.....• . ~
ANCHOR HANDLING
ANCHOR HANDLING By
Capt.Krets Mamondole Master Mariner. MNI.DPO
Editor
Capt. Abdul Ghani Thalib Omkar Barve Cover Designed
Denny Rozali
Published by
Yayasan Sinergi Refonnata
First Printing: August 2009 ISBN 978-602-95432-1-6 Printed by
Harapan Jaya
This book or part thereof may not be reproduced in Any form without permission of published
Preface I believe that the core idea of offshore operation to make relatively simple for any inexperience mariner to understand simple drawing sketch and steps to understand the flow of operation safely. Many have misunderstood and this easi ly overlooked and causes more hann in gelling work done in safely instead . In writing this textbook, my aim has been to try and fill a gap by providing up to date guide for ordinary seamen, cadet, non offshore mariner to understand critical points and risk exposes of various step taken. Throughollt my experience onboard with nu merous Master of different national colleagues, have makes me aware the important of simpl e drawing to explain all before one assigned to do their work.
Many people have made this book poss ible. My thank to Capt. Roy Mundus Benhur, Capt Wijayanto, Jendry Gandaria, Ricky lngkiriwang who have encourage me to write thi s book and have provided great support whi le maintaining patience with effort to com plete this work in a timely manner. I would like to thank to numerous associates and assistants in volved in the development of the text. I rece ived a great deal of in tellectual and colleg ial support from my ex-ship colleague at Gulf Marine, Osa Marine OIL , PRM, Emas Offshore, Thome offshore, DESS who helped to make thi s book simple to read and understand for non offshore mariner. Most importantly, will like thank my famil ies for their continued support and encouragement, without which this book wou ld no t have been attempted, much less finished. Also the following companies for their help with advise and photograph. Capt.Krets Mamondole Master Mariner, MN I, OPO
TABLE OF CONTENTS
PREFACE TABLE OF CO NTENTS .
"
CHAPTER \. INTRODUCTION. CHAPTER I\. EQUIPMENT LA YOUT AND FUNCTION A. Types of anchor handling vesse ls 8. Standard deck layout C. Equipment involved in anchor handling O. Control station layout. E. Wire rope, shackles, anchors, & gear
3 3 7 8 17 21
CHAPTER 111. RIGGING FOR ANCHOR HANDLING A. Introduction B. Layout of the vesse ls deck equipment and the associated machinery. C. Equipment preparation for anchor handling D. In ventory of anchor handling equipment E. Anchor chasing diagram I fishing diagram F. Pulling power of the Winches
50 50 51 52 53 55 58
CHAPTER IV . SUIT CASE BUOY A. Introduction B. Deck layout and equipment related to anchor handling C. Picking up buoy and pennant D. Release pennant from anchor hand ling hook E. Receive anchor and buoy from the barge
59 59 60 61 63 66
CHAPTER V. PENfNANT , BUOYED SYSTEM A. Running anchor B. Retrieving anchor C. To pick up the buoy using the buoy catcher lasso
69 69 73 77
CHAPTER VI. PERMANENT CHAIN CHASER A. Introduction B. Running anchor C. Retrieving anchor D. Decki ng Slevpri s anchor E. Laying the Stevpris anchor F. Racking anchor G. Picking up pee from the Rig H. Handing the pee back to the rig
81 81 83 87 92 94 96 97 99
CHAPTER VII. SUPPORT MOORING BUOY A. Introduction B. Surface Support Buoy C. Yokohama Fender D. Multiple Poinl Support Arrangement pre laid waiting barge a. Introduction
II
101 101 101 110 112 11 2
b. Deploy anchor and buoy c. Hook up the Rig to the pre laid anchor d. Retrieving anchor chain
113 11 6 119
C HA rT ER V III. PRE LAJD SYSTEM A. Introduction B. Procedure using the stopper plate system C. Pre la id permanent buoy system
122 122 124
C HA PT ER IX. PIGGY BACK ANCHOR A. Introduction B. Deploying piggy back anchor w ith a surface buoy C. Deploying piggy back without a pennanent buoy D. Retrieving piggy back anchor (Tender barge)
148 148 150 153 .
C HAPTER X. FIS H ING AND GRAP PLING OPERATION A. Introduction B. Procedure to use a J-Hook C. Procedure for using the Chasing block D. Grappling sleeping chain E. Grappling sleeping pennant
161 161 162 166
C HAPT ER X I. HAN DLING CHAIN A. Introduction B. Preparatio n for handling c hain C . Putting the chain to the chain locker D. To lead the chain from the rig to the chain locker
184 184 187
C HAPTER XII. USEFU L TABLE, FORMULA AND DATA . A. Mooring line calculation- Formula abbreviat ion B. Mooring line catenary C. Mooring line calculation D. Ca lculated Example
196 196 197 198 199
C HAPTER XIII. SAFETY rROCEDURES A. Introduction B. Preparation for a Rig Move C. Personal Protective Equipment D. Tool box meeting E. Job hazard anal ysis F. Communi cat io ns G. Lighting H. Shark jaw/ Karm mechanical stoppers J. Buoy and Anc hor J. Rest 1·lours K. Stop work policy L. Log book M. C hec k li st N. Hand signals
200 200 200 200 200 201 201 20 1 201 201 201 201 202 203 204 205
O. Bibliography II I
133
157
172
175
187
190
CHAPTER - 1 INTRODUCTION
Anchor handl ing has long been a vocation that has called for a lot of interest and has been a satisfying experience for those who have done it through experience taking into consideration not just one aspect of the operation but worked on skills to develop all round knowledge of its pitfalls and ri sks that can be minimized and or eliminated. In being able to del iver the results in a effective and a effi cient and safe manner it is necessary to know what [he drawbacks that could be present and need to be addressed or ove rcome. These could be factors that arc within the ship or externally present. Internall y: Master's capability and skills, the crews experience and their abil iti es in relation to the operation, the ship maneuvering characteristics, winching capabili ties, and availability of equipment on board. Externally: Geographical conditions, the weather condi ti ons at the time of operat io ns. Human factor at and surrounding th e workplace: Client, Agent other party and or from the company itse lf. The equ ipment used by the client such as survey equipment etc. Anchor handling can be done with sati sfy ing results if all of the above is taken into account and prepared for at the planning stage of the operation and all concerned personnel informed, equipped and prepared accordingly. Good co-ordination between the Master and the crew on deck and the Master with the Rig mover is a must for the success ful completion of the operation. It is nOI infrequent to have a misunderstanding between the communi cating parties which leads to a development of a situation nOi conducive to the operation . This ean be avoi ded by holding a tool box meeting which involves the Master, the ship 's crew and the Rig mover to discuss the procedures, identify possible hazards and minimize or elim inate them, It follows that communication remains a very very important part in the operation. Communication should at all times be to the point, clearly spoken and acknowledged as having understood by repeating the o rder. This is 2 way communication and it should be carried out at all times. Thi s avoids unsafe situations from arising out of miscommunicat ion and keeps the crew safe. Crew on their part should not do something that they have not clearly understood . Confirm and re confirm if need be with the Captain, but DON 'T guess what the message is, understand it. These days the crews on board the anchor handling vessels are from different countries and backgrounds. In such situations the role of the Master is all the more challenging as he has to enhance the positi ves of each crew and suppress their negatives if any. The best way for the Master to achieve this is to lead by exampl e which will automatically establi sh a safety culture on board and turns the ship into a
disciplined high perfonnance unit where all on board enjoy the benefits of a well run unit Having said all of the above. the technical skills and the personal experiences of each of the crew bring to the ship a very big advantage, but if the crew be inexperienced the anchor handling operations will indeed be a very difficult proposition to the vess~ l and the rig. Equipment onboard is also a very important feature of the operation. But it is not enough to just have the equipment onboard. It needs to be kept in good working order. The Master and Chief Officer shall ensure lhat the maintenance procedures and the maintenance schedules are adhered to. It will be as per the companies planned maintenance which enables equipment inventory, maintenance history and inspection reports and related infonnation which will be kept updated by the Chief Officer. Equipment certification is also equally important. Delays caused due to equipment failure due to lack. of maintenance or inspection arc unacceptable and reflects very poorly on the vessels perfonnance capabilities. All crew at all levels must usc personal protective equipment and are equally responsible for their own safety and related clothing and equi pment. We all have been using these for a long time but they do need to be stressed on now and then. All crew shou ld have been issued with most of this: Coverall , Safety shoes, helmets, leather type hand glove, goggles, Bosun 's knife, work vest.
To re-emphasize the safety aspect, ALL personnel involved in the operation should be made aware of the fact that each and anyone of them cou ld STOP the operation if they see, or fe el that there is a situation that could be potentially hazardous to the operation. This is called the STOP WORK POLlCY and thi s is a recognized policy internationaliy by oil companies. When such a STOP JOB call is given. operation shall not be resumed till the situation which has arisen be resolved effectively or the hazard reduced to the most minimal.
2
C HAPTER 1\ EQUIPMENT LAYOUT AND FUNCTION
A. For the case of understanding the actual operation of Anchor handling it is necessary to be familiar with the equipment: Shown in the follow ing photographs are some ships which are used in Anchor Handling operations.
SEA JAG UAR 15000B HP
LEWEK SWAN 13000 BHP 3
PACIFIC SILVER 16000 BHP
SEA CHEETAH 15000 BHP 4
,. .. :1 ~~I
••• "
I
.
I1nll
PAC IFI C CO PPER 5500 BHP
• ••
,"IG.::'.
A NEW DESIGN OF THE STERN ROLLER . 5
SEM I-SUBM ERS IB LE RJG IN DEBALLASTED CONDITION
SEMI-SUBMERSIBLE RIG UNDER TOW 6
B. Standard deck layout for chain handling, shown also is a anchor ready to deploy. This particular vessel has 2 sets of towing pins and 2 Karm forks.
Winch compartment shown from astern, the towing pins and thc Kann fo rk are down, the tow li ne stop post on vicw on the Port and Stbd crash rai ls.
7
C. Equipment im'ol ved in Anchor handling. Spooling Drum or pennant storage reel. Thi s reel pennant's, work wires or other wires .
IS
used as a storage reel for
Pennant Storage Ree l The white arrow shows the tow line stop post. It is to stop the tow wire from going forward of this point.
Tow Line Stop Post 8
Tugger winches are small winches whi ch can be used to haul objects on the vessels decks, to transfer or even can be used to lash deck cargoes at times.
.~
;.
..
. • .•.
~.~, ' ''.' ~ ~ ~
Tugger Winch Capstan can serve the same purpose as the tuggers but one advantage is that they can be used for mooring/unmooring as well.
Capstan 9
Roller lead sheave is often used to change the angle at which the wire leads or to enab le the capstan or the tugger to pull at d.i fferent angles.
Roller Lead Sbieve Gog pad eye is used for the gog wire which keeps the towing wire in place.
Gog Pad Eye 10
Spooling wi re guide is to enab le the drum to be spoo led properly so that there are no wires criss crossing.
r Spooling Wire Guide Pelican hook stopper point, as the name suggests is used for sec uring the pelican hook assembly, or chain stoppers as the case maybe.
Pelican 1·look Stopper Point II
Layo ut anchor handling vessel
~
\
I
Towing drum
I
I Spooling drum I
kt \=\~
Anchor Handling drum
f::I Tugger w,inch
Towing line stop
!~
Stopper Kann Fork
V
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Towing pins
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Capstan
Stem Roller
I
Shark Jaw is a Hydraulic stopper which can hold up to
Shark Jaw Shark Jaw shown holding the cha in .
•
13
350~500
t of tension
Kann Fork is also a hydrau lic stopper wh ich can hold 350 - 500 tons of tensiol1 .
Doubl e Kann Fork
Single Kann Fork 14
Stern roller is to facilitate the heaving and slacking of wires and chains over the stern end without any damage to the wires and chains and also to the ship.
Stem Roller Stem gate is a means of reducing the swe ll wash ing on the deck , and preventing the cargo from being washed over. This is also a safer working deck for the crew.
Stern Gate 15
Towing and Anchor Handling Winch
Gypsy is used to pick up the chain from the deck and put in the chain locker and vi ce versa. It can al so be used to tens ion the rig chain .
