BOOK 12 [BGO]

DESIGN-IV: MACHINERY BASIC DESIGN TECHNICAL SPECIFICATION OF OILY WATER SEPARATOR (OWS) SYSTEM

ATTACHMENT NO. NUMBER OF PAGES

01 3

DOCUMENT NO.

02 01 REV.

02 2

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DOC. NO. 12 - 42 09 050 - BG

09/5/12 Categorizing Eq. I Gusti N. Dirgantara 04/4/12 Document Format DATE

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DESCRIPTION

PREPARED BY

Ir. Dwi Priyanta, MSE.

Ir. Hari Prastowo, MSc.

CHECKED BY

APPROVED BY

DESIGN-IV: MACHINERY BASIC DESIGN

Project : DESIGN IV

TECHNICAL SPECIFICATION OF OILY Doc. No : 12 - 42 09 050 - BG WATER SEPARATOR (OWS) SYSTEM Rev.No : 02 Type

: Table of Contents

TABLE OF CONTENTS PHILOSOPHY DOCUMENTS 1. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1. . . . 1.1 Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1. 1.2 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1. 2. REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1. 3. ABBREVIATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1. 4. DESIGN PARAMETER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 4.1 The summary of Doc. No. 11 .- .42. .09. .050 . . -. BG . . . . . . . . . . . . . . . . . . . . . . . . . . . .1. . . . . . . . . . 4.2 Main Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 5. DESIGN REQUIREMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 5.1 PUMP ............................................... 2 5.2 VALVE AND FITTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2. . 6. SUMMARY ............................................... 2 ATTACHMENT NO. 01 - CALCULATION 1. Oily Bilge Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2. Pump Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3. Power of Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 4. Volume of Bilge Well. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 5. Volume of Oily Waste Collecting . . . . Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 . . . . 6. Volume of Slude Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 ATTACHMENT NO. 02 - BILGE OIL PUMP SPECIFICATION 1. Application and Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1. 2. Performance and Dimension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.

Project : DESIGN IV


: Philosopy

1 INTRODUCTION 1.1 Description In this document, we will design a bilge system in the engine room. In the engine room, we will find an leakage of oil that became from any machinery and pipe. Therefore, the oily bilge system is designed automatically operate as the primary bilge system in the engine room spaces. We need to consider about the mixed of oil and water in the engine room. We can not sent the water out if that has an oil, according to Marine Pollution statutory. And then we need a Oily Water Separator (OWS). Where, its function is to separate the water from oil content up to 15 ppm. In OWS it has an oily content monitor to control the content of oil in the water. If the content of oil in the water less than 15 ppm, we can sent the water out thorugh the overboard, if more than 15 ppm, the OWS system will sent the mixed to the sludge tank to have a circulating again, and the 1.2 Objective The purpose of this document is to design the bilge system in the engine room with oily water separator (OWS) system. 2 REFERENCES a. Germanischer Lyoid Rules and Guidelines 2011 b. Marine Engineering, Roy L. Harrington, "Chapter XX - Piping System" :1971 3 ABBREVIATIONS vs = Velocity of fluid dm = Inside diameter t = Wall thickness and time Q = Qapacity Rn = Reynold number n = viscocity hs = head static hp = head pressure hv = head velocity hf = head friction hl = head losses H = head total 4 DESIGN PARAMETER 4.1 The summary of Doc. No. 11 - 42 09 050 - BG NO CALCULATION SYMBOL 1 inside diameter of bilge pipe dH 2 inside diameter branch bilge line dZ 3 capacity of bilge pump 4 head total pump Bilge Pump Specification Merk = Hyundai Type = HCP300 Qapacity = 1800 m3/h Head = 150 m Frequency = 60 Hz Power = 125 kW

