Lubricating System of Ships

Lubricating System of Ships

USE OF LUBRICATION OIL

1. To reduce friction and wear – keep metal surface clean by carrying away possible deposits.

2. To providing a seal to keep out dirt

3. Carrying heat generated away in bearing and gear etc – to prevent overheating, seizure and breakdown

4. By added a proper amount of additives    (chemical compound) on it – improved protection to machineries and life of oil itself.

LUBRICATION OIL are classified by:

     1. Viscosity -> temperature dependent

     2. Severity of operating conditions - > sulfur,

     carbon, fluctuating load, frequent starts and stop.

Most common LUBRICATION OIL is given by SAE numbers

       ·      SAE 30 or 40 – medium and high speed

engines.

       ·      SAE 5W OR 10W – small boat, cold weather.

LUBRICATION OIL Additive

  ·       Anti-oxidant – reduces oxidation rate – sludge when hot.

·      Corrosion inhibitor – alkaline additive – neutralize acidity.

·       Detergents – Keep metal surface clean.

·       Dispersants – prevent small particles forming large one.

·       Anti-foaming – prevent foaming – jam.

·       Viscosity index improver – maintain viscosity as near constant in variable temperature.

      ·       System start journey from bottom of crankcase sump or drain tank -> pump -> strainer ->cooler -> engine

and distributed to engine parts .

·      Branch pipe inside engine feed:

ü -main bearing – drilled passage in crankshaft to the bottom end bearing – then up a drilled passage in the connecting rod to the gudgeon pin or cross head bearing.

ü  After use , oil flow back to the sump or drain tank for reuse.

System auxiliary LUBRICATION OIL

 ·      Alarm- ensure that adequate pressure is maintained by the pump.

·      Pump and pipe filters are duplicated for standby purpose.

·      gauge level- local reading out.

·      Centrifuge – cleaning.

·      Oil cooler- by low pressure sea water supply at lower pressure – at leakage there is loss of oil and no mixing of oil and water.

·      Cylinder lubrication- provided for large slow speed diesel engine for cylinder liner and piston.

LUBRICATION OIL Transportation

·      Sump (storage) -> strainer -> pumps ->filters-> cooler -> engine distribution).

·      Distribution – main bearing -> drilled passage in crankshaft -> bottom end bearing->up drilling passage to the connecting rod- >gudgeon pin or cross head bearing.

·      After use the LUBRICATION OIL drain back to the tank for Reuse .