefiting the ship%s personnel, thereby reducing to risks of pollution due to human error. ;5 CORRO,ION *rude oil washing reduces corrosion.

SAFETY PROCEDURES uring the process of crude oil washing, following safety measures should be strictly adhered to: 25 To prevent the escape of oil or vapour. ?5 To main tain the tank atmosphere within 1/1-&9B9) 9IIT7. ;5 To prevent the development of a source of ignition. <5 /il to be introduced into the tank for crude oil washing at a point outside the engine room. @5 ersonnel to be wel l trained and familiar with the crude oil washing, and possess thorough understanding of the entire operation. >5 6sually crude oil washing should be carried out in a port while the cargo is being pumped ashore. E5 7tage by stage cleaning of ta nks must be programmed. =5 Before clean ballast is loaded, tanks should be water-washed and the pumps and lines flushed with water. G5 *ontrol of atmospheric emissions is necessary by preventing ventilation of tanks. !ydrocarbons from tanks are not allowed to escape out into the atmosphere, nor is air allowed to enter from outside into the tanks. 235 ll crude oil washing opera tions must be entered in the /I9 ()*/( B//. Page $&



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225 fter crude oil washing, tanks must be washed with water and fully ventilated before being considered gas free and suitable for entry. 2?5 *autionary notes regarding non-opening of valves, no smoking and other safety measures, to be posted on board.

C,EC7L/ST 2 ? ;

BE1ORE .RRI0.L .T T$E DI,C$.RGING !ORT !as terminal been notifiedU K)7 Is /ygen analy+ing equipment tested and working satisfactoryU K)7 re tanks pressuri+ed with good quality Inert "asU 4aimum =A /OK")15U K)7

< @ > E

Is tank washing pipelines system isolated from water heater and engine roomU K)7 re all hydrant valves on tank washing line securely shutU K)7 reallvalvestofiedtankwashingmachinesshutU K)7 !ave tank-cleaning lines been pressuri+ed and leakages made goodU K)7

2 ?

IN !ORT Is quality of inert gas in tanks satisfactory 4maimum =A oygen5U IsInert"aspressuresatisfactoryU

2 ? ; < @ >

BE1ORE .,$ING revalvesopentomachinesonselectedtanksU re responsible persons positioned around the deck to watch for leaksU re tanks ullage gauge floats lifted on tanks to be washedU Is Inert "as system operatingU realltanksclosedtooutsideatmosphereU !avetankspositiveInert"aspressureU

2 ? ; <

D3RING .,$ING re all lines oil tightU retankswashingmachinesfunctioningcorrectlyU Is quality of Inert "as in tanks satisfactory 4maimum =A /OK")15U IspositivepressureavailableonInertgassystemU

2 ? ;

.1TER .,$ING re all valves between discharge line and tank washing line shut downU !as the tank washing main pressure been equali+ed and line drainedU realltankwashingmachinevalvesshutU

2 ?

K)7 K)7

K)7 K)7 K)7 K)7 K)7 K)7

K)7

.1TER ,.ILING !ave any tanks to be inspected been purged to below the *ritical ilution 9evel prior to introducing fresh airU !as oil been drained from tank washing lines before opening hydrants to deckU

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K)7 K)7 K)7

K)7 K)7 K)7

K)7 K)7

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/.ERT GAS SYSTEMS Inert gas is used to blanket some cargoes. *argoes, which react with air or water vapour in the atmosphere, must be loaded into a tank, which has been purged with I1)(T "7, and the tank must remain inerted until the tank cleaning has been completed. 7ome other cargoes have the ullage space inerted either as a fire precaution or to prevent reactions. !ydrocarbon gas normally containing encountered is petroleum tankers cannot burn in an atmosphere containing less than 22A of /OK")1 by volume. Thus, one way to provide protection against fire or eplosion in the vapour space of cargo tanks is to keep the /OK")1 content below =A by volume, which gives an adequate safety margin.  means of achieving this is by using a fied inert gas system connected by piping to each tank, which reduces the air content of the tank and makes the atmosphere in the tank nonflammable. 7uch an atmosphere is deemed to be CI1)(TD. !ence, introduction of inert gas into the cargo and surrounding void spaces, at all times, minimi+es the risk of eplosion or fire.

produced when carbon dioide is dissolved in water. Thus, the modern tankers avoid using carbon dioide and nitrogen for inerting the tanks, keeping in view the dangers and cost element. ;5 1L3E - G., The products of combustion of fossil fuels, provided that these are processed into an acceptable condition, are mainly used as inert gas. 7ources of such combustion gases are: a) Internal combustion )ngines like gas turbines and diesel engines. The products of combustion from such engines are not suitable due to ecessive oygen content. This problem can be overcome by employing an C&T)( B6(1)(D b5 Boilers c) Inert gas generators: These employ heavy fuel oil or diesel oil.

Pro"%tion O# /nert Gas

odern tankers employ the following two main processes for the production of inert gas: 25 7hips with main or auiliary boilers normally use the &96) "7, which contains only ?A to
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The design of any inert gas system must embody the following safety precautions: a5 revent the passage of hot, unwashed and wet gases to the deck main. b5 revent the return of hydrocarbon vapours and gases to the CsafeD +one.

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c5 The system must be capable of maintaining a positive pressure in the cargo tanks at all times, regardless of the cargo or ballast discharge rate. d) The cargo tanks must 1/T be capable of being /8)( ()776(IP) by the inert gas or by cargo vapours.

