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Cylinder liner cloverleafing

Despite the close control of the cylinder surface temperature, acids are still formed which must be neutralised by the cylinder lubricating oil, this requires that the correct quantity and Total base number(TBN) grade of oil is injected into cylinder. Immediately the oil enters the cylinder it will start neutralising the acid, becoming less alkalinity may be depleted before it has completely covered the liner surface, further contact with acids may leads to the oil itself becoming acidic, this will leads to phenomenon known as cloverleafing in which high corrosive wear occurs on the liner between the oil injection points severe cloverleafing can result in gas blow by past the piston rings and ultimate failure of the liners, Source: reed's motor engineering knowledge, 78

Main Engine Auto slow down reasons

Main Engine (Auto Slowdown) Oil mist high density Scavenge air box fire Main L.O low pressure Cylinder cooling F.W low pressure Cylinder L.O non-flow Cylinder cooling F.W high temperature Piston cooling oil high temperature Stern tube bearing high temperature Thrust bearing segment high temperature Exhaust gas outlet high temperature/high deviation Exhaust Gas Economizer high temperature Exhaust Gas Economizer water non-flow

VALVES USED ONBOARD TANKER SHIP

Valves: Manifold valves Tank valves Drop valves Crossover valves Where its fitted Manifold Valves: These valves which are constructed in lines flow to the connecting flanges. Master valves: At each line where a fore and aft pipe lines passes through a tank sich hand operated valve is fitted in the line, these are known as master valves. Tank valves: The Valve which is close to each bell mouth is located as valve which controls the flow of oil into and out of the tank. Drop valves: Each main line has one or two drop lines and drop valves control the flow of oil in those line. Crossover valves: Athwart ship tank line joining the line are known as a crossover lines and the crossover valves separating the main line from other as well as separating individual tanks.

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