lubricating oil system

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© Adi Wirawan Husodo

2014

Course-8. General Shipboard System

Lubricating Oil System

Lecturer : Adi Wirawan Husodo, ST, MT

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Reference:

• Japan Marine Engineering Society, Machinery

Outfitting Design Manual, vol.1: Piping System for

Diesel Ships, 1982.

• Engine Project Guides.

• H.J. Cassee, Piping System, Marine Engineering,Chapter XX, SNAME

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What?

• Lubricating oil in the machinery system acts to

minimize friction on the surface of the moving

components.

• Lubricating oil also functions as a cooling fluid on

some motors.• Lubrication system is also used for cooling and

lubrication of the engine bearings, piston cooling, and

so on.

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Type

• Uni Lubricating Oil System

– System that lubricates the moving parts of the engine-part,

such as: crank shaft, main bearings, journal bearings, cam

shafts, pistons, connecting rods, exhaust valve actuator and

the other moving parts other than the cylinder .

• Cylinder Lubricating Oil System

– Specific lubrication system which lubricates the engine

cylinder using the principle of gravity

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Uni Lubricating Oil System

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Refer to:

MAN S26 MC




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• LO System

– Cooling, filtering, and supplying LO to M/E (bearings,

camshaft, exhaust valve actuator, piston)

– Sump tankLO pumpLO coolerfull-flow filterEngine

sump tank

• LO Purifying System

– Purifying LO for recirculation

– Sump tankfilterLO pumppre-heater purifier

sump tank or LO service tank

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LO system’s Components

• LO bottom tank (sump tank)

– Location: below m/e;

– Volume: ref to project guide, f(no. of cylinder);

– Drain location: engine;

–

Cofferdams must be provided surroundings;• LO pipes

– Schedule : 40 or 80 (3rd or 2nd class);

– Diam: according to Q (project guide) and V (typically 1.5 m/s

1.8 m/s);

–

No passing through: ballast, FW, and feed water tanks; – Usually galvanized (recommended);

– Minimum pipe thickness should refer to Class.

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• LO PUMP – To circulate the LO from Bottom Tank (Sump Tank) to engine

and back again to Bottom Tank (Sump Tank);

– Type : screw atau gear pump with sufficient Q and Pressure ;

– Location: tank top (closest possible to LO tank);

– Q = Ref to project guide (depends on BHP); – Vflow = refer to engine Project Guide (typically max 1.8 m/s);

– Head total = ΔHz + ΔHp + total Head loss;

– Hz = elevation of (tank – inlet on engine);

– Hp = delivery pressure (ref to Project Guide , typically 4 bar)

– H loss tot = H friction + H loss accessories;

– Accessories include fittings, valves, filter (HL typically 0.5bar), cooler (typically 0.3 bar).

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• Lubricating oil cooler

– Is used to cool the LO which exit from the engine.

– Cooling media : SW

– Type: shell and tube or heat plate exchanger

•Separator or Purifier – Is used to purify the LO due to contamination of water

content or sludge which is coming from engine.

• Lubricating oil temperature control valve

– 3-way valve;

–

To by-pass partially or fully LO cooler.

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l.o. pumpl.o. separator




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l.o. cooler attached on sideplate




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l.o. service tank (onplatform)




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Cylinder Lubricating Oil System

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Thank You

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lubricating oil system

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