Gypsy
16
D. Control Station Lay Out
Aft Contro l
An control station which has the follow ing controls at hand: I. 2. 3. 4. 5.
Poscon control panel Steering control pane l Thnlster control panel Bulk system Mon itoring system
6. Main Engine con trol panel 7. Winch control panel 8. Day light radar display 9. DP console 10. Captain chair
DP Consul 17
Fwd Control
Joy Stick Control
18
Winch Controls
Main Engines Control 19
Modem Aft Control
Modem Fwd Contro l 20
E. Wire Rope, Shackles, Anchors and Gear l. Wire The table sbown be low is for !he wires that are normally used in Anchor handling operations. TABLE OF WORKIN G WIRE fibre Core
Steel Coro
Si7-<: Appro,
1770 lensile grade
Appro"
1770 tensile grade
Nominal
Mass
8 9 10 II
12 13
14 16
Small sling. Lashing wire
18
19 20 22 24 26 28
Tugger wire. buoy catcher}1assocs Slings
12 35 Suitcase wire., Heavy slrops 'lings
K"
Kg/100m
IOM CS
""
23. 1 29.2 36.1 43.7 52.0
3.81 4.82 5.95 7.21 8.57
37.4 47.3 58.4 70.7 84. 1
25.5 32.2 39.8 48.2 57.3
4.11 5.20 6.42 7.77 9.25
40.3 5 1.0 63.0 76.2 90.7
61.0 70.8 92.4
10. 1 11.6 15 .3 19.3 21.5
98.7
67.3 78.0
10.8 12.6 16.4 20.8 23.1
106 124 161 204
23.9 28.& 34. 3 40.3 46.1
234
25.7 31.1 37 .0 43.4 50.4
252 305 363 426 494 645
117 130 144 175
208 244 283 370
J8
40
578
61.0 73.0 77.2 85 .9 95.3
56
suspended moormgs pennant
[
114 150 189
211
102 129 144
60 64 67 68
70
72 73 76 8J 89 96
103
Issued by Courtesy of Bndon Rope
21
227
336 395
159 193 229 269
458
Jl2
598 757
408 488 516
843
575
65 .7 78.7 83.3 92.8
935
673
103
817 910 1008
771
1076 1161 124$
124 148 174 187 201
1220 1452 1704 1837 1976
1433 1660 1830 1880 1990
231
262 288 297 314
2268 2570 2825 291 4 3080
28J
716
917
52
Hcav~
Minimum Breaking Force
tonnes
54
"eo", ""'"S pennants.
Minimum Breal:.ing Luad
KgJlOOm
44 4R
Worl:. wires. anchor handling pennantchasing
Mass
Lo~tI
442 468 521
36
Minimum Breaking
Minimum Breaking Force
diameter
333 341
772
2100 2170 2340 2790 3210
442 508
3267 3345 3630 4336 4983
3740 4340
595 653
6405
370
5797
2. Shackles
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Anchor Handling Hook used for anchor handling suitcase wire
Anchor Handling Hook
Note: Purpose and illustration for use of the anchor handling Hook
A.
Anchor Hook with Pennant
• B
C~
' 11 <
,,\ nehor Hook with Pennant, Tugger and Open end Hook
::::.~@
.J i"". , c
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ilG8 :s ggg;g ~
Release Pennant from Anchor Hook
:>
III .:::
35
c
iJ ~
-:::::ooe::
Lock A-Loy Link
This link is a means of connecting the tugger wire to the chain , which in tum on the other end will be connected to the Safety hook.
Look - A-Loy (Coupling Link )
Safety Hook which will connect to the end of the tugger wire.
Safety Hook 36
Tugger Wire Assembly
Pelican Hook is a manual stopper and comes in various sizes which can vary lhe holdi ng strength from 10 - 110 tons
Closed
o
Open
Pelican Hook
37
Swivel is to reduce the twist on the wire, so as to keep the wire kink free and to make the wire safer to handle whil st connecting and di sconn ecting.
Swivel Assembly
24 mm 0 wire strop 4-5 meters long
U Hinge link
l.S-2m J3/ JSmm0 open link chain Buoy Catcher (Lasso) 38
Hingelink
Kann Fork Lock Pin
Socket 39
•
Load Binder Ratchet Type
Li ver Chain Hoist
40
Wire Cutter
Co ld Chisel 41
•
•
I Kg Sledge Hammer
3 Kg Sledge Hammer
42
Pin Punch
Split Pins 43
•
Karm Fork Insert
Snatch Block
44
Clevis Safety Hook
Bull Dog Grip
45
Pipe Wrench
Axe
46
Crow Bar
Pl iers
47
Ring Spanner
Marlin Spike
48
Wooden Spike
Diagram shows how lo use the bull dog grips to fonn an eye.
, • <;
II
III
..
'J
-
",".,
r'
- - 49
CHAPTER III RIGGING FOR A C HaR HANDLI 'G A. Introduction
The rigging for anchor handling has a lot of aspects to it. The crew needs to know the various equipment which can be used and how to use it. The kind of maintenance that needs to be carried out 10 keep the equipment in top working condition. the capacities or capabilities of the equipment and above all the vessel should hold valid certi fi cates for a ll eq uipment on board. The type of equipment wi ll vary from vessel to vessel and at times to the
charterers specifications or to specific practices used in specific areas of the world. The knowledge alone of the equipment is
nOI
enough to be able to use it,
there has to be an experienced to crew to use the given effec ti vely.
Type of vessel used for Anchor Handl ing
16000 BHP Anchor handling tug at full speed
50
B. Layout of thc vcssels deck equipment and the associated machinery.
~ Tow;ng Drum
r~
Port Spooling drum ~
.'"l}-----{J
Cutting tools
I ~==;;==t- Anchor
t-
, Port Tugger _+-~
/
Stbd Spooling drum
Handling Drum
"\~~
';.j";
Stbd Tugger Tow line stop post
¥
. . / Tow line stop post
Boal hook
.,j-----,S;'bd Tugger
c apstan
Shark Jaw
i
,.
wire /capstan
•
i
-----ill--'
1 '. '
Slem Roll er _ _~----r-:!:--~
51
Swivel assembly
Towing Pin
C. Equipment Preparation for anchor handling.
Prior to commencement of operation the rollowing equipment should be looked aI.
a. Anchor handling winch, Function tested, grease, break adjusted
b. Towing Drum Function tested, Grease, Break adjusted c. Guide Pin , Hydraulic Stoppers Func tion tested, and checked for local remote operation, Hydraul ic power unit checked d. Deck Tugger winches/capstans
Function tested, brakes adjusted, wire properly spooled up end end tilting (chain tail, safety hooks) checked
e. Portable tools Checked, cleaned and assembled in a place, ready to use. f.
Deck lighting Tested, checked and defects made good
g. Communication Deck to the bridge communication tested, loud hailer system tested h. Gas cutting gear Checked and ready
i.
Rigging gear Shackles, canter link, bolt link, hinge link, chain stopper, anchor hook, snatch block, lashing chain, chain binder, place and ready and use rack, checked and greased, check soft line lashing ropes, wire sling, chain strops, ready for use. A check should also be made that the contents of the deck gear locker are stowed and placed to hand for examples, spi lt pin, lead shot, punches, hacksaws, spanner, wire cutter, etc. are all in their correct place., bulldog grips, shocked wrench set and all the other gear nonnally found in the deck store should be checked in place.
j.
Pennant reel Function tested, greased, break adjusted,
52
D. Inventory of anchor handling equipment. Given below is a list of equipment that should be onboard a Anchor handling vesseL N 0
Item
I
Work wire
2
Shackles
5
Heavy duty Swivel J- Hook Grapnel
6
Peli can Hook
7
Pennant Pelican Hinge Link Baldt type Pear link Bolt link Canter link Tugger wire
3 4
8 9 10 II 12
I (sDare)
13
Snatch Block
14
Bull dog grips
15
Wire Cutter
16
Wire rope
17
Polypropylene Rope
Size
Qty
400-1500 M x 70-76 mm 200-300 M x 70-76 mm 110100s 85 tons 55 taus 35 tons 25 tons 12 tons 8 tons 6 tons
2 3 6 6 6 6 6 6 6
150- 250 tons
2
110 tons SWL 110 tons SWL Suitable for wire up to 7 mm Suitable fo r wire up to 76 mm 70172 mm x 8 M
I I I I 3
110 tons SWL
3
76 mm 76 nUll 76mm
2 2 2
20-24 mm
4
8- 10 SWL 64mm 68mm 70mm 72mm 76 mm Manual hydrau lic type able to cut at least 35 mm wire 22mm 24mm 30mm 35mm 15mm 25 mm 30mm 35mm
4 6 6 6 6 6
53
2
2 I I I I I I I I
Remarks
Sledge Hammers with
5 kg 3 kg I kg 0.5 k. I kg
2
20 21 22 23 24
handle Ball Pein Hammer with handle Axes Crow bars Cold chisel Pin punches Pliers
3 3 3 2
Long handle
25
Pipe wrench
12 inches 24 inches 36 inches
26
Marlin spike
Heavy duty
2 6 6 5 2 2 2 2 2 2 2
8 inches
3
12 inches Heavy duty
3 3
18 19
Heavy duty Heavy duty Heavy duty Heavy duty_
12 inches
18 inches
27 28 29 30 31 32 33 34 35 36 37 38 39 40
Hacksaws Adjustable spanners
Fi les metal Ring spanner Torches
One sel
I
Water proof
4 1 3
Grinder Air driven/electric Wooden Spike Heavy duty )-iydrauiic stopper insert set, for wire/ chain isze Nails Various size 2 inch to 6 inches Lead shot for joining link Split pins for size of shackle The oxyl acetylene cutting gear Wire sling I SWL 3,5,8 with 3 meters I Chain stoppers I Heavy duty I
equipment continued ..
54
6 6
List of
I I
Note : Shackles- Shackl es should be greased and color coded. The vessel should also ensure that it has the certificates for the wires, chains and all anci ll ary equipment.
E. Anchor chasing diagram! fishing diagram. It is important to know the length of the work w ire to be paid, the distance of the vessel from the bargelrig and the amount of pennant to be paid out whilst picking up the anchor. These days the electronic survey equipment used on board the rigs renders these calculations unnecessary.
Having said that we still need (0 know the theory of the calculations so as to be able to employ them if need be: Example: Anchor chain out ----...-. fairlead to anchor
3800 feet
Water depth
350 feet
Pennant length to be used at roller
700 feet
Distance radar scanner [Q stem roller
170 feet
55
I. Work out horizontal distance - stem roller to sea bed
~7002 _ 3502
606 feet
170 feet +
2. Stem roller radar scanner
=
776 feet
3800 feet +
3. Anchor to fairlead
4. Radar distance
= 4576 feet
5. 4576/6080
=
6. Set variable range marker on O.7S
56
0.75 miles
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57
F. Pulling powe r of the winches The abi lity of the winches pulling power is calculated at the first wrap, and at full drum. The more the number of layers on the drum, less is the pulling power of the winch.
Calculated example: Data needed for the calculation: I. II. Ill .
Diameter winch inner barrel Maximum pull of the winch on the first layer Diameter wire of the wire being spoo lcd up. Refer diagram below .
iv. Number of wraps ( layers) on the drum.
•
___ l ____
R
_______ ~ _____ J
Winch max pull Wi re size Diam. Inner barrel Number of wraps
Remaining pull
250 Ions 70 mm 150em 5
Max .pull x r R
250 x 75 110
170 tons
58
R= D+ r R = 5 x 70 + 75 em R ~ 110
CHAPTER IV SUITCASE BUOY
A. Introduction The suitcase buoy consists of a hollow middle through its length so as to enable the pennant wire to be passed through the buoy. Such buoys are nonnally used on pipe lay or cable lay and small barges in shallow waters. For a typical pipe lay barge, it could use 8 anchors or 10. Out of these 6 are deployed in the bow and 4 on the stem area. Please refer diagram below. Port Bow Anchor
9
Stbd Bow Anchor
10
2 3
8
7
Breast Anchor
4
B A R
G
Breast Anchor
E
~----
6 Stem Anchor
I I I I I I
[ STINGER
5
Pipe being laid out
59
B. Deck layout and equipment related to anchor handling.
~ Towing Drum
Port Spoo ling drum
~: .... >, I,
',
'.' -- - . . "
Cutting tools
H .'.
drum
.....