Q H

RESULT 8.75 inches 4.97 inches 283.83 24.46

TECHNICAL SPECIFICATION OF OILY WATER SEPARATOR (OWS) SYSTEM

m3/h m

Project : DESIGN IV

Page 3 of 12

TECHNICAL SPECIFICATION OF OILY Doc. No : 12 - 42 09 050 - BG WATER SEPARATOR (OWS) SYSTEM Rev.No : 02 Type 4.2 Main Engine 1. BHP 2. SFOC 3. ρ HFO 4. Time 1 trip

= = = =

6320 173 0.991 4

: Philosopy

kW gr/kWh ton/m3 days

5 DESIGN REQUIREMENT 5.1 PUMP - Oily Bilge Pump i. head static ii. head pressure (the pressure in the suction and discharge has the same value) iii. head velocity (the velocity in the suction and discharge has the same value) iv. head losses viscocity (n) = 1.1 cst in 50oC

6 = n/10

m2/s = 0.0000011 Reynold number (Rn) Rn . . . =. . (vs*ds)/n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (1) .............. l . .= . .0.02+0.0005/D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .(2) ............... Mayor losses (hf) 2

hf . . . =. . l*L*v . . . ./(D*2g) . . . . . . . . . . . . . . . . . . . . . . . . . . . . (3) .............. Minor losses hl . .= . .k.total*v2/(2g) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .(4) ............... Therefore, the total of Heads are: H = hs+hv+hp+hf1+hf2+hl1+hl2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .(5) ............... - Pump Capacity 3 The capacity of bilge pump to be arranged = 50 m /h Volume of Slude Tank Accroding to ANEX I MARPOL 73/78 chapter II Regulation 17, the sludge tank capacity can be calculated by the following formula below: V . . . =. . K. .x .C. x. D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (6) ........... CFO = P main . . . .engine . . . . .x. SFOC . . . .x. T. . . . . . . . . . . . . . . . . . .(7) ................. VDO = 0.15 X CFO . . . . . . . . . . . . . . . . . . . . . . . . . .(8) ......................... - Type of Pump Gear Pump This is the simple rotary positive displacement pumps. It consist of two meshed gears rotating in a closely fitted casing. Fluid is pumped around the outer periphery by being trapped in the tooth spaces. It does not travel back on the meshed part, since the teeth mesh closely in the centre. The example will be given by Figure 1.1 Gear Pump below.

Figure 1.1 Gear Pump


Project : DESIGN IV

Page 4 of 12


: Philosopy

5.2 Valve and Fitting a. Type In oily-water bilge system will be used valve and fitting such as; 1. Butterfly Valve A butterfly valve is a valve which can be used for isolating or regulating flow. The closing mechanism takes the form of a disk, which allows for quick shut off. Butterfly valve are generally favored because they are lower in cost to other valve designs as well as being lighter in weight, meaning less support is required. Used for stop valve only, for low working pressure. In this system, butterfly valve used in order before the pump, and as a connecting to another equipment to make a standby function. Below is the example of butterfly valve, shown in Figure 5.3 Butterfly Valve.

Figure 5.3 Butterfly Valve 2. Remotely Butterfly Valve Remotely Butterfly Valve has the same function with butterfly valve but in this valve has remote as an automation control. It can be controled from another place to make it work automatic. This valve need another system in automation and cost especialy. In this system, remotely butterfly valve used in stripping system in each cargo oil tank. Because the hard acces situation and then need an automation system according to the safety conditon. 3. Non Return Valve Has same function with globe valve, working in very high pressure and just has one-way direction. Usually this valve is used in order after the pump and another lines that the fluids shall not back through the same line or just one-way direction. 4. Three Way Valve and Angle Valve As a connect of pipe with simple used. 5. Filter Hyraulic filters are very useful for removing solid contamination from lube and fuel oil system of marine machinery. Withous filters in the lube or fuel oil system, the machinery internal parts, bearing, piston, rings, liners etc. can get damaged, which will result in inefficient working of the machinery. In this system will be used Centrifugal Filter. These filters work on the principal of centrifugal force removing high density fluids and impurity from the oil. It is normally used for lube oil systems. Most of the auxiliary engines have attaced centrifugal filters. The example will be shown in Figure Project : DESIGN IV