T*e &asi /nert Gas S(stems The basic inert gas system will consist of the following: 25 n inert gas source, that is, boiler flue gas or an inert gas generator. ?5  boiler flue gas valve at the uptake. ;5  scrubbing tower, which normally acts as a cooler. <5  demister unit. @5 Two electric motor or ste am turbine driven inert gas blowers complete with isolating valves. >5 n inert gas pressure-regulating valve. E5  means of sta bili+ing the pl ant on sta rtup, which also serves the purpose of maintaining a minimum inert gas flow through the scrubber and blowers. This may be either a gas =5 recirculating line or a bleed-off line at atmosphere, which incorporates, some form of control valve. G5  liquid non-return device, 4deck seal5, in the inert gas main, The deck seal and seal water supply line are to be fitted with means to prevent free+ing of the water. 235  mechanical non-return device in the inert gas main. 225  deck main with branch line s for delivery of inert gas to the various cargo tanks. )ach cargo tank will be capable of being isolated from the deck main. The deck main is to be fitted with isolating valves if the mechanical non-return valve is not of the positive closing type. The deck main is also fitted with drain valves sited at suitable points.  vent line and valve is fitted in the main at some point between the gas regulating valve is open when the inert gas plant is not in use. 2?5  means to prevent ecessive pressure or

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4other than the inert gas main5, which passes through the safety barrier and through which hydrocarbons could pass, are also fitted with C6D seals.

9Poll%tion &( S*i's5 O'erational An" Ai"ental In the lat one hundred years, in the so-called Hage of oil%, escapes of oil into the environment has increased in quantity and has become ob$ectionable, and so, Hoil pollution% has arrived. In 2GEG the oil production was ;333 million tons. t every stage of its transportation, oil can escape into the sea from ships. The two main causes of sea pollution by tankers are:  ccidental pollution  /perational pollution

Ai"ental Poll%tion uring a voyage of an oil tanker while conveying the oil to the refineries, accident can occur, such as collision between two tankers or grounding of a tanker due to a 1avigational error. Both these can result in seepage of oil into the sea. The two important incidents that resulted in etensive sea pollution are the grounding of the HTorrey *anyon% and the Hmoco *adi+%. The effect on the environment due to these accidents has been catastrophic and the cost for cleaning up was huge. G;A of oil over @333 bbl is a result of grounding or collision.

O'eration Poll%tion But by far the highest percentages of spills are caused due to operational reasons, associated with: a5 Tank cleaning with water b5 9oading and discharging c5 Ballasting and deballasting Thus, in complete round trip of a tanker oil can enter the sea due to a number of operational

vacuum building up in the deck main and causes reasons. ofIn the the following some are of operationalpages pollution individual cargo tanks, that is, #8 breather highlighted and eplained. valves and #8 breaker. 2;5 C6D seals and siphon breakers are fitted to the scrubber tower effluent line deck seal drain line, deck seal water supply line. nd line

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Mis%"ging T*e Filling Rate widely different loading rates without incident any tank overflows occur simply because and without any sense of urgency. ships% personnel mid$udge the filling rate 4i.e., F%el Oil Loa"ing the rate at which the tank ullages change5 but not infrequently this mis$udgment is associated !eavy fuel oil presents a special case with with an unepected change in the filling rate. regard to varying loading rates, for if the contents of the shore lines are inadequately These changes can arise from operational heated, or in particular, if failure of a section of changes on shore - for eample, changing steam trace leads to the formation of a Hcold from low to high level tanks or from a for the a plug% the initial loading rate will be etremely near tank, both of which can result in an low until the relatively cold oil is displaced from increased loading rate. the line , where upon the rate will increase They can also arise from aboard activities such as closing down tanks as they top off or transferring from loading a large tank to loading a small tank. 7ome authorities seek to overcome this problem by recommending loading all tanks initially to ullage short of the final ullage and thereafter topping off each tank individually at reduced loading rate. !owever, this is Hhaving two bites at the cherry% and does not guarantee against overflows during the initial loading phase. n alternative, practiced by many eperienced tanker men, is to open up as many tanks as possible consistent with stability and stress as by so doing the filling rates of individual tanks, and thereby the effect of changes in loading rate, are minimi+ed. The filling rates to individual tanks are so arranged that tanks reach completion ullage in sequence and the time interval between completion of one tank and completion of the net is sufficient to allow a check that follow into the tank $ust completed has ceased. 1ormally trim plus the varying lengths of line serving the tanks effects the stepping of levels automatically but if the difference in levels is considered in adequate it is increased by partly closing selected tank valves.

dramatically. This sudden increase can catch ships% staff off guard and is particularly serious when loading bunkers to capacity, which operation involves filling double bottom and deep tanks. The best way to guard against mishaps under these circumstances is to ascertain the capacity of the shore line in advance and direct the contents of the line into one of the main tanks before embarking upon topping off the smaller and more difficult tanks.

Lea!s From Mani#ol" Flanges 9eakage of oil from manifold $oints is not only common but can be etremely messy should the $oint fall completely under pressure, for the oil is then sprayed into the air and spreads over a wide area of the deck and superstructure. There are two kinds of failure failure of a blank securing a manifold not in use, and failure of the $oint between hose or flow boom and manifold flange.

Over#illing Slo' Tan!s

s the first group of tanks fill and are shut off other tanks in the net group are opened in order to maintain an acceptable filling rate.

The possibility of overflowing slop tanks through valves left open to the main line has been mentioned already, but these tanks can also overflow from the oil introduced during stripping and operations. The introduction of eductors for stripping and crude washing has added a new dimension to this problem.