/
Spooling
"
-, .
~c::c::;;:c:::t~
,.... ,. '
~
Port Tugger _+-~ ~"JI,:
Anchor Hand l ing Drum Stbd Tugger
T ow Iinc stop post
. / Tow line stop ~ post
Boat hook Stbd Tugger wire Capstan"
I
l Shark Jaw
----It--~
/
capstan
,-1:'-:,'
Stem Roller _ _~-:---+-::!:-_..J
60
Towing Pin
C. Picking up buoy and pennant
I. Anchor handling tug should come close to the buoy, the deck crew shou ld be ready to pick up strop wire, also called Lazy Wire. To pick up strop wire we have to use boat hook. See diagram no. I
I I Gambar No.1
I
Diagram No. I
2. Lazy wire connected
10
tugger wire, heave up to the deck. See diagram No.2
U-J ,-------------' -<-
I
,I
I
Diagram No.2
61
3. Anchor handling hook on work wire connected to pennant, tugger wIre di sconnected from pennant, heave up work wire. See diagram No.3
...•, -"'." ..'''.,...'''..-.....'''... -... ... ''''.-.... ........ ''
''
~ .~''
Diagram NO.3
4. heave pennant wire till the anchor reaches the bottom side of the buoy. See diagram noA
"
DiagramNoA
62
..
D. Release pennant from anchor handling hook Anchor handl ing hook can be opened in two ways: a.
b.
Using shark jaw, put the pennant in the shark jaw, disconnect work wire from Pennant and release the shark jaw. See diagram No.5 Using tugger wire with open end hook. See diagram No.6
Diagram No.5
See diagram No.7
,
,
Diagram No.6 63
c. To release pennant, hold on to the tugger. pay oul work wire ti ll pennant wire releases as the tugger wire tensions out. See diagram No.8 the following diagram to get better understanding of the process
...___........_&......."e: ... "~:..-----
Diagram No .7
_.____~I.II~<==::::,~) ~::=-C~~,--,--
Diagram No.8 64
A.
Anchor Hook with Pennant
" B
~
.... - t..
: •• ~ ~-=CPi
Anchor Hook with Pennant, Tugger and Open end Hook ~
I~"@ """""CJC"
•• < C:
Release Pennant from Anchor Hook
•
:) ,
IIII
Diagram NO .9
E
Remarks
A. Anchor Handling hook B. Anchor penllantIPennant ''lire C. Chain D. Work wire/suitcase wire
E. Tugger wire F. Open end Hook
Diagram No. J 0 65
Z
., ::::::woo=:
E. Receive anchor and buoy from the barge a. AHT backs up to the barge, the barge willlowcr the buoy along with pennant, b. The crew will pick up the strop wire and connect to the tugger. See diagram no. 11
Diagram NO.1 I c. Suitcase wi re should be connected to work wire, after which the tugger wire is disconnected. Sec diagram no.1 2
\ \ \
-Diagram NO.12
66
4. At times the anchor may have to be put to be on dec k in which case, anyone of the tugger wire needs to be connected in order to heave the buoy over the stem roll er and onto Ihe deek. See diagram no.13
,
, , ,
,, , ,
Diagram No.13 5. Once the buoy is on deck, the work wire is then heaved on to get the anchor over the stem roller and onto the ship 's deck, this is in case of a special requiremen! of the riglbarge. See diagram no. 14
, , ,
, , ,
,,
o
,,
Diagram No. 14
67
Diagram of a suitcase buoy
':"
Diagram No.15
Diagram Cross Buoy
Diagram No.16
68
CHAPTER V PENNANT , BUOYED SYSTEM
A. Running anchor 1. Anc hor handling tug should come close to pi ck pennant wire. See diagram No. 1 2. Pennant wire is connected to the work wire. See diagram No .2
Diagram No.1
Diagram No.2
69
3. Work wire is then heaved slowly and the rig pays out on its wire till the anchor reaches the stem roller. See diagram No.3 and 4
Diagram No .3
Diagram No.4 70
4. AHT moves ahead towards the target given by the surveyor if the AHT provided with survey equipment. See diagram no. 5
IS
Diagram No.5 5. As the vessel approaches the target area the work wire is then lowered to a depth that keeps the anchor about 5m off the seabed as illustrated below.
Sea bed
Diagram No.6
71
6. Once the target position is reached then the anchor is slowly lowered to the seabed, and once it is on the seabed then the vessel should be maintained in that position, so as to not drag the anchor on the bottom and keep it within the bull's eye. As the anchor is bottomed the rig should be informed.
Diagram No .7
7. When the anchor is in the holding position the rig shall inform the vessel. The vessel can then disconnect the work wire from the pennant and connect the buoy. release from the shark jaw and move the boat ahead to flush the buoy.
~J
• • • •
-"'-
-" Diagram No.8 72
8. Rrtric, ring the anchor I. The boat backs to the buoy and once close to it, a buoy catcher lasso is used to pick up thc buoy on the deck (See Chapter V C pg. 76).
Diagram No.9 2. Once the buoy is on deck the pennant wire is disconnected and the buoy is secured to avo id it from shifting around. 3. Pennannt wire is then connected to the work wire and the barge then infonned that the anchor is ready to be picked up. Do not pi ck up the anc hor till the barge gives the go ahead 10 do so.
Diagram No. 10 73
4. Once pennissJOn is given, heave the anchor to the stem roller. During this operation it is critical to maintain the vesse l's position.
00000
Diagram No. 11
5. After the anchor is on the stem roller, the barge is informed after whicb they can start to heave in the anchor wire.
Diagram No.12
74
6. When the barge starts heaving up the anchor, the boat has to keep the wire under tension and keep the vessel on the Run line given to it by the surveyor.
7. Diagram no 13 illustrates the boat close to the barge with the anchor still hanging on the stem roller.
Diagram No.13 8. The work wire is paid out slowly as the barge heaves on to the anchor to gel it onto the anchor rack. See diagram no. 14 9. Diagram no. 15 shows the anchor on the anchor rack.
/
../
;[- - - - - - - - -
/'
'\ I
= -I
~~ J
"",-'~
00000
,J Diagram No.14 75
.(
·
10. After the anchor is on the rack the work wire is further slacked to get the pennant socket up to the shark jaw. II. Disconnect pennant from the work wire.
"
"
"
0
"
Diagram No .IS 12. Disconnect the work wire from the pennant and hook up the pennant to the barge crane. See diagram no. 16
(
-~ V-
-I
-"
~J
)
..
~
Diagram No.16
76
0
0
0
0
C. To pick up the buo)' using the buoy catcher lasso. Diagram of a Buoy Catcher Lasso
24 mm 0 wire strop 4 ~5
meters lo ng
Hinge link Hinge link
1.5-2 m 13/ 15 mm 0 open link chain Diagram No.17 I. Both ends of the lasso are connected to the tugger wire and arranged on the stem as shown in diagram no . 18.
--
Diagram No.IS 77
2. In order to lasso the cross on the buoy 2 people are needed to swing the lasso over the cross.
Diagram No. 19
2. To make the operation safer, the lasso could be done as shown in the diagram, which is to go over the buoy and under the body of the buoy.
Diagram No.20
78
3. The tugger is then used to get the buoy over the stem roller and onto the deck, at limes the usc of a single tugger may not be enough to gCI the operat ion done. in thai case both the tuggers can be connected simu haneously and hca\ cd on together
Diagram No.21
4. Buoy is heaved over the stem roller and the socket, which is behind the buoy is brought past the shark jaw.
Diagram No.22
79
5. Socket goes into the shark jaw as depicted in the diagram below.
\
o
Diagram No.23
6. Buoy is then disconnected and the work wire is connected. The anchor is now ready to be pi cked up.
Diagram No.24
80
CHAPTER VI PERMANENT CHA IN CHASER A. Introduction
ppe is a system that uses a heavy duty stee l ring whi ch is connected to the 76mm wire with a minimum 30mtrs length Photo shows a Anchor handling vessel working with a semi submers ible rig which uses the pee system.
The white arrow shows the ring on the chaser pennant. 81
Deck crew connects the
AHT ruooing
pee with the work wire.
pee in heavy weather. 82
B. Running An chor 1. Below in diagram 1, the rig is ready to band over the pee to the AHT which will, after receiving it connect it to tbe tugger, the tugger wi ll then heave the pee into the shark jaw. 2.
pee is then connected to the work wire.
Di agram No. 1 3. The AHT moves ahead and the work wire is heaved up at the same time, so as to keep the vessel from getting too close to the rig. As the work wire is heaved on by the vessel the rig pays out enough to maintain the tension on the system. The ring chaser is kept on the anchor See Diagram No .2
--"",,
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~
l.
j
-! ~
"-
~ ~ ......... ... "/fff'
-
0
-1,1
Diagram No.2
83
~J 0
•
0
• f
4. Once the anchor is hung on the stern roller, the vessel then proceeds to the target as given by the surveyor, the vessel is maintained on the Run line.
5. As the vessel approaches the target, IOOmtrs off from the target, the rig is infonned and they will put the brakes on, the boat still keeps moving ahead to stretch out the chain.
" " ............
..........................
"
"
..
./~
Diagram No.3
6. After the vessel reaches the target, the anchor is lowered onto the bull's eye, at which time the vessel has to maintain the position to enable the anchor to be in the bull ' s eye.
..... .... '" ... ................... ... . ...... .
Diagram No.4
84
7. Rig shall infonn the vessel that the anchor is holding in position, then the vessel can run back to the rig with the chaser to be handed over to the rig. There are 2 steps to this procedure
pee is pa id out to the required length so as to make an angle of SO degrees with the stem roller and anchor position. See Diagram No.6 b. Vessel then backs up to the rig. Sec Diagram No.7 a.
~~
J
• • • • • I
...
.........
.... ..
.. ...... .. ......... ...
....... ···· 7
....
'-
/
~
"'"
:/
Diagram No.S
.....
.. ....
. .....
Diagram No.6 85
o
.
~.' .... .............
... ..... ...... ~."
- -. _
_
_ __
_ __
-
._..... ••••-CC..•""' •••• _ _ _ _ _ _ ........ ........ ~
............
~
Diagram No.7
8. Once the vessel is backed up enough, the
pee is then
passed back on to the
rig. Sec Diagram No.8
,--~
~~ "------t-----------I If':, ~;,>1 '"
~I 000
.... ..•...~ ..................
..•.......•• .... .
Diagram No .8
86
...... .........
......
0
"
C. Retrieving Anchor a. Vessel backs to the rig. See Diagram No.9 --~
o
:9;'7 ~.
..-.
.....
J .>--......
......
.. ......................... .
..-........
.. ........
..-........... ..
Diagram No.9
b. Rig passes the PCC , the vessel then moves ahead, and pays out a length of 1.5 times the water depth on the work wire c.
Vessel then moves ahead to the anchor position at a speed of no more than 5 kts.
t. '-----:S;. - .. .... _-••• -•• -•• ,.;;f
'-'"
..... ---.
.. .........
..-.......... .. ...... .. .......
Diagram No.1 0
87
".
.. ..- ....
....... ~
d. On closing on to the target the speed is further reduced and the pee is slipped on to the anchor, as the ring slips on the anchor the vessel may drop speed. Once the ring is slipped in the vessel has to increase pitch to move ahead and get the anchor of the bottom. See Diagram no. I I
"
0
0
0
0
......• ...... .............
................ ...................
Diagram No.11
e. When the anchor is off the bottom the RPM is again reduced and the work wire is the heaved on. See Diagram no 12, 13 and 14
~ ..
........... ......................
.....
Diagram No. 12 88
0
......
.. "
Diagram No. 13
o
,---",-
.....
".
.....
.......
Diagram No. 14 f.
Once the anchor is on the stem roller the rig wi ll heave on the chain and the vessel moves ahead, so as to keep the anchor on the ring chaser which is now at the stem roller.
