03. bilge system_2009_rev1 [compatibility mode].pdf

7/23/2019 03. Bilge System_2009_rev1 [Compatibility Mode].pdf

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03 Bilge Systems & OilPollution Prevention

Course No. 2004


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Slide 2

Bilge system (Pt.4 Ch.6 Sec.4)

Purpose: Emergency evacuation of large amounts of water

Efficient drainage system for all tanks and watertight compartments

- Voids may be drained by portable equipment

Dry compartments: Effective drainage through at least one suction even ifthe ship has a list of 5 -> normally need for wing suctions, except in short

and narrow spaces


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Slide 3

Bilge system

Sea water shall not be able to unintentionally enter dry compartments, orpass from one compartment to another

- Two non-return valves in series are to be installed between sea/ballastsystem and bilge suctions

- Except: Direct and emergency bilge suctions in the E/R.

For these one non-return valve is acceptable

- All direct and branch suctions are to be fitted with screw-down non-returnvalves


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Slide 4

Bilge system

At least 2 pumps

- Both independently driven for ships > 90 m , one may be engine driven forsmaller ships

Centrifugal pumps to be self-priming or connected to central primingsystem

The bilge pumps to be delivered with DNV certificate


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Slide 5

Bilge system- Machinery space cat. A

It should be possible to pump out any water through at least 2 suctions

- Bilge suction

- Direct suction

3 branch suctions

1 direct suction from each

side of the space

If an emergency suction is arranged to a self-priming pump, the directbilge suction may be omitted on the side of the emergency suction.

unless floor has rise > 5 degrees,

then 1 bilge suction and

1 direct suction near centre line

is acceptable


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Slide 6

Bilge System

All bilge pump connections to the main line are to be fitted with stop valves.

The bilge pumps are to be so arranged that either can be used while the other is

being overhauled.

The direct bilge suctions are to be so arranged that they can be used at the same

time as the other bilge pumping unit is drawing from the main bilge line.


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Slide 7

Bilge System

Main Bilge Line;

L = Distance on the summer load waterline from the fore side of the

stem to the axis of the rudder stock (SLWL LBP) (m)

B = Greatest breath of ship at summer load waterline (m)

D = Vertical distance from baseline to uppermost continuous deck

measured amidship (m).

D = 1.68 L(B+D) + 25 (mm)

Branch Bilge :

1.68 2.15

L 1

1 = length of space


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Slide 8

Bilge System - E/R

d 1.4 branch bilge suction diameter

If emergency suction is fitted, the diameter is to be taken equal to that ofthe suction side of the pump.

Need not exceed 400 mm

But

Direct Bilge Suction Line;

But, need not exceed the diameter of the main line.


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Slide 9


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Slide 10

Bilge System

Bilge Pumps;

Capacities :

Q = 5.75 d / 10 [m / h]

d = Normally

Main bilge diameter

Tankers (where the E/R pumps are not used for bilge drainage

outside the machinery space) :d - may be based on

2 A (branch bilge for E/R)


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Slide 11

Bilge system

Note: Locked overboard valves from main bilge system is neveraccepted (sometimes suggested for mistaken oil pollution preventionreasons)


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Slide 12

BILGE SYSTEM E/R

B.W.

VOID SPACE

WASTEOIL

TANK

BILGE

HOLD G

TANK

FROM SEWAGE COLL. TK

SEE P/D OF ACCOMODATION

S/T COOLING

WATER TANK

A.PTANK

STEERINGGEAR ROOM

F.W.TANK

B.W.(AFT)

BILGE WATERTRANSFER P/P

B.W(S)

B.W(P)

EM/CY

BILGE

SUCTION

NO.1 MAIN

C.S.W PUMP

(self !"#"$%)

FIRE

&YDRANTS

FM S.W MAIN

CROSSOVER LINE

BILGE' FIRE

G/S PUMP

OILY

WATER

SEPAR

ATOR

OILY

WATER

SEPAR

ATOR

FM FRES& WATER

SUPPLY SYSTEM

UPP.DK

DIRECTBILGE

SUCTIO

N

TOS

&ORE

DISC&.CONN.

NO.1NO.


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Slide 13

Bilge system

If E0 notation:

- Bilge injection system valves and ship side valves to be operable after 10minutes flooding through the outlet in question (Pt.3 Ch.3 Sec.6 K400)

Additional requirements for

- Passenger ships (SOLAS)

- Fishing vessels

- Bulk carriers: Cargo holds water ingress alarm- handled by instrumentation

people, forward spaces dewatering system- Tankers and supply ships: Separate systems in cargo area and engine room/

accommodation

- Dangerous goods cargo holds Pt.5 Ch.11 Sec.2 B600

- Container ships- Pt.5 Ch.2 Sec.6 K200


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Slide 14

BILGE SYSTEM- E/R

Please review the below design and present your comments, if any.Case 4:

TOS

&ORE

DISC&.CONN.


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Slide 15

Bilge System - E/R

- Main bilge line

- Branch bilge lines

- Direct bilge suction line- Bilge pumps

L = 265mB = 40m

D = 25ml = 50m

Please calculate the size/capacity of the:Case 5:


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Slide 16

Oil Pollution Prevention - E/R

Purpose of the rules and regulations;

To Prevent pollution by discharge of oily water and oil residues from E/R.