The rate into the final group is ad$usted by bleeding off to one or emptier tanks, which are reserved for that purpose and used finally as balance, or completion tanks. 6sing these techniques product vessels have repeatedly loaded three and four grades concurrently at

In the older type of system, based on positive displacement pumps, only the oil from the tank being stripped entered the slop tank and it was usually sufficient precaution to lower the level to half tank before commencing stripping

ALAM/July 2002

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operations. 'ith eductors the drive liquid as well as the stripping liquid enters the slop tank and the drive liquid continues even when the cargo tank being stripped is empty. *rude washing adds a further complication because the oil used for washing plus the oil used to drive the educ tor is discharged to the slop tank. The situation can be alleviated by lining up the cargo pump supplying drive and washing liquid to take suction only from the slop tank, in case the net inputfrom to the willwhich be the normal stripping theslop tanktank being washed. This technique, however, is not always feasible. n alternative is to discharge the slop tank to a low level prior to start of stripping and then, when the eductor discharge has stabili+ed, crack open the slop tank suction until the tank level remains constant or falls slowly. !owever, even with this technique there can be no guarantee that the tank will not gain liquid as the discharge progresses and the only way to prevent an overflow is to keep the tank under constant observation.

Containment O# Oil On De! /il escaping on to the decks, from whatever source, does not become polluted until such time as it flows overboard on to the water alongside.

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regulation is only partly effective for there have been several instances of oil escaping overboard before the scuppers would be resealed and others in which rain has subsequently waterlogged the decks and carried the oil overboard.

Terminal Sta## In this matter terminal staff can play a useful role by recogni+ing that strangers to the terminal pose a potential pollution risk, which requires special attention on their part. They must be prepared to allow such vessels etra time to double check line-up before embarking upon cargo operations and, in so far as they are able, back up the ship%s staff by carrying out their own check. bove all they must recogni+e that such vessels cannot be epected to perform safely as efficiently as regular traders and take care that they do not inadvertently pressuri+e the vessels into embarking upon operations beyond their capabilities. !owever, regardless of caliber and eperience, no vessel can claim immunity from the possibility of a mishap during cargo operations and if the consequences of such mishaps are to be minimi+ed careful attention must be paid to emergency procedures and contingency plans must be introduced to deal with any spillages which may arise.

Emergen( Proe"%res

ost regulations recogni+ed this fact and seek to confine the oil onboard, pending its removal, by calling for deck scuppers to be securely plugged throughout the vessel%s time alongside. !owever, for this regulation to be effective there must be a sufficiently high up stand at the ship%s side to contain the oil and this is by no means always the case. It will be appreciated that many modern vessels, including 89**s, have similar small up stands. 1or is the regulation effective if the decks become waterlogged from heavy rain, which carries the oil over the top of the up

To be effective, emergency procedures must involve the whole crew regardless of rank or rating and, in the absence of a responsible officer, individual crew member, must be vested with the authority to order an emergency stop should they have reason to suspect that all is not well. They should, if necessary, to be permitted to actuate the onboard main pump emergency stops and stripping pump controls themselves.

stand.

position to $udge between the normal and the abnormal, and thereby act responsibly, they should be instructed in basic cargo handling techniques.

This fact is also recogni+ed by the regulation which call for a crew member to be stationed at the aftermost scuppers in order to periodically drain off the water, but again the

ALAM/July 2002

!owever, in order that crewmembers not normally involved in cargo operations are in a

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Cargowork

They should also be shown the locations of the pump emergency stops and steam pump Some O# T*e Proe"%res controls and told how to coach instructions to A"o'te" To Prevent the shore in such a way that there can be no O'erational Poll%tion misunderstanding between their request for an emergency stop and a normal request for 25 9oad on top system stopping cargo. ?5 edicated clean ballast tank system It is essential that these on-board procedures 4*BT5 are communicated in writing to the shore staff prior to the start of cargo operations and they ;5 7egregated clean Ballast tank system 47BT5 should be advised that in the matter of emergency stops they have theof master%s authority to act on the instructions anyone on board ship.

<5 *rude oil washing system

@5 7hore reception facilities for receiving oily# t the same time it should be made clear that water moistures the procedure relates only to emergency stops and that only the officer of the watch or other >5 /il content monitors#control system, oily designated crew member has the authority to water separators start cargo operations. To avoid possible confusion the //' or designated Some O# T*e Re$%irements crewmember should identify himself To Prevent Ai"ental personally to the shore staff where taking over Poll%tion; Aboar" Tan!ers the cargo watch. 25 utomatic radar plotting aids 4(5

Contingen( Plans *ontingency plans should be based primarily upon the need to clean up a spillage on deck with the utmost dispatch in order to prevent the oil escaping overboard and creating pollution. They should, also provide contingencies for emergencies such as cargo valves failing to close correctly when topping off tanks, etc.

?5 dditional radar on certain si+e of tankers ;5 7pecial steering gear arrangements

They should also incorporate on-board training programmed whereby the ship%s personal receive practical instruction and the effectiveness, of the laid-down procedures is tested. These procedures should not be considered sacrosanct and if they are found to have outlived their usefulness in their present from they must be changed or discarded.