89
g. Moving the vessel close to the rig. I.
pee is paid out on as the rig heaves in, but the vessel keeps moving ahead to mainta in the tension ti ll the anchor is on the rack . See Diagram No. 15 and 16
Diagram No. 15
2.
pee is disconnect and returned back to the rig. See Diagram No. 16,
Diagram No .1 6
90
17
3.
pee shown back to the rig. See Diagram No. 17
Diagram No.1? The vessel could be requested by the installation to deck the anchor so as to avoid any damages to the sub sea structures or constmclion for ego Well head, ri sers, pipelines or cables etc. in the area in which the anchor is going to be nm The anchor should be decked with the due care that when it is being brought up the flukes of the anchor should not damage the stem of the vessel. In order 10 achieve this the flukes of the anchor should be outboard of the stem and not pointing inwards See Diagram no 18
i'···· ·".
1- ··· · · ·. .
iJ."=1 " ~I Diagram No.IS 91
Wrong
Correct
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..... .... .. .
. ... . . -
$
0
~L. 0
'"" 1 0
0
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-'
.... ". . '
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....... ....... .................. ..............
.......
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0
0
0
0
I Correct I
Diagram No.19
D. Decking Stevpris Anchor a.
Invariably when heaving the anchor on the deck the fluke s wil! 110nnaily point
to the propeller which is not a safe situation. See diagram No .20
Diagram No.20
92
b. To so lve the situation, the anchor is lowered and the propeller are churned for a few seconds to rotate the anchor See diagram No.21
.....
:; .
J
Tum
Diagram No 21 c. Once the fluke s are in the outward direction then the anchor can be brought over the stem roller. See diagram No.22 and No.23
~
V 1\\
.. . ..
Diagram No 22 93
Diagram No. 23
E. Laying the Slcvpris Anchor a.
Decking anchor is specially requ ested by the rig operator or some special job to replace the anchor or the rig has just come to the new location after a dry dock, or to avoid damage to sub sea installation etc. See diagram nO.24
b. Special attention is to be given to the way the anchor is decked. It is always best that the anchor is decked with the flukes pointing skywards and NOT downwards to the deck.
Diagram No.24
94
Stcvshark anchor paying out over the stem ro ller
~~ ...
...
..
/r~
..
Diagram 0.25 c. To put Ihe anchor over the stem roller, the rig has to give vessel the permission to do so. Once vessel has the permission, the vessel moves ahead slowly to tension thc chain. while thc work wire is slowly paid out to allow thc anchor to move to the stem roller. See diagram no. 26
95
,,
•..... ......
.
'
Diagram No.26 Before the anchor is deployed on the seabed, it is on the stern roller at which time it has to be made certain that the triangular plate of the anchor is sitting firmly on the roller. This ensures that the anchor remains stable in that position.
F. Racking Anchor a. As the rig heaves the chain the vessel pays out on the pee with the tension being maintained at all times, the ring chaser has to be on the anchor h. The flukes of the anchor should be pointing towards the rig as shown in the diagram 00.27 c. In the diagram no. 28 the illustration is of an ring chaser not on the anchor which allows the anchor to hang and it is not a desirable situation since il makes it more difficult and operation to rack.
"'::--
~
,.,.
_--------=?'
-
~-
\
5
L -::. - ---
:::"'''
Keep Teosion
Diagram No.2?
96
-~
•
-~A _ c-/'" tb'
[
-
f--
" 'i
~ l
~----
--------f"
JJ
Wrong
Diagram No.28
G. Picking up Ihe
pee from
the rig.
a. Rig shall lower the pee with the means of a pig tail wire (A), of which there is another one which is to be connected to Ihe ships tugger (B) once on the deck.
B
Diagram No.29
97
b. Pig tail wire (8) after being connected to the tugger, the socket is heaved on to get it into the shark jaw. See diagram no 30 & 31.
Diagram No.30
Diagram NO .3!
98
H. Handing the PCC back to the rig.
a.
pee is disconnected from the work wire and once the crane is ready the pig tail wire is booked onto it. It is desirabl e that the wire is behind the socket wh ich makes it easier for the rig to han g it. See Diagram No.32
Diagram No .3 2 b. After the pig tail wire is hooked on to the crane, the towing pin is opened and the shark jaw released to let the wire be picked up by the crane. See Diagram No. 33 dan 34
Diagram No. 33
99
c. Pennant wire is back with the rig.
Diagram No.34
Semi-submersible rig in all readiness to move. Pennanent Chain Chaser System
100
CHAPTER VU SUPPORT MOORING OPERATION A. Introduction
At times when running anchors, there is a necessity to keep the anchor wire clear of the sub sea installation to avoid damage to the same and keep the anchor wires from fouling in it. To this end the support mooring system is used. The above objectives can be achieved in the systems listed hereafter. There are 3
systems viz \) Surface support buoy 2) Yokohama, fender 3) Multiple point support mooring
B. Surface Support Buoy a. Surface Support Buoy is used to keep the anchor wire! chain clear of the
underwater construction, cablcs or pipelines, wellheads and for other similar structu res .
____- - --1
0 ,1" P\oL.IF"b fl",
OBSTRUCT !ON
I
\
---~
Diagram No .1
Note: A - Anchor B BargefRig C - Buoy
Diagram Delta Plate
101
b. Procedure I. Buoy and Anchor along with the delta plate to be ready on the deck . 2. Pennant should be coiled on to the anchor handling drum 3. Extension of the anchor wire should be coiled around the anchor handling drum after the pennant has been taken on. 4. Surface pennant shal l be connected to the buoy and laid out on the deck, but not connected to the delta plate yet. ( Shallow water) Vessel backs up to the rig and picks up the anchor wire . Crane lowers the anchor wire, the ship's crew shall be ready to connect the tugger and bring it into the shark jaw. See Diagram no.1 & 2 Once the anchor wire is in the shark jaw the boat moves ahead to keep a safe distance from the rig. The wire is then connected to the delta plate, the extension wire is also connected to the delta plate at this time.
Diagram No.1
102
Anchor wire heaved by the tugger wire and brought into the shark jaw.
Diagram No.2 Once the anchor wire is in the shark jaw the boat moves ahead to keep a safe distance from the rig. The wire is then connected to the delta plate, the extension wire from the sh ip 's anchor handling drum is also connected to the delta plate at this time. The laid out surface support pennant is connected to the third end of the plate. Refer diagram no. 3 for a better understanding
Diagram No.3 103
To deploy the surface suppon buoy, the vessel moves ahead slowly and the extension wire is paid out till the surface support buoy is over the stem roller and into the water. See Diagram No .4 & 5
Diagram No.4
Diagram No .5 104
Extens ion anchor wire is then paid out ti ll the soc ket is in the shark jaw and then disconnected and connected to the anchor. The pennant wire is connected to the anchor. See Diagram no.6
~.-...... ~ -":'~;;::>-----: "'----.... ~
~
Diagram No.6 To deploy the anchor on the stem roller, See C hapter V Diagram 110.5, 6, 7 and 8 pg 70-71 c. Anchor line is a chain.
/ - - - 1 D.~.f'!.w'F ..hPI...
ii : :
1 :
\
OBSTRUCTIon
"-----
Diagram No .7 105
./' ---------
\
If instead of anchor wire, a chain is used the procedure is very similar to that of the wire. The crane will lower the anchor chain, the ship 's crew will be ready to connect it to the tugger and heave till it is into the shark jaw. Once the chain is in the shark jaw the boat will move ahead to keep clear from the rig. In diagram no 7 it shows two wires connected to the delta plate, one is connected to the chain from the rig and one to the anchor. Two wires are to be on the anchor handling drum after the pennant. Anchor chain is stowed in the chain locker, anchor and the surface support buoy as well as the surface support pennant are on the vessel's deck.
Anchor wire on the anchor handling drum is connected to the chain on the shark jaw. See Diagram no.8
=
D Diagram No.8
106
Aftcr connecting, ensure that there is tension on the wire then shark jaw is released, and the anchor wire is paid out till the socket is on the shark jaw. See Diagram no.9
Anchor wire 2
\
Anciwire 1
=
D Diagram No .9 Anchor wire no. I is disconnected and then the delta plate is connected to the anchor wire no 1 and 2 as shown in the diagram no.1 O. Please note that the surface pennant has already been connected to the delta plate.
Diagram No. 10 107
After the above procedure the anchor wire no. I is paid out till the socket is in the shark jaw as shown in the diagram no. II
nn
\
Diagram No. 11
Pennant is now disconnected from the anchor wire no. I and then anchor chain from the chain locker is connected to the anchor wire no. l . Refer diagram no. 12
Diagram No.12 108
In order to connect the chain, it is easier if there is a length of abou t 5 mtrs left on the deck forward of the shark jaw. See diagram no.13
- _-- -"""m
Diagram No .1 3 The anchor after being con nected to the chain is the connected to the pennant on the anchor handling drum as shown in the diagram no. 14. The anchor is now ready to be deployed.
/?~ - ~~~G;;: -_ ~
/~_ "._._
_ __
_8
Diagram No.14
Pig Tail Chain: The pig tail chain is like a messenger chain , it is easier to handle and hence it is used to bring the anchor chain in to the chain locker or to bring the chain out of the chain locker. It is normally 1.5 times the length of the vessels work deck length. 109
C. Yokohama
a.
Yokohama fenders can also be used as a support system to keep the anchor wire clear from the underwater cables! pipes, wellheads etc. The Yokohama fendcrs are nonnally installed by the barge, but it can al so be done by the vessel. This systcm does not use a pennant, but instead uses a wire strop and clamps to achieve the objective of connecting the anchor wire and kceping it dear of the sub sea structure. See diagram No.IS Usually this kind of support system is predominantly used for pipe/ cable lay barges.
YOKAHAMA SUPORT
J--J\ _ I
CLAMP
I
Diagram No.IS b. The barge is responsible to calculate the distance from the obstructions and the length of wire that is to be paid out, and the position of the anchor in relation to the barge as well as the obstructions. Barge will instal l the Yokohama as per their calculations. Anchor handling tug will run the anchor and the barge will payout till the Yokohama fender is on top of the obstructions.
In the process of running the anchor, it is made certain that therc is sufficient tcnsion on the system so as to keep the wire clear of the obstruction at all times. It would follow that the barge cannot payout too fast, or the boat cannot move too slow. This is called a Static Run.
110
Yokohama Fender shown hanging on the anchor wire.
Diagram No.16
Yokohama Fender is shown to keep the anchor wire clear.
Yoko hama
Run UndO¥ tension
Otlstruction
Diagram No .17 III
Yokohama Fender over the obstructi on
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ri
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--
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Diagram No.IS D. Multiple Point Support Mooring ~ Arrangement pre laid awaiting Ba rge
a. Introduction It is a system wh ich uses two or more surface support buoys wh ich are pre laid, prior to the arri val of the barge.
This system like the other surface support system is to keep the wire from damaging sub sea install ation but in thi s case there may be 2 or more sub sea areas that need to be passed over to lay the anchor.
Amho< Clwn 10
o
Diagram No .1 9 112
An
To carry out this system, additional equipment is needed as shown in the diagram no. 20. A temporary buoy and a temporary anchor
T'<4-<>"'Y Booy
WRS - Wire Rope Section
Diagram No .20 b. Deploy anchor and buoy 1. Anchor on the deck is connected with the anchor chain from the chain locker and then put on the stem roller. The vessel proceeds to the target. 2. On reachi ng the target the anchor is deployed on the sea bed, the vessel then moves in the direct ion of the rig ( not in position yel) . The chain is put on the shark jaw and disconnected from the pig tail chain. See Diagram no 21
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On S econd O bstructi o n
n F,rst
Ob",ru~t1o"
Diagram No.2 1 113
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3. Wire rope section 1 is connected to the chain and paid out till the socket is in the shark jaw and disconnected from the wire rope section no 2. 4. Delta plate is now connected to the WRS I and WRS 2, the support pennant is al so connected to the delta plate. 5. The wire rope section 2 is paid out till the buoy is deployed and the socket is in the shark jaw. See Diagram no 22
F,rst Support Buoy
o
----~
Se cond Obst ruc!JolI
Diagram No.22 6. Now the socket of the Wire rope section 2 in the shark jaw is now AGAIN connected to a delta plate, which will also be connected to the wire rope section 3 and the support pennant for the Second buoy. 7. Wire rope section 3 is paid out till the buoy is deployed and the socket of the wire is in the shark jaw. See Diagram no.23
Second Sup!'o< ' Buoy
Firn Suppo<' Booy
Ancb..-C'hoLO. to Ambo,
/ S..,«>d ObmuctlQn
Diagram No .23 11 4
8. Pennant wire connected to the wire rope section 3 is disconnected. 9. Ground chain is now connected to the wires no. 3, on the other end it is already connected to the anchor 10. Pennant wire is connected to the temporary anchor and is then paid out till the temporary anchor is deployed on the sea bed, the pennant socket is then out in the shark jaw and the buoy is connected to the pennant and deployed. See Diagram no.24
"'"
...