Page 5 of 12


: Philosopy

Figure 5.4 Centrifugal Filter b. Class Recommendation - Bilge Suction and Strums Bilge suction are to be arranged as not to impede the cleaning of bilges and bilge well. They are to be fitted with easily detachable, corrosion resistant strums. Emergency bilge suction are to be arranged such that they are accesible, with free flow and at suitable distance from the tank top or the ship's bottom. For the size and design of bilge well, will refer to GL Rules for Hull Structure (I-1-1), Section 8, B.5.3. Bilge wells shall have a capacity of more than 0,2 m³.Small holds may have smaller bilge wells. For the use of manhole covers or hinged covers for the access to the bilge suctions, see Chapter 2 – Machinery Installations, Section 11. Germanisher Loyd, Chapter 2, Section 11 - Piping Systems, Valves and Pumps Page 11-36, 1.3 - Bilge Valves Valves in connecting pipes between the bilge and the seawater and ballast water system, as well as between the bilge connections of different compartments, are to be so arranged that even in the event of faulty operation or intermediate positions of the valves, penetration of seawater through the bilge system will be safely prevented. Bilge discharge pipes are to be fitted with shut-off valves at the ship's shell. Bilge valves are to be arranged so as to be always accessible irrespective of the ballast and loading condition of the ship. Germanisher Loyd, Chapter 2, Section 11 - Piping Systems, Valves and Pumps Page 11-36, 1.4 - Reverse-Flow Protection A screw-down non-return valve or a combination of a non-return valve without positive means Germanisher Loyd, Chapter 2, Section 11 - Piping Systems, Valves and Pumps Page 11-36, 1.5


Project : DESIGN IV

Page 6 of 12

TECHNICAL SPECIFICATION OF OILY Doc. No : 12 - 42 09 050 - BG WATER SEPARATOR (OWS) SYSTEM Rev.No : 02 Type 6 SUMMARY NO 1 2

CALCULATION Head Total Inside Diameter

SYMBOL H Dm

RESULT 27.228 97.18

: Philosopy

m m

3

Volume Bilge Well

1.08

m3

4

Volume Oil Waste Tank

4.5

m3

5 Volume Sludge Tank Pipe selection according to ANSI Inside diameter (dm) = 97.18 mm Thickness = 8.5598 mm Outside diameter = 105.74 mm Nominal pipe size = 4

1.83

m3

Oily Bilge Pump Merk = Iron Pump Type = ON-V : 50/10 Capacity Head Rpm Power

= = = = =

53 35 950 12 8.8

m3/h m rpm HP kW

Page 7 of 12

DESAIN-IV: MACHINERY BASIC DESIGN

ATTACHMENT NO. 01 CALCULATION TECHNICAL SPECIFICATION OF OILY WATER SEPARATOR (OWS) SYSTEM

Project : DESIGN IV


1. Oily Bilge Pump i. head static = 9.55 m ii. head pressure = 0 m iii. head velocity = 0 m iv. head losses a. suction viscocity (n) = 1.1 cst in 50oC

=

: Attachment No. 01

(the pressure in the suction and discharge has the same value) (the velocity in the suction and discharge has the same value)

n/106

m2/s = 0.0000011 Reynold number (Rn) Rn . . .=. .(vs*ds)/n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (1) ........... = (2.5*(222.176*10^-3))/0.0000011 = 504945.5 For the frictional losses (l) will be determned if the value of reynold number <2300 will be used formula Re/64, and if not the following formula is 0.02+0.0005/D l = . .0.02+0.0005/D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (2) .............. = 0.02+0.0005/222.176*10^-3 = 0.022 Mayor losses (hf) hf

2

. =. . l*L*v . . . ./(D*2g) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .(3) ............ where, L = the length of suction pipe = 17 m for the result