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Cargowork

A.T/-POLLUT/O. OPERAT/O.S SE3UE.CE - /. PORT IT)7

()(TI/1

7hip Board ersonnel

lanning Transfer

Terminal

*heck repare equipment

7hips moorings 7cuppers riptrays 7eavalves !osearms

*argo system *argotanks

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*ommunication )mergency rocedure *ontainment shore persons in-charge

6(I1"*("/ T(17&)( 'atch eeping /perational *hecks

*/9)TI/1# 7)*6(I1" *learing ecks eparture

7pill containment onitoring $etty

7tow !oses

dequate

dequate for tide weather lugged )cesswaterdraining 6nplugged Inposition eans available for rained draining ecess water 7ecured Ballast "ood condition 7ufficient length rained &irmly secured isconnected Blanked *hecked roperly l ined u p f or 7hut down transfer anifolds blanked 6llagesmonitored rrival #ort *ommence Transfer 7ailing *heck lists

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Cargowork

STAT/C ELECTR/C/TY A.D STRAY CURRE.TS /ntro"%tion In special conditions, which favor the generation of electrostatic charges and their collection on some ob$ects, the discharge of the accumulated charge as a spark can ignite flammable vapour. These conditions can arise in tanker operations and steps have therefore to be taken to minimi+e the generation of static and to avoid accumulation of static charges on any ob$ect within a flammable atmosphere.  brief eplanation of the mechanism of charge generation, and of static discharge, and the ignition of flammable atmospheres by static is therefore given so that the reasons for the operational safety procedures in the various stages of petroleum liquids handling may be better understood.

Stati Generation 'henever unlike materials are in contact, some transfer of electric charges takes place across the interface or there is some accumulation of electric charges at the interface0 this occurs for solid#solid, liquid#liquid, solid# liquid and liquid#gas interfaces, and is of no practical significance until the surfaces are separated from each other. )lectric charges are then carried away by the separating materials and become evident as static electricity, positive charge being carried away by one of the materials and an equal amount of negative charge by the other. The word Hstatic% is used to differentiate between this kind of electric charge and the more familiar form, in which a continuous supply of electricity flows steadily in a conductor.

7ettling of droplets of one liquid through another, e.g. water droplets separating out in a tank containing petroleum liquid,  Breaking up of liquid in free fall, e.g. during overhead filling of tanks0  7praying and splashing by the break-up of $ets or bubbles, e.g. during splash filling of 

tanks and high speed e$ection of liquids from no++les0  impingement of solids on solids, ).g. during sand blasting. *ompared with the electric currents carried in conventional electrical equipment, the quantities of electric charge transferred in electrostatic generation are very small indeed, but they can give rise to very high voltages when they accumulate on electrically insulated bodies. Because of this high voltage and the small quantity of charge involved, static electricity quickly leaks away unless prevented by very high electrical resistances 4of at least 23= ohms5. The strength of the electrostatic voltage therefore depends on the electrical conductivity of the materials involved and is the net result of the rates at which charges are generated and are able to leak away. If the material has a high conductivity, e.g. crude oils and residue fuels, the charges leak away as quickly as they are formed, whereas refined distillate products, which in general have relatively low conductivities, can accumulate considerable amounts of static charge.

C*arges Can A%m%late

/n insulated conductors0 )amples of separation processes causing  In low conductivity petroleum passing through pipes and filters0 electrostatic generation are:  In mists and sprays of conducting or non assage of liquid through pipes and filters, conducting liquids where the charged droplets e.g. during fueling of vehicles and loading of tanks. are insulated by air.  7ettling of solid particles0 in liquids, as Stati Dis*arge when rust and sludge particles settle in a tank0 If a conducting body, e.g. a metal storage tank or metal pipe is in contact with the ground or

ALAM/July 2002



Page %$



connected electrically to earth, static charges are conducted harmless to earth and therefore cannot accumulated on the body. Because most refined petroleum liquids are poor electrical conductors any accumulated electrostatic charge on such liquids cannot be quickly discharged by having the tank containing them connected to eart h. The charge on the liquid will either gradually leak away to earth or recombine with the charge of opposite sign from which it was separated in the static generating process. In a static generating process, e.g. filling an unearthed metal tank with a refined petroleum liquid through an unearthed metal pipe which is not in contact with the tank, any possibility of accumulation of opposing electric charges, i.e. charges of opposite sign, on the surfaces of the fill-pipe and the tank can be avoided by making an electrical connecting between them, i.e. bonding them together, so that the separated charges are re-united through the bond as fas t as they appear. Bonding, however, does not reduce the charging of the liquid itself and if there is a heavy char ge accumulation within the liquid a static discharge might possibly occur between the liquid surface and any conducting ob$ect near it. The charges, which accumulate on insulated conductors or insulating materials, such as poorly conducting liquids, may set up high electrostatic voltages. If these voltages eceed the appropriate critical value for the surrounding medium, the electrical resistance of the insulating medium breaks down, and there is a rapid discharge of electricity in the form of a spark. 6sually the discharge takes place in air or, when petroleum liquids are being handled, in the vapour space above the liquid, but static discharges also occur within liquids, mists and stream clouds. In air, the critical breakdown value is about ;,333 kilovolts per meter0 up to this value, air is an effective insulator. )lectric charges, which accumulate on a body, may therefore be:

ALAM/July 2002

Cargowork

ischarged harmlessly to earth0 1eutrali+ed by recombination through a bonding connection0  ischarged as a spark through the medium surrounding the charged body, when the electric field strength eceeds the breakdown value of the medium.  

/gnition O# Flammable Atmos'*eres Before a spark can ignite a flammable petroleum vapour#air miture it must release sufficient energy 4at least 3.? mill $oules5 but if ignition does occur within a restricted space containing petroleum a serious eplosion can result. The infrequency of such eplosions in the course of handling petroleum liquids suggests that:  7tatic sparking is relatively rare0  any static sparks are of low energy0  t the time and place of discharge of a static spark capable of igniting the surrounding atmosphere there was no flammable petroleum#air miture being either too weak or too high.