' ",,": ,:b,.. 10 An
Diagram No.24 Note: At all time.\' throughout the operation of deploying the hllOYl' the lystem mllst be kept under adeqllate tension so as to keep the wires clear of th e obstru ction Every end of the delta plate has a pig tail chain which makes it easier to COllllect and disconnect. The length of the pig tail elra;n is 1.5-2 mtrs X 3inch
"
11 5
c. Hooking up the rig to the pre laid anchor. 1. Vessel backs up to the rig, receives the anchor wire and puts into the shark jaw, after which it moves to the temporary buoy keeping adequate tens ion in the system. See Diagram no.25 and 26
---_.__.-
"
Diagram No.25
........"l;!ji!!!!!!
I .... ·.. ·.. ·....· ·......'
Diagram No .26 11 6
a
a
"
2. Vessel picks up the temporary buoy and puts it on the deck, the pennant soc ket is put in the shark jaw. The buoy is then disconnected. The work wire is connected to the pennant wire. See Diagram No.2?
.......
Diagram No.27 3. Pennant wire is heaved up ti ll the anchor is on deck, keep heaving till the socket of the wire rope section 3 is in the shark jaw.
Diagram No.28 117
4. Disconnect the ground chain from the WRS no. 3, disconnect the pennant wire from the anchor. Anchor and buoy are now lashed to one side 5. Anchor chain is then connected to the WRS 3. 6. Both the shark jaws are then opened and the wire section 3 and the chain will be deployed. See diagram no. 29
S, c,,"d ob, 1l"uc l!on
Diagram No.29 Photo shows the Delta plate with pig tail chain being used to conn ect the anchor wire and the pennant.
118
d. Retrieving the Anchor chain to the rig I. Vessel backs up to the second support buoy. See Diagram nO.30
..... .
Anchor Chsirl 10
...... ......... / .......
ltis
.... .-.--~ Fin;1 ob$trucbon
Diagram No.30 2.
Second support buoy is picked up and put on deck, the buoy disconnected and pennant wire is then connected to the work wire and heaved up. See Diagram no.31
......
:~"h"L"h.mtorug ........ /
~
7,,,
MSJ
..............
"" s",port Boo,
~
"'-.
_--'
,WRS2
'" ••. ••'" .......,..-""
......
n
--
n
Second obstruction
Diagram No.31 119
/'
____
,WRS I ""
Anchor Chain to Anchor
n '-''-( First obstruction
3. Work wire is heaved up till the delta plate connecting the WRS 3 and WRS2 comes on the deck, it is tben put in the shark jaw. 4. Wire rope section 3 is then disconnected from the delta plate and then wire section no 2 is paid out till the socket of the pennant is in the shark jaw.
~
F;,,' S",po" Boo,
? '\_------z ~~s, A yz
- '"
.... _____ /
Anchor Chain to rug
'\.WRS 1
........
nil Second obsbuction
Anchor Chain to Anchor
, ,~
First obs\nlctiou
Diagram No.32 5. Th e buoy is the reconnected to the pennant and re deployed in the water. See diagram no. 33
Second Support Buoy
First
S~port
Buoy
WRS3
Second obstruction
Diagram No.33 120
First obstruction
6. Vessel backs up to the rig to return the anchor chain which comes with a 30mtr X 3" wire sect ion (Like a messenger). This wire is the one which will be used to hand over the chain to the rig. The WRS 3 is put on the anchor handling drum and then disconnected from the chain, the chain is then reconnected to the messenger wire. Then the WRS 3 is reconnected and the messenger is then tensioned on the drum, it is then slowly paid out till the socket of the messenger is in the shark jaw. See Diagram no.34
2nd Support Buoy
"
First Support Buoy
...............
First obstruction
Second obstruction
Diagram NO .34
7. Messenger is then handed oyer to the rig. See Diagram no.35
-t:'
.
~
'
.. ...
:
~
2nd Support Buoy
Fin! Supp ... , Buoy
..._--
.......... ~S3./ ....
\'M
On Second obstmction
Diagram No .35 12 1
LJ
Ancher Chain 10 Anchor
'-../
First ob/;Inlclioll
~
~9
CHAPTER V III PRE LAID SYSTEM A. Introduction
Pre-laid system is, as the name suggests, a system in which the anchor is laid before the rig arrives the location. In this system, there used to be a method of using a permanent buoy, as shown in the diagram below. These days a "Stopper plate" is used with a temporary buoy, which can later be done away with. This type of system is shown in the diagram no 2.
SUiface Buoy
--.-.
---__
Anchor wire
---
-------- -._--------\. D~IJI
Ground chain
'- ~-
plale
"
-'"
-----------"9
Diagram No . 1
r
At/Ire to
,
Rig
-........,...... . /
--------.
/ ' ""
S toppa- plate
AJlchorWir~
/
''-.,
~
~'''''''~~
Diagram No.2 122
I
Or oUlld chrrin
--
.... ...
---. ...... .....
",
.... " ,
-" ,
In water depths of 1000 meters and more a polyester rope is used, in part and the rest is wires on either side of the rope as shown in the Diagram no.3 . The anchor used in this kind of a lay is predominantly as Bruce Dcnnla anchor.
Anciooo- Wire 10
~~
...... ,..
Ri8
'Vir ..
/y. ~
I
S I"PI'''- 1'1., ..
2
l'---.....- LI:JD -
-~
Diagram No.3
DENNLA Mk2 12m' •c
••
,I
""'" """""
J>. . ~ • : 1NIoII_ C In,ooIIod fT ....od1 0 : • ........,
~'
8714
Bruce Dennla 123
",.""
B. Procedure using the Stopper Plate system. a.
Deploy the anchor (Stevpris Anchor)
I. Vessel has to ensure that all the equipment that is gomg to be used in the operation in at readiness. The anchor, the ground chain, temporary buoy, chasing collar to be on dec k. Pennants on the drum. 2. Vessel moves in direction of the target, put the anchor to the stem roller. On arrival at the target area, the anchor is lowered to the seabed. 3. After deploying the anchor the vessel moves in the direction of the rig' s position and pays out on the wire until the wire socket is in the shark jaw. 4. Once the wi re socket is in the shark jaw, the shark jaw is released and the boat tensions the system to check the anchor is holding.
Diagram No.4
5. Once the system is tensioned, the ship' s engines are brought power.
\0
minimum
6. Once on min power the vessel pays oul the pennant of the temporary buoy which has been connected to the anchor wire at the time of pre operations preparation. See Diagram nO .5 7. Once the pennant socket is in the shark jaw, the temporary buoy is connected, the shark jaw lowered and the buoy deployed.
124
Buoy in the water.
•
A '-r"
-----.. -._---------
b.
Hook up
~
Diagram NO.5
I. Vessel backs up to the rig, picks up the anchor w ire from the rig, moves ahead to c lear the rig.
2. Wire socket from the rig is put in the shark j aw and then connected to the work wire for the lime being. The vessel thell proceeds to the temporary buoy See Di agram 00.6
--.
Diagram No.6 125
3. Once at the buoy, tbe vessel picks it up and puts it on the deck to disconnect. Tbe pennant socket is put in the shark jaw, buoy is taken off. The work wire which is previously connected ( temporarily) to the anchor wire socket is now connec ted to the pennant and the pennant picked up , till the anchor wire comes to the shark jaw. 4. Pennant w ire is disconnected. It is now ensured that the stopper plate assembly is slipped in to the chasing co llar, and then connected to the wire from the rig, the wire to the anchor and the pennant on the drum. Refer diagram no. 7 & 8
Shark Jaw Wire Rig
I
/
Chasing collar
Pennant wire to drum
\
Wire to Anchor
\
Stopper Plate
Shark Jaw
Diagram No.7
- ---- -------=;>
Diagram NO.8
126
5. After connecting the anchor wire, rig wire and the pennant as explained above, the pennant is heaved in to tension the system, after which the shark jaw is opened. 6. Pennant is lhen lowered. This peMan! is going to act as a pennant chaser. See diagram nO.9 and 10
Diagram No .9
Diagram No.1 0 127
7. After the anchor is tensioned by the rig, the tension on the vesse l's pennant will be lost, after which the vessel backs up to the rig and returns the chaser. See diagram No.11
...
Diagram No.1 1 8. Pennant back on the rig. See Diagram no.12
Diagram No.12 128
c. Retrieving Rig Wire 1. Vessel backs to the rig, picks up the pennant chaser. See Diagram no.13
Diagram No .1 3 2. Pennant is put in the shark jaw and the work wire connected 3. Shark jaw is opened, the work wire is then paid out till it is 1.5 times the depth at wh ich the stopper plate is. See diagram no.14
Depth al the stop per plate.
Diagram No .14 129
4. As the pennant chaser comes on the stopper plate, the rig is infonned to slack on the rig wire. As the rig pays out on the rig wire, the vessel heaves in it 's work wire. See diagram no.IS and no 16
Diagram No .IS
\
.•~ .~
---~
.~
-------
Diagram No.16 130
- -
•. .. ... .... --- ~
5. Continue heaving the work wire 0 11 the vessel till the stopper plate is on the deck, mainta in adequate tension as the vessel moves in the direction of the anchor. See diagram no. 17 6. Both the sockets, one fro m the rig wire & one from the anchor wire are put See no. 18 into the shark'
Diagram No. I 7
Shark Jaw
Woi R9
/
Chasing collar
/ Pennant wire to drum
\ Wire to Anchor
\
Stopper Plate
Shark Jaw
Diagram No .1 8 13 1
7. Both these are disconnected from the stopper assembly, the pennant is also taken off from the chasing collar and connected to the anchor wire. The pennant is paid out till the socket is in the shark jaw, the work wire disconnected and connected to the temporary buoy and the buoy deployed in the water. See diagram no.19
Diagram No. 19 8. Once the buoy is in the water, the rig is infonned. The rig then heaves in the wire and the vessel backs up to the ri g maintaining the tension on the system.
Diagram No.20
9.
The wire back to the rig. See diagram no.21
- --------- '"9
Note:
Diagram No.2l
To carry out an operation of the kind above, the vessel needs to have 2 shark jaws, or if it only has one, then it needs a minimum of 2 stopper wires to be avai lable. C. Pre Laid System, (Permanent Buoy)
a. Deploying the anchor I. As in the above operation, the vessel shall ensure that the equipment assoc iated with the operations are ready and available. 2. Vessel proceeds to the target, the anchor is put on lhe stem roller, after arriving the targellocation, the anchor is deployed to [he seabed. 3. Once the anchor is deployed on the seabed, the vessel then proceeds in the directi on of the rig's intended position while paying out the anchor wire. 4. Once the socket of the anchor wire is close to the shark jaw, the vessel tensions the system by increasing the power, this will check the anchor is holding the ground. S. Once the anchor is found to be bolding the vessel's power is reduced to minimum. The anchor wire socket is the put into the shark jaw, the pennant disconnected and a delta pl ate is used to connect the anchor wire on one side, the pennant wire on the other side.
133
Diagram No.22
6. The pennant is paid out till the pennant soc ket is put Ln the sha rk jaw, the surface buoy is connected and deployed in the water. See diagram no.23
,.1.
S mt'ace Buoy
......
----
G rOlUld cilaiu
_--,...............
-------------
Diagram No .23
134
b. Hooking up. 1. Vessel back to the rig and picks up tbe rig wire. See diagram no.24
Diagram No.24
2. The rig wire socket is put in the shark jaw, the work wire is then cormected to the rig wire. The vessel then moves in the direction of the buoy. See diagram no.25
Anchor wire
Diagram No.25
135
3. Vessel moves slowly to the buoy.
-..........