To achieve safe and reliable handling of oily water and oil residues.


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Slide 17


General requirements ;

Fore peak tanks and other tanks forward of the collision bulkhead are not to be arranged

for carriage of oil.

New MARPOL requirements for protected fuel tank location (MEPC141(54))

Tanks to be located away from ship side

Applicable for ship with more than 600 m3 fuel oil capacity that are

Delivered on or after 1 August 2010 or

Have contract on or after 1 August 2007 or

Are keel laid on or after 1 February 2008

Combined fuel oil and ballast water tanks are normally not permitted.

Requirements applicable for ships of 400 GRT and above.


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Slide 18

Oily Bilge Water

Operational bilge water is normally collected in the bilge water holding tank,which generally is maintained at an elevated temperature.

This high temperature facilitates primary separation due to the force of gravity inthe bilge water tank and preferably is of the two- or three-stage type.


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Slide 19


An oily-water separating/oil filtering equipment to be installed

Capable of producing effluent with oil content of less than 15ppm

(5 ppm for CLEAN DESIGN).

For ships above 10,000 GRT;

- Alarm > 15ppm (acoustic & visual)

- Automatically stop discharge to sea- Direct discharge to bilge tank/bilge well.

For special areas this requirement is also valid for ships

of less than 10,000 GRT.

Requirements to transferring system ;


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Slide 20

Requirements to oil residue handling system ;


Collecting tank(s) for oil residues

Including sludge,waste oil, drain oil etc.

is to be arranged with a minimum aggregate capacity of ;

V = K C D (m)

K = 0.015 if HFO is purified for M/E use.K = 0.005 if fuel oil does not need purification.C = Daily fuel oil consumption (m).D = Length of voyage in days, but not less than 30 unlessrestricted service notation.

Where the ship is fitted with sludge incinerator, the tank

capacity may be reduced by 50%


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Slide 21


Where HFO is purified onboard, at least 80% of the above capacity is tobe in tank(s) suitable for sludge from the purifiers.

Tanks for oil residues are to be arranged with suitable access possibilitiesto facilitate cleaning.

Tanks for sludge from HFO purifiers are to be fitted with heatingarrangements.

Requirements to oil residue handling system ;


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Slide 22



Arrangements for transferring oilresidues and oily bilge water toreception facilities are to beprovided.

The reception facility

connection flange(s) shall besuitably located and withdimensions as given

Description Dimension

Outside diameter 215mm

Inner diameter According to pipe outside diameter

Bolt circle diameter 183mm

Slots in flange

6 holes 22mm in diameter equidistantly

placed on a bolt circle of the above

diameter, slotted to the flange periphery.

The slot width to be 22mm

Flange thickness 20mm

Bolts and nuts: quantity,

diameter

6, each of 20mm in diameter and of

suitable length

The flange is designed to accept pipes up to a maximum internaldiameter of 125mm and shall be of steel or other equivalent material

having a flat face.

This flange, together with a gasket of oilproof material, shall be

suitable for a service pressure of 6 bar.


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Slide 23


The reception facility connection flange(s)

oil residues and

oily bilge water

sewage


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Slide 24


The oil residue handling system shall have no direct

over board connection

The oil residue handling system shall have no connections to the bilge

water system, except for :

1. A possible common line leading to a commonreception facility connection flange.


2. Connections for draining settled water from sludgetanks to bilge water holding tanks or bilge wells

Fitted self-closing valves or equivalent arrangement.

Other than the reception facility connection flange

provided


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Slide 25

Bilge Water Separator


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Slide 26


Small oil droplets collect at the lower edgeof the profiles and coalesce into largerdroplets. These droplets flow upward andonward into the oil dome, where oil iscollected and drained into the waste oil the

waste oil tank.

Coalescing effects in the microfibre bed,Patented microfibre elements consist ofvarious layers of different types ofmicrometre thin fibres of a specialoleophilic material.


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Slide 27


Reference : www.alfalaval.com

FLOW DIAGRAM


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Slide 28


Where the bilge separator pump is arranged for automatic start

The oil content detecting device must initiate automatic stop of

overboard discharge when the oil content exceeds 15ppm.



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Slide 29

Bilge System & Oil Pollution Prevention

References ;

DNV Rules for Ships Pt.4 Ch.6 Sec.4

SOLAS 1974 as amended Ch.II-1 Part B Reg. 21

International Convention on Load Lines 1966

MARPOL 73/78 as amended Annex I

IMO resolution MEPC 107 (49)

IMO resolution MEPC 141 (54)

MEPC.1/Circ.641 & MEPC.1/Circ.642


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Slide 30

Case 6 : Please calculate the required capacity for the oil

residue/sludge tank(s) given that ;


1. HFO is purified for M/E use.

2. The vessel will have no restricted service notation.

3.The vessel is fitted with sludge incinerator.

4. Daily M/E fuel consumption is 200m.


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03. bilge system_2009_rev1 [compatibility mode].pdf

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