TA.7ER OPERAT/O.S Loa"ing an" Dis*arging The flow of electrostatic charge during loading of a tanker is shown diagrammatically in &igure 2. s the oil flows along the shoreline electrical charge of one sign 4say negative5 separated from it and accumulates on the pipe, which would therefore become negatively charged if it were not connected to earth. s it is earthed, this negative charge, indicated by a bracketed 4-5 sign, in fact flows to earth and, for practical purposes is lost. The liquid, which was srcinally electrically neutral, now carries a positive charge into the ship. The hull of the ship collects positive charge from the liquid but, the ship is floating in water, which whether it is fresh or salt, readily conductsby static the positive charge, denoted 4N5 incharges, the diagram, travels through the water to earth where it too is lost. Both ship and shore are therefore at earth potential 4apart from any cathodic protection

Page %%


voltage5. nd no electrostatic between the ship and the $etty.


can eist

The length of time the charge is retained by the liquid depends on its electrical conductivity but even with light petroleum distillates, which in general have relatively low conductivities, the time required is usually of the order of a minute or less. )ceptions are, highly purified hydrocarbons and also where high concentrations of water are dispersed within cargoes of light petroleum distillates. Then, a

Cargowork

edge of the opening, i.e. earthed, a spark could occur between the bob and the surface of the liquid. I the tape is held clear of the opening 4i.e. not earthed5 until the bob is immersed in the product, the charge collected from holding the tape or, if he is insulated from the deck, discharge as a spark between the tape and the tank opening. 7imilarly a metal sampling CcanD could collect charge when immersed in the product and create by discharging to the tank structure inside the tank or to the rim of the tank

significant be of observed for up to ;3 minutesvoltage sue to may settling water through the opening as it is withdrawn. oil. s any isolated metal ob$ect can act as a charge collector, particular care should be The normal precaution taken to keep taken after a dry-dock period to ensure that electrostatic generation down to an acceptable ob$ects, such as tins, which might float about level is to keep the linear rate of flow of liquid in the cargo, are removed. below a specified value, which is frequently taken as E meters#second. This level is, ,ose &on"ing however, considered to be too high when The accumulation of electrostatic charges on there is a large amount of free water mied metal hose couplings is normally prevented by with the oil, as the presence of water droplets connecting the couplings to earth through the increases charge separation in flow through internal bonding wire in the hose. 'ithout this pipelines and pumps as well as settling of the bonding wire, intermediate coupling in a hose water through the oil in the tank. In the initial string could be isolated from earth, even stages of loading when water that may have although the end couplings are earthed, and collected in pipelines or at the bottom of a tank could therefore collect electrical charge from may be disturbed the linear rate of flow is the liquid flowing in the hose. 7uch isolated generally restricted to 2 meter#second until the bottom girders of the tank are covered. This also helps to reduce splashing and spray formation, which is another charge separation process.

Ullaging an" Sam'ling 'hen loading clean products it should be assumed that static electricity could be generated. 7afety regulations therefore require that no conducting ob$ect be introduced into a tank, which loading is in progress and a ;3-minute delay period is necessary on completion to allow for the dissipation of any static electricity. To obviate this, clean product vessels are supplied with linen tapes to be used in con$unction with a circular wooden float, to enable bilges to be taken when the level of liquid is below convenient gauging by a wooden ullage stick. If a conducting metal dip tape is lowered through a deck opening into a tank containing a charged product so that it is contact with the

ALAM/July 2002

couplings might acquire a high static voltage and provide a spark by discharging to any nearby earthed conductor.

Tan! Cleaning The precaution of not introducing an isolated conductor into a tank applied to tank washing machines0 the machine itself and all metal couplings on the hose are bonded togeth er and earthed through the integral bonding wire in the hose. uring water washing the machine is in fact earthed via the seawater slowing through the hose. The amount of static produced by water washing is very small. 7teaming tanks is potentially dangerous as an electrostatic charged mist may be produced and where steaming out is necessary the steam should be introduced at low velocity to lessen the charge separation.

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1o tank washing machine or other earthed conductor should be permitted in a tank when steam is present, as a spark discharge may occur between the steam cloud and the machine. s any in earthed conductor might accumulate a dangerous static charge, unearthed conductors should be banned if steam is present.

Loa"ing Overall 9oading overall of volatile petroleum is not

Cargowork

according to its material of construction. In either case, the voltage in the system is quite small, of the order of a volt, but the current transferred can amount to many amperes. 'hen a ship alongside the $etty and hoses are rigged for the transfer of cargo, the cathodic protection current automatically etends to the shipside it is electrically connected to the $etty by the built-in bonding wire in the fleible hoses. This is illustrated in figure ?b, which shows that the internal bonding wire must

permitted because of the possibility of electrostatic charging occurring in the presence of flammable gas. 9ikewise, nonvolatile products may be loaded overall only if the tanks are gas-free and provided there can be no contamination with volatile petroleum, which would give a flammable atmosphere in the tanks. The ha+ard is similar to that of a steam cloud in that charges mist may be produced, not only with the clean products normally regarded as static procedures, but with other kinds of petroleum as well.

carry on the its return the source voltage, current$ourney that hastotraveled fromofthe anode to the ship.

'ater should not be loaded into a tank which has contained volatile clean oil until after the tank has been stripped because large static voltages could be generated by water droplet settling through the oil layer, if this is of any depth, and the tank could be in a flammable state.

7imilarly, electrical currents may result from ship%s eternal cathodic protection system, which protects the ship%s hull from corrosion. nother source may be current leakage from electrical installations ashore.