........ Anchor wire
............
--'"
Diagram No.26 4. Buoy is lassoed and brought on to the deck, the buoy is the disconnected from the pennant and the work wire, which is connected to the rig wire is disconnected and then connected to the pennant. See diagram 110.27
Anchor wire
Diagram NO.27 136
5. Work wire is heaved on till socket o r the anchor wire is in the shark jaw. Sec diagram no.28 & 29
AlJchor wire
Diagram No.28
Wire to rig
Wire to anchor
Diagram No.29 137
6. Pig tail chain from the rig diagram no.30
Wife
is then connected to the delta plate. Sec
Wire to rig
~anChO' Diagram No.30 7. The pennant is paid oul till the delta plate is in the water and the soc ket of the pennant is in the shark jaw. See diagram no .31
Anchor wire
Diagram No.3 l 138
8. Buoy is then connected to the pennant and deployed in the water. See diagram no.32
Qrol.Uld chain
Diagram No .32 c. Retrieving Rig Wire 1. Vessel back to the buoy, lassoes it and the buoy is brought on to the deck .
Diagram No.33 139
2. Pennant wire is put into the shark jaw, buoy disconnectcd, work wi rc connected to the pennant and then heaved on till the delta plate is on deck and the anchor wire socket is in the shark jaw. See diagram nO.34
, ItJ
~
---------- ", •
~.~
..I.
"
""......' .
................ _ An('hor wiTt
- _._ .. __..
Diagram No.34
3. Disconnect the rig wire from the delta plate. See diagram no. 35 & 36
Anchorwir~
Diagram No.35 140
Pennant wire
\
-----Ir-~O~~-"@--"=~-~----Anchor wire
Diagram No .36
4. Pennant wire is paid out, till the socket of the pennant is in the shark jaw.
Anchor wire
Diagram No.37 141
5. Buoy is then connected to the pennant. See diagram 00.38
Diagram No .38
6. Once the buoy is deployed, the rig is informed. The rig then heaves on the rig wire, the vesse l moves slowly to the rig and maintains adequate tension on the wire. See diagram no. 39
Diagram No.39 142
7. Handing the wire back to the rig
Anchor wire
Diagram NoAO d. Retrieving Anchor I. Vessel backs to the buoy, the buoy is lassoed and brought on deck, the
pennant is then connected to the work wire and the work wire is heaved on, till the delta plate is on the deck. 2. Anchor wire socket is put in the sbarkj aw, the delta plate is then disconnected and now the pennant is connected to the anchor wire. See diagram noA2
•
Surface Buoy
~
Ground chain
------------~
-"-------
Diagram No.4 l 143
----
-----~
G
-
o
Diagram No.42
3. The anchor wire is then heaved till the angle of the wire is close to vertical , the vesse l's heading is then changed by 180 degrees to ensure that the anchor flips over and is easier it retrieve thence. Thi s shall also avoid and damage to the anchor. See diagram no.43
Change to opposite heading
Diagram No.43 144
4. Anchor wire is heaved up slowly while the vessel moves ahead slowly. See diagram no. 44
l
-"'-
.
J
,
-, Diagram No.44 3. As the wire leads slowly astern, the vessel is then slowed down . The pennant wire length should then be about 1.25 times the water depth. At thi s point the winch is stopped and brakes are on . The vessel the moves slowly ahead lill the tension builds, once the system is tensioned the boat can increase power to get the anchor clear of the bottom. See diagram 00.45 & 46 This procedure is to avoid any damage to the flukes of the anchor and al so it is easier to retrieve the anchor from the bottom.
t
~
I
I I I
/
I I I
/
I
I
-=;; Diagram No.45 145
....
1
Diagram No .46
5. Continue heaving on deck (ill the anchor is on deck. See diagram no.47
Diagram No .47 146
6. Before hanging the anchor on the stem ro ll er ensure that the flukes of the anchor are pointing outwards and away from the vesse l's stem. See diagram no.4 8
Diagram No.48 Deck crew shown connecting the chain.
\47
CHAPTER IX PIGGY BACK ANCHOR
A. Introduction Piggy back system of anchors is a system which uses 2 or more ancho rs on the same wirelchain which enhances the holding power of the system. See diagram no. I, 2, 3 and 4
1. The illustration be low depicts the use of two Stevpris anchors, the pennant of the piggy back is connected on to the pad eye of the main anchor whi ch is j ust behind the anchor. Thi s kind of a system (the one shown below) is used without a pcnnanent buoy and is hence used in FPSO ' s, SBM's and al so the pre laid system .
Diagram No.1
2. The piggy back system shown below is used with a pennanent blloy and is used typically on tender barges. ~
I'----
~
-'& ~
,
v
Diagram No.2 148
~ - --~ ~
-
3. Piggy back system that is shown below, is a system that is used on rigs, the rig pec is used as a wire to connect the piggy back anchor. Also thi s system does use a surface buoy, but in this case, the pennant of the surface buoy is connected to the pad eye on the Piggy back anchor and not on the main anchor. There are times when the rig may need more length on the wire of the piggy back anchor, in which case there is a extens ion wire that is then connected to the PCe. See diagram no.3
/) ~
"
V
'1) v
Diagram No.3 4. System shown below combines a Stevpris anchor and a Flipper delta anchor. See diagram no.4
~
() ~
J/
Diagram No.4 149
.#'~
B. Deploying the Piggy back with a surface buoy. I.
Prior to the ops, the piggy back, the main anchor and the surface buoy should be on deck. The piggy back pennant and the surface buoy pennant should be on the drum.
2. Vessel backs to the rig and picks up the anchor wire. See diagram nO.5
Diagram No.5
3. Anchor wire is the connected to the main anchor. 4. Pennant of the piggy back anchor is connected to the pad eye on the main anchor. 5. The main anchor is then put on the stem roller. 6. Vessel moves to the target given by the surveyor. 7. Once on target the anchor is deployed. See diagram no.6
150
Diagram No.6 8. Once the socket of the piggy back pennant is in the shark jaw, it is disconnected from the buoy pennant. The Piggy back anchor is the connected to the anchor wire. The pennant of the buoy is connected to the pad eye located behind the piggy back. 9.
Once. thcse connections are done, the pennant is the paid out on. See diagram no.7
Diagram NO.7 151
10. The pennant is slacked on till the piggy back is on the sea bed. See diagram no .8
, ,~~
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.'!
.. ,
I
.~'
Diagram NO .8 11 . Once the piggy back is on the seabed, the pennant is paid out till the socket of the pennant is in the shark jaw. Disconnect the pennant from the work wire. 13. Surface buoy is then connected. See diagram no.9
Diagram No.9
152
14. Buoy is thcn dep loyed to the water. . See diagram 110.10
Diagram No.1 0 C. Deploying a piggy back anchor without a permanent buoy.
This system is used on FPSO's and SSM 's . It uses a temporary buoy as shown in the diagram. Thi s is a procedure which is carried out prior to the FPSO's arri val. Diagram no. I I is dcpicting a pre lay with the anchor chain still connected to the tcmporary buoy.
I Tcmporary buoy I
/
-tJ
Pennant wire
I I
I
.---------------~
~:.:::::.:~:=.. ...t
Piggy back anchor line chain
-----..-----_._.\ / -. ~~.~~.-
I Anc hor line chain I Diagram No. 11 153
~
Diagram no.12 depicts the FPSO now hooked up to the anchors.
h !:::'::, f PSO
I
~
~
Anchor line chain
\
~~
I "'" ",' __ do"""",, I ----............... _
~.
-
~----<- _..
~
Diagram No.12 a.
Deploying the piggy back anchor
1. The vessel moves towards the target where the piggy back is to be deployed, white paying out on the chain/wire. See diagram 13
Diagram No. 13 154
2. Piggy back anchor is deployed on the sea bed. Sec diagram no.14. The anchor chain of the piggy back is then connected to the pad eye of the main anchor.
... . .
Diagram No. 14 3. The main anchor is then put on the stem roller and is then paid out on the sea bed. See Diagram nO . 15
l
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. ....
,,-J>,,
\
\,
~\ , \
'-"
'"
'-."
Diagram No. I S
155
",
....
~
4. Vessel then moves ahead and keeps paying out on the chain till the pig tail chain from the chain locker is on deck. At this time, it is put in the shark jaw. See Diagram no.16
Diagram No.16 5. Pig tail chain is di sconnected from the anchor chain , the pennant from the anchor handling drum is then connected to the anchor chain. The pennam is then paid out till the socket is in the shark jaw. 6. Temporary buoy is connected to the pennant and deployed in the water. See diagram nO . 17
Diagram NO.17 156
D. Retrieving piggy back anchor (Tender Barge) L Vessel backs to the buoy.
,, I
i Diagram No.1?
2. Buoy is picked up on deck and disconnected. Th e work wire is then connected to the pennant wire. See diagram no.I S
Diagram No.I S 157
3. Pennant wire is then heaved on till the piggy back is off the bottom. See diagram no.19
,t
~ ,'
,'
;
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Diagram No .19 4. Piggy back anchor comes over the stem roller and onto the deck. See diagram
no.20
Diagram No.20 158
5. Once the piggy back anchor is on deck, the socket of the piggy back anchor wire is put in the shark jaw and the piggy back anchor is disconnected as well as the buoy pennant 6. Pi ggy back anchor is put to the side and secured. The pennant wire
IS
connected to the piggy back anchor wire and heaved on. Sec diagram no.2t
1-------------------------------
-.I /
Diagram No.21 7. Once the main anchor is on deck , it is disconnected from the anchor wire as
well as the pelmant wire. Vessel then backs to the rig to return thc wire. Sce diagram no.22
Diagram No.22
159
8. Anchor wire is handed over to the rig. See Diagram no.23
6
Diagram No .23
160
C HA PT ER X FI S HING AN D GRA PPLING OPERA n ON A. Introduction
Fishing and grapp ling operation are essentiall y done when the normal methods of anchor handling cannot be employed. Th e fo llowing are the some of the possibilities in wh ich the above operation wi ll need to be carried out. I.
Pennant of the surface buoy parts o r is damaged .
2. pee parts. 3. Pennant wire is inadvcrtcnl ly released from the shark jaw and slips over the stem roller.
The equipment used for fi shing and grappling is of3 types, as listed below
1. J- Hook type chaser. 2. Chasing Block 3. Multi pronged Grapple (G rapnel)
,-
'0' , ' ,, ''
,
"
J-Hook
Chasing Block
Grapnel
J-hook - This is useful when the ancho r line being used is a chain/wire.
Chasin g Block - The chasing bl ock is used for the purpose of retrieving w ires only.
Crapllcl- It is used for the chains as well pennants.
161
8. Procedure to use the J-hook. I. J-hook is connected to the work wire and laid out on the stem as shown in the
diagram no. J. 2. J- hook is put on the stem roller and then paid out as required. 3. The vessel then proceeds in a direction perpendi cular to the lay of the chaser wire.
Diagram No. 1 4. The vessel lowers enough length on the work wire, so that it is below the depth of the anchor wire at that point. See Diagram no.2
~---~--Diagram No.2 162
5. Once the work wire has made contact with the anchor wire, it is heaved on. 6. When the J hook has hooked onto the anchor wire, the vessel then moves towards the anchor, maintaining adequate tension but slacking on the work wire as well to compensate for the increasing depth. The total amount of work wire paid out shou ld be approx. 1.5 times the depth in which the anchor lies. See diagram no.3 & 4
Diagram NO.3
-
./
-
... " /
/
Diagram No.4
163
7. As the J hook reaches the anchor, the vessel increases power in order to dislodge the anchor from its holding position. See diagram no.S
/
/
/
/
/
/
Diagram No.5 8. As the anchor dislodges from the bottom, the engine power is then redu ced, the work wire is heaved on while still moving ahead. See diagram !lo.6
Diagram NO .6 164
9. As the anchor comes of the bottom, the vessel keeps moving ahead to keep the anchor securely in the J-hook as well as to maintain the tension on the anchor wire. See diagram no.7
Diagram No.7 10. As the anchor comes close to the stern roller while being picked up, it has to be ensured that the fluke s are pointing outwards and away from the stern so as to get the anc hor on the deck with ease (Stevpris, Bruce anchor). See diagram no.8
Diagram No.8 165
C. Procedure for using the chasing block I. Barge connects the chasing block to the anchor wire. See Diagram
.