2 = l*L*v /(D*2g) = 0.022*17*(2.5^2)/((222.176*10^-3)*2*9.8) = 0.54 m Minor losses (hl) No Types n k nxk 1 anggle v/v 1 1.05 1.05 2 butterfly v/v 6 0.86 5.16

hf

3 4 5 6 7

Elbow 90o Filter SDNRV T connection Three way valve

minor losses

= = =

17 7 6 4 4

0.57 9.69 1.5 10.5 1.23 7.38 1.14 4.56 0.57 2.28 total 40.62 k total*v2/(2g) . . . .(4) ............................................... 40.62*(2.5^2)/(2*9.8) 12.953 m

b. discharge Minor losses (hl) No Types 1 anggle v/v 2 butterfly v/v

n 2 6

k 1.05 0.86

nxk 2.1 5.16

3 Elbow 90o 4 Filter

0 0

0.57 1.5

0 0

Page 9 of 12

Project : DESIGN IV


No Types 5 SDNRV 6 T connection 7 Three way valve

n 2 1 1

k 1.23 1.14 0.57 total

: Attachment No. 01

nxk 2.46 1.14 0.57 11.43

minor losses

= k total*v2/(2g) = 11.43*(2.5^2)/(2*9.8) = 3.645 m Therefore, the total of Heads are: H = hs+hv+hp+hf1+hf2+hl1+hl2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (5) .............. = 9.55+0+0+0.54+0.54+12.953+3.645 = 27.228 m 2. Pump Capacity The capacity of bilge pump to be arranged = 50

m3/h

3 = 0.013888889 m /s Inside diameter (dm) = (50*(10^3)/5.75)^0.5 = 93.25 mm Pipe selection according to ANSI Inside diameter (dm) = 97.18 mm Thickness = 8.5598 mm Outside diameter = 105.74 mm Nominal pipe size = 4 3. Power of Pump Oily Bilge Pump Merk = Iron Pump Type = ON-V : 50/10 3 = 53 m /h = 35 m = 950 rpm = 12 HP = 8.8 kW 4. Volume of Bilge Well The design of dimension Legth = 0.6 m Breadth = 0.6 m Depth = 0.5 m

Capacity Head Rpm Power

Volume

= 0.18

m3

Will be planned 6 bilge wells, therefore the total volume = 5. Volume of Oily Waste Collecting Tank The design of dimension Legth = 1.8 m Breadth = 2.5 m Depth = 1 m

1.08

m3

m3 Volume = 4.5 6. Volume of Slude Tank Accroding to ANEX I MARPOL 73/78 chapter II Regulation 17, the sludge tank capacity can be calculated by the following formula below: V =. .K. x. C . .x.D. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .(6) .......

Page 10 of 12

Project : DESIGN IV


: Attachment No. 01

where, K = 0.015,that used HFO fuel and purifier 0.005, that used MDO fuel or HFO without purifier C

3 = daily fuel consumption [m ]

γ FO CFO

3

. =. . . .0.991 . . . . .Ton/m . . . . . . . . . . . . . . . . . . . . . . . . . .(7) ............... = P main engine x SFOC x T = 6320*173*24*10^-6 = 26.2406 ton

3 VFO = 26.479 m VDO . . .=. .0.15 . . . X. .CFO . . . . . . . . . . . . . . . . . . . . . . . . . . . (8) .............. = 0.15*26.479

= volume total

4 = =

m3 VFO+VDO 26.479+4

m3 = 30.48 D = the day time of one trip for the result: V = KxCxD = 0.015*30.48*4 = 1.8288

m3

Page 11 of 12

DESAIN-IV: MACHINERY BASIC DESIGN

ATTACHMENT NO. 02 BILGE OIL PUMP SPECIFICATION TECHNICAL SPECIFICATION OF OILY WATER SEPARATOR (OWS) SYSTEM

BOOK 12 [BGO]

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