STRAY CURRE.TS Cat*o"i Protetion C%rrents In order to prevent corrosion, $etties of metallic construction are provided with a cathodic protection system, which maintains the $etties at an electrical potential slightly negative to the water in which they are imme rsed. This is done by making the $etty one electrode 4the cathode5 in large electrolytic cell, as illustrated in &igure ?a. The other electrode 4the anode5 may be a mass of a suitable dissimilar metal, such as magnesium, which maintains a voltage difference between itself and istheitself $etty by electrochemical means, and consumed in the process. lternatively, the required driving voltage may be provided from a suitable eternal power source through an electrode, which may or may not be consumed

ALAM/July 2002

The current in the internal bonding wire may amount to as much as @3 amps or even more and when such a circuit is made or broken heavy sparking will result. If therefore introduces and ignition ha+ard through arcing when the hose connection is made or broken at the ship%s manifold in the presence of hydrocarbon gas.

The solution to the problem of stray currents is to block their passage completely by means of an insulating flange in the loading line, as illustrated in &igure ;. 7ince no current can now flow in the internal bonding wire, hose connections can be made and broken at the ships manifold without any risk or arcing. The same result could be achieved by using hoses without an internal bonding wire but where more than one length is used0 the risk from static charges on isolated intermediate hose couplings again arises. This however becomes a problem only when the hoses are used for pumping clean oils. It should be noted that when an insulating flange in the loading line all parts of the hoses system remain securely earthed, either from the flange shoreward or from the flange in the opposite direction to the ship.

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&ull protection against strays current without detriment to precautions against static electricity, is therefore provided by a single insulating flange in the loading line.

Se'arate &on"ing 0ire The use of a separate bonding wire between ship and $etty, formerly required at most installation, is now being discontinued as investigation of its effectiveness has shown that it serves no useful purpose.

Cargowork

7o far as static electricity is concerned, the separate bonding wire plays no part as no electrostatic potential eists between the ship%s hull and the $etty because both are in contact with the water. The separate bonding wire therefore serves no useful purpose either in dissipating static electricity on the $etty or the ship or in preventing stray current from flowing through the internal bonding wire in the loading line.

The intended purpose of the wire was to shortcircuit any stray current flowing between ship and shore so that the loading line could be connected and disconnected safely without risk of arcing. To be effective the total resistance of the wire and the contact resistance of the flameproof switch and connecting clamp need to be of the order of 3.332 ohm. This would require a wire of a very large diameter, even if contact resistance could be reduced sufficiently, and indicates that the separate wire as normally used cannot be relied upon to perform this function. 'here installations still insist on the use of the separate bonding wire the proper procedure must be followed in connecting and disconnecting so that arcing does not occur at the ship%s side but within the flameproof switch. It should be the first electrical connection made between the $etty and the ship, and the last one broken, the circuit being completed at the flameproof switch so that the resultant spark cannot ignite any flammable vapour that may be present and so propagate an eplosion.

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Cargowork

C,EM/CAL CARR/ERS E4trat o# /MO Co"e #or t*e Constr%tion an" E$%i'ment o# S*i's arr(ing Dangero%s C*emials in &%l! 1

?5 ;5 <5 @5

*hemical cargoes carried onboard tankers today include solvents, heavy chemicals, acids, alkalis, alcohols, additives, vegetable and animal oils and molasses.

 chemical tanker may be damaged as the result of a collision, stranding or from some other circumstances, which may lead to an uncontrollable release of cargo. *onsequently

These cargoes may possess one or more of the following properties, which influence the design of the ship: 25 !igh 7pecific "ravity up to ?.? ?5 !igh viscosity ;5 !ighly corrosive <5 oisonous @5 &lammability >5 7elf-reactive E5 !eat sensitive =5 !igh heat required to prevent solidification G5 !ighly sensitive to impu rities because of possible reaction or cargo impairment. The I/ code applies to bulk cargoes having fire ha+ards in ecess of petroleum, or having significant ha+ards other then flammability.

!ealth ha+ard 'ater pollution ha+ard ir pollution ha+ard (eactivity ha+ard

to afford the cargo containment system some protection from eternal damage, consideration must be paid to the sitting of the cargo tanks in relation to the ship%s sides and bottom. In order to determine the criteria for cargo tank sittings and ship stability, it is necessary to define the assumed damages and to state the conditions of survival and of cargo containment.

DAMAGE ASSUMPT/O.S 25 Collision Da%age 9ongitudinal etent 2#; 9 or 2<.@ m whichever is less Transverse etent B#@ or 22.@ m whichever is less 8ertical etent

The purpose of the *ode is to recommend suitable design criteria, constructional standards and other safety measures, for ships used in transporting dangerous chemicals in bulk so as to minimi+e the risk to the ship, its crew and to the neighborhood. The *ode provides for three types of ships, Type I, II and III, corresponding to three classes of ha+ardous chemicals. Type I Type II Type III

is the %ost ha+ardous is the %odeate ha+ard is the least ha+ardous

The ship type classification is based on the ship%s ability to survive specific etents of damage, and to prevent or limit the cargo release and also is influenced by the ha+ards associated with the release of a particular cargo: 25 &ire ha+ard

ALAM/July 2002

&rom upwards limit.

baseline without

?5 ,tanding Da%age 9ongitudinal 9#23 for 3.;9 from the forward etent perpendicular0 and 9#23 or @ m 4whichever is less5 over any other part of the ship Transverse B#> or 23 m 4whichever is etent less5 for 3.; 9 from the forward perpendicular0 and @ m over any other part of the ship. 8ertical &rom baseline upward ;#2@ etent or > m whichever is less. ;5 Mino Da%agewhich may occur during This is damage, harbor maneuvers due to tugs, piers, etc. The transverse etent, inboard from the sip%s side, at right angles to the center line, at the

Page &1



level of the deepest load line is taken as E>3m.