, . _. ,
.
.-
.
lS
110
9
.,'
, I,
1
I
~
" !
B>' " I) ,
:>.
•
J
Diagram No .9 2. Barge heaves on the chasing block assembly to create a bit of slack. the vessel then backs to the barge, the pig tai l cha in of the chasing block is handed over to the vessel which wil l connect it to the tugger. See diagram no.\O
"
-
. . -.
~
,-
I 1
1 "
!
:to
~
,,'~. -J~~!
. Diagram No .10 166
#
3. The tugger is then heaved on to get the pig tail chain of the chasing block in the shark jaw, once there the tugger is disconnected and the work wire connected. See diagram no II
Diagram No. II 4. The shark jaw is then released and the work wire is paid out as the vessel moves ahead in direction of the anchor target. See diagram no.12
Diagram No.12 167
5. VesseI"keeps moving ahead and paying out on the work wire till the paid out length is approx. equal to 1.5 times the depth in which the anchor is laid. See diagram no.I3
Diagram No.! 3
6. Once the chasing block reaches the anchor, the vessel's engine power increased just to dislodge the anchor f.rom the bottom. See Diagram no.! 4
reb! r
Diagram NO.14
168
IS
7. Once the anchor is picked up the engine power is reduced and the work wire is heaved on till the anchor is on the stem roller. See diagram no.15
Diagram No. 15
8. There are 2 methods in which the anchor ca n be ha nded back to the rig: a. It can be done by the means of the chasing block assembly. b. Alternatively the anchor & the chasi ng block is disconnected and only the anchor wire is returned
9. Anchor being handed over by means of the chasing block assembly. Rig heaves on the anchor wire as the vessel mo ves ahead slowly to keep the tension on the system. See diagram 00. 16
Diagram No. 16
169
10. It is necessary to maintain the tension in order to prevent the ancho. from falling off the stem roller. See di agram no.17 .
Diagram No.17 11. Once the vessel has backed sufficiently close to the rig, the rig is informed to stop heaving on the anchor wire in order to let the crew on the vessel to disconnect the pig tail chain of the chasing block from the work wire and then the chasing block can the be handed over to the rig. See Diagram no.18
Diagram No.I8 170
12. Chasing block handed back to the ri g. See Di agram no l 9.
Diagram No.1 9 In case the rig wants the anchor and the chasing block to be disconnected the following is the procedure for the same: Once the anchor wire socket is in the shark jaw, then the anchor is disconnected, the chasing block is disconnected and so is the work wire. The vessel then backs to the rig as the ri g heaves on the wire, the vessel keeps the tension on the wi re to ensure better spoo ling on the rig side drum.
Note: These days this system is not used as freq uently. Normally the AHTS 's are provided only with a J-Hook which is far easier to handle and since the J hook is far more versati le in its usc . This method has been inc luded io this book so as to enable the reader to be aware of the system.
171
D. Grappling sleep ing chain: To use a grapne l, we need to have a stud link cha in, 2.5 - 3.0 inch diameter and Icngth of not less than 10mtrs. This is to ensure that thc grapnel does not come at an angle such that the flukes are not on the sea bed. As shown in the diagram nO.20 the chain ensures that the flukes are in the correct position.
Diagram No.20 I. The grapnel which is connected with the stud link chain is connected to the work wire on the cnd of the stud link chain. The grapnel is thcn put on the stcm roller and the vessel proceeds to the position. 2. Once the vesse l is close to the position, it pays out 2.5 to 3 times the depth on its work wire, and then proceeds slowly to cross the anchor chain at a ncar perpendicular. See diagram no.21
Diagram No 2 1 172
3. Once the grapnel picks up the anchor chain , the vessel is stopped in the water The work wire is the heaved on till the grapnel is on the vessel's deck. See diagram no.22 and 23
---_"'1:'" Diagram No.22 4. The r.rocedure of picking up the chain on the grapnel may not be successful on the first try, that would need the vessel to tum around and do one more crossing but at a slower speed than the first one so as to ensure that the sleeping chain is on the bottom.
Diagram No .23 173
5. After the grapnel is decked the chain leading to the anchor should be put in the shark jaw. See diagram no.24 It may not always be possible to easily make out which of the two parts of th e chain actually goes to the anchor. There is a easy way of findin g out. T he vessel moves slowly ahead as the chain tens ion out the chain leadin g to th e anchor will have visibly more lension while th e other does not.
Diagram No .24 5.
The chain which does not lead to the anchor, is picked up on the deck. it 's end is connected to the pig tail chain from the chain locker and the chain is then lead into the chain locker. See diagram no.25
']1 ~
I
/'1. J
./(t~-fl}
~
G
~
n
-
r@%t; 1OI§ *:ii:~
-
J~I
,'- ,y
,~
c
Diagram No.25 174
.)
E. Crappling Sleeping Pennant This is to pick up the pennant wire which is lying on the sea bed. I. The grapnel which is connected with the stud link chain is connected to the
work wire on the end of the stud link chain. The grapnel is then put on the stem roller and the vessel proceeds to the position 2. Once the vessel is close to the posi tion, it pays out 2.5 to 3 times the depth on its work wire, and then proceeds slow ly to cross the anchor wire at a near perpendicular. See diagram no. 25
, Diagram No.25
3. It is absolutely imperative that the vessel proceeds at a slow speed so as to avoid damaging the wire once the grapnel has picked up the wire. The anchor wire is going to be tensioned from the anchor side as well as the tension applied by the vessel, so we need to be careful to avoid any damage.
175
4. Once the vessel picks up tbe wire the vessel is stopped in the water, and the work wire is heaved on till the grapnel is decked. See diagram no.26
Diagram No . 26 5. While picking up the work wire along with the grapnel , the vessel needs to keep some amount of tension on the system so that the wire does not slip out of the grapnel, but the tension should be JUS! adequate. See diagram no.27
Diagram No. 27 176
6. After decking the grapnel, the wires should ideally be put into the towing pin, aI least the one which leads to the anchor. See diagram no.28
Ib
Diagram No.28
7. Once the wire leading to the anchor is put into the shark jaw, the work wire is then paid out till the grapnel is against the shark jaw. The tugger wire is then connected to the wire which is NOT leading to the anchor behind the socket by means of a small chain bight or a shackle. Sec diagram no.29
.......
\.
-------.....
~-'-----------~,-----j Diagram No .29
177
8. In order to disengage the wire from the grapnel the second tugger is connected to the grapnel as show in the diagram no. 30. Once the second tugger is connected then the tugger connected to the free end of the anchor wire is then heaved on
Diagram NO.3D 9. Both the tuggers can now be heaved on simultaneously so that the wire will disengage from the grapnel at the same time the grapnel will move to one side. See diagram no. 3 [
Diagram No.31
178
10. Tugger wire connected to the anchor wire is slacked to avoid unnecessary tension on the tugger wire, till the socket is in the shark jaw. See diagram no.32
'il
./'"'1 //
Kt
J
m
h n nJj
~
~
8 --\:'3 ~ 'C
Diagram No.32 I I. Since the illustrations show a vessel which has only one set of towing pin and one karm fork, we will show the method in which a Pelican Hook can be used to disconnect the socket. This system is not preferred by some companies these days and can be forbidden from use. The use of Pelican hooks is a high risk operation and there need to be extra precautions taken to reduce the risk s involved. Pelican hook is a manual stopper which comes in vari ous sizes, it can be used to take from 10 t uplO 110 t.
Closed
o
,,""'=
Pelican Hook 179
12. lo order to disconnect the sockets, the Pelican hook is put on the wire outside the towing pin (th is is the wire which does not lead to the anchor). The tugger is then connected behind the socket on the same wi re. See diagram no.34
Diagram No.34 13. After disconnecting the sockets the tugger is then paid out till the socket comes fast on the Pelican hook. Once in the Pelican hook, the work wire is
then connected to the socket of thi s wire. See diagram no.35
'"
Diagram No.35 180
14. Work wire is then heaved on till the tension on the Pelican is hook is taken off the heaving on the work wire is now paused. Once the Pelican hook is free of any tension it can be opened and the tugger wire can also be disconnected. After this the work wire is heaved on to spool the wire into the handling drum. See Diagram no.36
Diagram No.36 15.ln the diagram no.37, the vessel is shown to have 2 sets of towing pins and 2 Karm forks, this makes the above operation safer and the use of Pelican hook unnecessary.
Diagram No.37 181
Photograph shows a vessel with 2 sets of towing pins and 2 Karm forks.
KARM FORK
Photograph shows a vessel with only one sct of towing pins and one Kaml fork .
KARM FORK 182
Photograph shows the Shark Jaw holding the chain.
SHARK JAW AN D TOWI NG PIN
Photograph s shows the vessel with 2 sets of lowing pins and 2 Shark jaws, one of the shark jaws in open position and the other is closed.
SHARK JAW
183
CHAPTER XI HANDLING CHAIN A. Introduction
The operation of handling anchors and chain is one that involves a 101 or hard work; it can be exhausting and exhilarating all at the same time. Done professionally, it can be a very rewarding experience. For these operations in volving chains, vessel's with high power ratings aTC used. as well the vessel shall have a heavy duty winch as nannalty the chains used are of 3 inches and above. These chains arc normally used by semi submersi bl es, FPSQ's and drilling ships. or at times by barges. In order to be efficient in the operation and to derive a satisfactory result, we need to follow the 3 methods li sted below I. Understand the scope of the job. 2. The vessel's crew needs to explained the plan and procedure expected from them. 3. The equipment involved in the operation has to be in a good condition and ready to use, A small AHT shown taking the chain into it 's chain locker.
184
Deck crew is shown putting tack welds as additional locking on the shack le.
Deck crew shown arrangin g the chain on the deck
There are times when the cha in maybe laid out on the deck . Following maybe some of the reasons why there would be a need to do so : I. The size of the gypsy is incompatible with that of the chain. 2. Chain locker cannot contain the full length of the chain within.
185
Anchor handling vessel in the process of hooking up the FPSQ. The pig \ail chain is about to be connected to the anchor chain.
Chain is rcady to be released from the Karin Fork
186
B. Preparation for handling chain I. lnfonnation that should be available prior chain handling: a. The gypsy 's compatibi lity with the in tended chain. b. Chain locker capacity c. Once the gypsy and the chain fou nd compatible and the chain locker capacity found adequate, the pig tail chain is marked and also the points where the Kenter link shackles are used. d. Hydraulic Stopper chain ( insert used should be for a chain, of the size being worked) e. All the tools which are to be used should be available readily on deck. f. Manual stopper chains should also be on deck, if available. 2. Understand the scope of the job. Ifnot clear, clarify till you are satisfied. 3. Explain to the ship 's crew the intcnd ed job and the plan to carry it out. C. Putting the chain to the chain locker. I . When putting the chain into tbe chain locker, it need to be joined to a Kenter Link shack le which is of the same size as that of the chain being handled . As shown in the diagram no. I
- d
4< ': : --.
o
Cornmon link
i Co,mmo n l lilk
Diagram No .1
187
2. Diagram no.2 shows the chain ranged on deck bc ing put into the chain locker, by means of a pig tail chain. Pig tail chain is a chain that serves the purpose of a messenger to carry the chain from the deck, spool over the gypsy and into the chain locker and vice versa.
RHkj; M
\=\
1=1
lin
0
DO ....