S*i' T('e / Is designed to transport products, which require maimum preventive measures to preclude the escape of the cargo. The ship should be capable of sustaining or stranding damage anywhere along her length. Tanks designed for cargoes in this type of ship must lie outside the etent of damage specified0 in collision damage - transverse etent, and stranding damage - vertical etent, and must not be closer to the ship%s shell than E>3 mm.

S*i' T('e // It is designed to transport products, which require significant preventative measures to preclude the escape of the cargo carried.

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TA.7 TYPES /ntegral Tan!  cargo containment envelope, which forms part of the ship%s hull, and may be stressed in the same mann er and by the same loads, which stress the contiguous hull structure. n integral tank is essential to the structural completeness of the ship%s hull.

/n"e'en"ent Tan!  cargo containment envelope, which is not a contiguous part of the hull structure. n independent tank is built and installed so as to eliminate whenever possible 4or in an event, to minimi+e5, its stressing as a result of stressing or motion of the ad$acent hull structure. n independent tank is not essential to the completeness of its ship%s hull. 4Hcontiguous% means Htouching% or ad$oining5

 ship of 2@3 m or less in length, should be capable of sustaining damage anywhere in her Gravit( Tan! length, ecept involving either of the Tank having a design pressure of not greater bulkheads bounding a machinery space than 3.E p#cm? at the top of the tank. ay be located aft, and surviving as specified. integral or independent.  ship or more than 2@3 m in length should be capable of sustaining collision or stranding damage anywhere along her length and surviving as specified. The tanks should be located outside thecontaining etent ofcargo damage specified0 in stranding damage - vertical etent, and minor side damage.

S*i' T('e /// Is designed to carry products having sufficient ha+ards to require a moderate degree of containment, to increase survival in a damaged condition.

S,/P ARRA.GEME.TS Cargo Segregation  cargo sub$ect to the *ode shall be segregated from and machinery boiler drinking spaces, accommodation serviceand spaces, water and stores for human consumption0 by means of cofferdam, void space, cargo pump room, empty tank fuel tank or other similar spaces, ecept where otherwise ecluded by the *ode.

*argoes, which react in a ha+ardous manner with other cargoes should: a5 Be segregated from such other cargoes by  ship of 2?@ m and over in length, should be means of a cofferdam, void space, cargo capable of sustaining stranding damage pumproom, empty tank or mutually compatible anywhere along her length, ecept inclosing cargo0 b5 !ave separate pumping and piping as specific.  ship of less than 2?@ m in length, should be capable of sustaining systems, which should not pass through any collision or grounding damage anywhere along other cargo tanks containing such cargoes, unless encased in a tunnel0 and her length and ecept for damage in way of c5 !ave separate tank vent systems. machinery space, survive as specified. There are no special requirements for cargo tank location in Type III ships.

ALAM/July 2002

*argo piping should not pass through any accommodation or machinery space other than cargo pumprooms.

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 cargo sub$ect to the provisions of the *ode should not be stowed in the fore and after peaks.

Aess To +oi" S'aes Cargo Tan!s An" Ot*er S'aes /n T*e Cargo Tan! Area

Cargowork

above such gangway, if vent is fitted within < m of such gangway. The height of vent eit may be reduced to ; m above deck fore and aft gangway, provided high velocity vent valve are fitted, directing the vapour#air upward in an unimpeded $et with an eit velocity of at least ;3 m#s.

rrangements for void spaces, cargo tanks and other spaces in the cargo tank area, should be such as to ensure adequate access

The vent eist should be at least 23 m from nearest air intake or opening in accommodation, service, spaces and ignition

for complete inspection.

sources. outlets be provided &lammable with readily vapour renewable andshould effective flame screw or safety heads of approved type.

ccess to the cargo tanks should be direct from the open deck. &or access through hori+ontal openings dimensions to be such as to permit passage of person wearing breathing apparatus, and allow the hoisting of an in$ured person from the bottom of the space. inimum clear opening to be >33 mm  >33 mm. &or access through vertical openings, providing passage through length and breadth of the space, the minimum clear opening shall be >33 mm  =33 mm, at a height not more than >33 mm from the bottom shall be plating, unless gratings or other footholds are provided.

Tan! +ent S(stems

Materials O# Constr%tion 7tructural materials used for tank construction, together with associated piping, pumps, vents, valves and their $oining materials, should be suitable at the carriage temperature and pressure for the cargo to be carried. 7teel is assumed to be the normal material of construction. 'here applicable, the following should be taken into account in selecting the material of construction: a5 1otch ductility at the operating temperature0 b5 *orrosive effect of the cargo0 c5 ossibility of ha+ardous reactions between the cargo and the material of construction0 and d5 7uitability of linings and coatings.

ll cargo tanks should be provided with a venting system appropriate to the cargo being carried. 7ystems to be so designed as to minimi+e the possibility of cargo vapour accumulating about the decks, entering Ma4im%m Allo)able accommodation and machinery spaces, and in 3%antit( O# Cargo Per Tan! the case of flammable vapours, other spaces The quantity of cargo, required to be carried in containing sources of ignition. They should a Type I ship, should not eceed 2,?@3 cubic also be designed to minimi+e possible meters in any one tank. spraying on deck. The quantity of cargo, required to be carried in Tank vent outlets should be arranged to a Type II ship, should not eceed ;,333 cubic prevent entrance of water into the cargo tanks, meters. and at the same time, should direct the vapour discharge upwards in the form of unimpeded Certi#iate O# Fitness For $ets.

+ent E4its

T*e Carriage O# Dangero%s C*emials /n &%l!

The height of vent eits should not be less than < m above the weather deck or, if a fore and aft gangway is fitted, not less than < m

fter satisfactory inspection of a ship, a certificate should be issued, containing the following information: -

ALAM/July 2002

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a5 1ame of ship b5 ort of registration c5 7hip type d5 *argoes which ship is permitted to carry e5 The conditions of carriage f5 ny authori+ed eemptions permitted by the *ode.

C*emial Tan!er ,aar"s *hemical tankers differ substantially from oil tankers in the type of operation as they are requires to handle a large number of small parcels of differing chemicals on a continuing basis, rather than alternating between oil and ballast voyages. The chemical tanker operation involves frequent cleaning and inspection of the tanks to maintain the highgrade quality of the product and to prevent any interaction of the chemicals.

Prini'al ,aar"s For Cre) The principal ha+ards to which crewmembers are eposed in handling chemicals in this condition are:  Tank eplosion  Tank over pressuring  sphyiation  olymeri+ation  *hronic and acute poisoning

Tan! E4'losion )plosion occurs when an air#fuel miture within certain specific concentration is ignited.

Cargowork

to about <3 different tanks, each with its own system. fter each product has been off loaded the tank is frequently ventilated and then washed, sometimes only with a bottom flush. !owever, because even the tank drainage can be sufficient to put a chemical off specification, it is necessary to enter the tank to mop out the draining prior to tank inspection by second person. Incidents tanks of chemical and otherof asphyiation tankers are in unfortunately too frequent.

Pol(meriation If a tank containing a monomer starts to polymeri+e heat is liberated which can accelerate the reaction. onomer can then be vapori+ed which can lead to tank overpressure and rupture. olymeri+ation of a monomer can be caused by impurities either in the tank at the start or introduced subsequently by, for eample, inert gas. )clusion of oygen, making the polymer inhibitor ineffective, will aggravate any problems of impurities.

L/3U/F/ED GAS CARR/ERS 25 1"ll !ess"ised ,#ips These ships carry cargo in steel pressure vessels designed to withstand about 2E kg#cm . The tanks are normally cylinders, mounted hori+ontally or vertically. The ships tend to be small, with a cargo capacity of up to about 2333m; and they normally carry 9" or ammonia in the short sea trade. 

Tan! Over Press%ring Tank over pressuring leading to rupture can be caused from hydraulic or gas pressure effects and when the tank relief system is inoperable. ressuring of a ships tank by, for eample, inert gas will tend to increase any leakage from a tank and sub$ect crewmembers to a ha+ard unless the pressure tightness of the tank is ensured.

As'*(4iation /ne particular aspect of chemical tanker operation, which differentiates it from product and oil tankers, is the frequency of ventilating and cleaning tanks. *hemical tankers have up

ALAM/July 2002

?5 ,e%i Refigeated ,#ips These ships have pressure vessels designed to carry cargoes at temperatures below ambient. The grade of steel used governs the temperature limitation. The trend to be larger ships with cargo capacities of up to 2?333m ;. The cargo tanks are insulated and there is usually a reliquefaction plant on board. ;5 1"ll Refigeated ,#ips These are larger ships of cargo carrying capacity varying from @333m ; to 233,333m;. They carry 9" at temperatures between -

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Cargowork

@@°* and - 3.@ °*. The tanks are made of carbon - manganese steel and are insulated. There is a reliquefaction plant on board. rismatic freestanding tanks are the most common and the hold is generally insulated. <5 Et#lene ,ips The cargo is usually fully refrigerated at 23<°*, and the tanks are made from aluminum, nickel steel or stainless steel. They are insulated and a reliquefaction plant is fitted. ships tend to befrom speciali+ed ; cargo These capacities varying 2333mwith 2?333m;.

CARGO TA.7S The cargo tanks on 9" and 91" ships are divided into threetanks groups. a5 Independent b5 embrane or 7emi embrane tanks c5 Integral Tanks a) Independent tans +) Tpe . Tan These are independent rectangular and prismatic tanks which support their own weight and the weight of the cargo, which is carried in a refrigerated, or semi refrigerated condition. ) Tpe B Tan This is a low pressure tank based on pressure vessel design, is normally spherical in shape and made from aluminum alloy or GM nickel steel. 2) Tpe C Tan This type of tank is basically a pressure vessel, and is either cylindrical or spherical in shape. It is used either with fully pressuri+ed or with semi refrigerated cargoes. ') Me%'ane T an This type of tank has a primary barrier made of a thin material, which is supported by the inner hull via insulation. HTechnigas% and H"astransport%. embranes are some of the latest designs. These tanks are very large and do not have centerline bulkheads.

@5 L!G& LNG ,#ips The cargo is carried fully refrigerated at 2>;°*. The cargo tanks are either selfsupporting or membrane type and are made from aluminum, nickel steel or stainless steel, and are insulated. "enerally a reliquefaction plant is not fitted. The Hboil off% gas is either vented or burnt in the main machinery. These ships are large with cargo capacities varying from <3,333m; to 2;@,333m;.

ALAM/July 2002

c) Integal T ans These tanks form part of the ships hull. 1ormally the design pressure is 3.?@ kg#cm and under normal circumstances the temperature should not fall below - 23°*.

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