0
--Diagram No.2
188
3. The pig tail chain is connected to the chain which is to be pUl into the chain locker. See diagram no. 3
~H kt M
r't=t
\=\
~
V
I
0
...
vO
0 ~
Diagram No.3 189
---
Pig tail chain
3. The pig tail chain is connected to the chain which is to be put into the chain locker. See diagram no.3
R H kj '1
J
'"/::I
~
0
\.,
pO
'"
Diagram No.3
189
V ----
0
Pig tail chain
D. To lead the chain from the rig into the chain locker. I. Anchor chain connected to the pennant is put into the shark jaw. See diagram no.4
Diagram No.4 190
2. After discon necting the pennant, a small rope of 25 mtrs length and about Yz inch dia is connected to the pennant and the pennant is the coiled onto the drum. The rope serves as a way of securing the socket on the drum . Thi s may need to be done, if the gypsy and the anchor handlin g drum cannot be di sengaged from each other. This ensures that at the time of putting the chain into the chain locker, the wire and the socket do not move around or slack on their own. See diagram no.5
o
Diagram No.5 19 1
3. Pig tail wire is connected 10 the tugger wire which is lead arollnd the towing pin and then the tugger is heaved as the gypsy slacks to lead the pig tail chain to the chain at the shark jaw. See d iagram 00.6
Diagram No .6 192
4. Pig tail chain being brought out should ideally come out with a small lateral separation to the chain at the shark jaw, to faci litate an easy connect. See diagram no .7
o
o
Di agram No. 7 193
5. Pig tail chain is connected to the chain, the shark jaw is opened and the gypsy heaves to stan picking up the chain into the chain locker. See Diagram no. 8
~HMI::j ~
""1=1
"
L
)0
0
---
a
Diagram No.8 194
0
----
Photo shows the A HT handling a double anchor chain.
Photo is a close up of the delta plate shown of the double chain above.
195
CHAPTER XII USEFUL TABLE, FORMULA AND DATA . A. Mooring line calculation - Formula abbreviation T
Tension at fairlead or winch. It is both a horizontal and vertical componenl
W
Weight per unit length of the mooring line sea water
S
Suspended length of mooring line
Of
catenary (
*
see note below) from
point suspension (Fair lead to touch down) D
Horizontal distance between fairlead and louch down or between two
points of suspension d
Depth between point of suspension and seabed
C
Catenary depth distance of lowest point of mooring line below sea surface when suspended between barge and work boat
V
Vertical component of mooring line tension
H
Horizontal component of mooring line
Note: Catenary in this context means half catenary
Not on unit
Tension - in kg ; line distance - in meters Weight per length - kg per meter ; (Water) depths - meters
Imperial units
Tension - in pound; Line distance - in feet Weight per length - pound per foot; depth - fe ct
Note
I kip
~
9.81kn
1000 Ibs ~
101.94 kg
196
B. Mooring line catenary ' s
Suspension point - usually fairleader
~==~+---+c~~----------------------------------------- Seasu~ace
d - Distance from suspension point to seabed
S - Suspended length or scope referred to as the catenary
~
[
---'--------,,------------------------------""0-:,----------Seabed
'~
D
Touch down distance
.'
Tension T - tension at fairleader as sensed by winch - line tension V - vertical component of mooring line tension
H
Horizontal component of line tension
Mooring " pull down
197
, ~ -/.~_""
C. Mooring line calculation b. Touchdown distance
a. Suspended length T
T
I,
1,
s
1
1
D
1 '
,1
T.,CO'"' [; ]
s · -
Iw .,
W
d. Vertical tension
c. Horizontal tension
V T
T --------------~+-~H
i V
j r.
c. Catennary depth
" C':' .:' W
Distance between suspcnsions poin t
J,.[ w,],
W
~~.
s
,., l' ~c1
TS
198
D. Calculated Example: A. A semi submers ible has 1400mtrs of chain on each mooring line chain size 76mm diameter ORQ-3. [fit is to be moored in [80 meters of water, what will be the suspended length and the touchdown point of the mooring lines when the barge experiences survival stann (approximately Y:z breaking strain) . Draft mooring line fairleads are 8 meters below [he surface .
:.-- --- - --- - -------- D
. ---- - --- ---- -- ~
"
.....,
, ,, '
,,
,
rl 172
lROm
1
"-- -
Chain 76 mm diametcr break load 471 tons ... Y2 BL =236 W= I 18kglmtr Suspended length
Touchdown
T D~ _
T
- d CosH -1 W-
W
T
-
-d W
s=
236000 2x 172x
-17z2
D~
118
S ~688000 - 29584
s~
658416
s = 811.4
meter
236000 11 8
- 172 CosH~ ' 236000 118 236000 _ _ -172 118
D = 1828 CosH-l
Gooo] ~828
D~1828CosW ' [1.0941]
D ~ 1828 x 0.43
When the rig deploys 1200 meter chain, at survival tension, ± 400 metcr are still on the seabed.
199
D = 786.0 mete r
CHAPTERxm SAFETY PROCEDURES A. Introduction The Anchor handling operations have always carried a certain amount of risks. which lead to near misses, accidents and at times fatalities. The operation needs to be carri ed out only after the risk analysis has been done, the hazard level lowered to an acceptable level. It is of Paramount importance that the " Safety First" motto be taken extremely seriously. Towards this end it is important and it cannot be stressed enough that the vessel is properly equipped, there is clarity on the kind of operation to be carried out, the crew has the professional knowledge and the safety awareness to do the same. This chapter outlines the safety procedures which are not all encompassing but the salient points that need to be looked at.
B. Preparing for a Rig Move. The Charterers or the Owners rep shall come job to be undertaken:
OD
board to discuss the scope of the
I. Anchor patterns to be discussed, the procedure and order in which the anchors have to be run or retri eved 2. Method of com munication and the frequencies to be used. 3. Whilst the rig is under tow, contingency plans to need to be drawn to take care of possible emergenci es . 4. Survey equipment that is to be used should be insta lled pri or commencing the operations . 5. Inspection of the equipment that is involved should be carried o ut.
C. Personal Protective Equipment The crew should all be in possession of their Personal protective equipment like: Cover Ails with retro reflective tapes, Safety Shoes, Goggles, Helmets wi th chin strap, Hand Gloves Heavy Duty, Work Vest, Bosun Knife. It is also the responsibility of each member of the crew to check his own PPE and ask for ap.y of the items that he needs if he is not already in possession of the same.
D. Tool Box Meeting Often accidents happen when there is a lack of co-ordinati on of the various teams working on board. The best way to avoid such a situation is to plan your work and work you plan. The too l box meeting is the planning part where the crew shall be briefed about the operations that are to be carried out. If possible each individual could be given specific tasks keeping in mind the experience levcl of the person. The crew can rai se doubts and have them cleared at thi s point so that atl involved know the plan ..
200
E. Job Hazard Analys is Job hazard analysis is a important tool and can be used to great advantage if used well. It is to identify various possibilities and scenarios and the likelihood of their occurrences. Once identified the vessel can take action to reduce the risks involved and prevent incidents from occurring at all. F. Communications We all know that communications are an important part of the operation. Whilst communicating the use of Walkie talkies is preferred and the loud hailers can be used as a means of emergency communication. Comm uni cation to be short. clear and always 2 way. All instruction to be repeated and once carried out reponed. If any instructions are unclear, do not proceed without clarification. Use of water proof walkie talkies with microphone attachment is good as these can be clipped onto the work vests.
G. Lighting. Good ligh ting is difficult to achieve on the stem end of a anchor handler for close up work, despite the modem ships having large arrays of floodlights. Temporary power leads could be rigged on each side of the deck between bulwarks and crash rail and a water proof portable Halogen floodli ght witb 10-15 mtrs of cable could be used. Water proof sockets are used on the ends of the power leads. Thi s lamp cou ld be directed to the shark jaws. It is important to ensure that the vesse l has enough spares.
H. Shark jaw/ Karm Fork mechanical stoppers. Shark jaws and Kann forks are mechani cal stoppers which holding the wire/chain. These arc excel lent when operated by a can be dangerous if in the wrong hands. Only one person should carry out the operation. The final authority of course lies with the
are effective in professional but be designated to Master.
I. Buoy and anchor I f the anchor and the buoy is to be on the deck, it follow s that these need to be lashed properly with lashing chain and binder. Once the anchors and buoy are on deck their lashing is a priority. J . Rest Hour To avoid fati gue induced accidents the STeW 95 specifies work and rest hours. If the vessel is to work 24 hours there should be 2 sets of crew to work in rotation. The Master could be relieved by the Auxiliary Master/Chief Officer on the bridge, the elEng by the Second Eng. K. Stop Work Policy All the personnel involved in the operation have the authority to bring the operation to a halt if they see any condition which they feel is unsafe or can be a potential hazard to the operation. The operations can be resumed only after the situation has been effectively addressed.
20 1
L. Log Book And Record. Record and log keeping on a vessel chartered for anchor handling can involve a few logs as in the Official Log, Company log, Charterers log, Anchor handling log. Given below are a few examples of the same.
Exampl e: Time
Re[rieyin~
anchor (PCC) Description Arrival al bar.2;e chase permant connected Start chase out Anchor off the bottom Anchor at roller Anchor racked Pennant handed back
Remarks
Example: Running anchor (pee) T ime
Description Pennanl pee connected Anchor at roller Start run out Anchor on bottom Chaser stripped off Pennant handed back
Remarks Anchor No.
Example: Handling buoy (Retrieving anchor) Time
Description Buoy on deck Anchor off the bottom Anchor at roller Anchor racked Pennant handed back
Example: Handing buoy (Run anchor) Description Time Buoy on deck Anchor off the bottom Anchor at roller Anchor racked Pennant handed back
Remarks Anchor No.
Remarks Anchor No.
If in case of piggy backs there is additional infonnation to be logged as to the type of anchor, it 's weight, the length of its pennant and the number of Pear link. Kenter link shackles used . Any damages to the buoy, anchor, pennant wire/chain, pear link, kenler link shackles or other equipment should be reported to the rig and also logged in the ships log .. 202
M. Check List
Anchor Handling and Towing Checklist
I Vessel: No
1
2 3
4 5 6
7 8 9
10 11 12 13 14 15 16 17 18
I Location:
I Date:
Items Check Meeting Held on Board, discussions include: Pennant Lengths Links Sequence of Anchor handling Tow Routes Navigation warni ~ _ Stand otT posi tion BA Charts updated and Charter Charts available VHF working Channel agreed CH: Alternative Channel agreed CH: Deck Space C lear Towing, work and tugger wires in good condition Towing, workin g and tugger winches operational Towing pins tested and operational Shark Jaws/Karm forks operational Stem roller in good working order Sufficient Spare Shackles, sp lit pins and wires Engines and Thruster in good working order Navigational equipment in good working order Light and day signal s available/working Job Hazard Analysis with crew carried out Designated person to direct lifting operations with rig, Banks man jacket available Towing stretcher ready, inspected, good condition Hand-over of low between tug and tow master discussed Routine and emergency communications agreed upon telephone numbers exchanged
Master Name: _ _ _ _ _ _ _ _ __ Master 's Signature: _ _ _ _ _ _ _ __
203
Check with " v'" or "NA ,. v' orNA Remarks
N. Hand Signal HAND SIGNAL FOR C RAN OPERA TOR
.
~ .
b;1T:'
~J
R
c.:o ley-
,
,
CLENCH AND UNCLENCH FINGERS TO SIGNAL 'TAKE T HE STRAIN' OR 'INCIl TIlE LOAD'
,.
-
K
\,)
STOP
\'~~r \ , ,,I ,
~_
Q
,
EMERGENCY STOP
fA
• I
~
~I\-
o
,
,
,
HOIST
(~~-!>
LOWER
q.:::), -"~ ~[!
SLEW IN DIRECTION INL>ICATED
15
!~~
JIB UP DERRICK ING JIB
~
~~ ~':_;';' (
~
0
I
~,:
,
~
lti /<~[;
"
•
JIB DOWN
"..
q\~
Sigllal with une ~ ( hand, other h;mu on head
RETRA~ JIB
EXTEND JIB TELESCOPING JIB
-"
p~~ - -
~~'r ~
T RAVEL TO ME. TRAVEL PROM ME. SIGNAL W ITH BaTH HANDS
OPERATIONS CEASE
204
BIBLIOGRAPHY I. Mic hael Hancox Oil Field Seamanship anchor bandling Volume 4 2. OLFINSA Safe anchor handling and lowing. 3. Guidelines for the safe management of offshore suppl y and anchor hand lin g operation
4. Vryhof Anchor Manual 5. Maersk Anchor Handling Course S imulator.
205
