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8 Cards in this Set

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purpose of the Main LIO system
To provide oil for heat removal and lubrication to bearings and gears in the main engine and reduction gears.
Attached lube oil pump (ALOP)
- 430 gpm. Geared to the main reduction gear delivers enough oil to the main engine when the shaft is turning at 94 rpms or greater.
Standby lube oil pump (SLOP)
400 GPM. Turbine driven, delivers oil to the main engine when the shaft is turning less than 94 RPMs or stopped. Can be used as long as steam is available for the turbine.
Emergency lube oil pump (ELOP)
) 275 gpm. Motor driven, used when shaft speed is not fast enough for the alop, during light-off and securing, normally used as the standby for the slop
L/O cooler
Classified as a single pass, shell and tube heat exchanger. Uses seawater to remove heat from the lube oil that has left the bearings and gears. L/O cooler outlet temp is maintained between 120-130 degrees. (Outlet temp) Seawater pressure is 6-8 PSI; L/O pressure is 12-14 PSI so if a leak develops in a tube the oil will leak into the seawater and not the opposite. Periodic water samples are taken to check for oil.
L/O strainer
Made from a fine metal mesh screen, removes participate matter from oil. Duplex strainer has two baskets. While one is being used, the other can be cleaned and inspected. Magnets in the basket trap metal particles that can indicate problems in bearings or gears.
L/O purifier
Used to remove both water and sediment from lube oil.
We have one disk type, delaval purifier. Uses centrifugal force to remove sediment and water from the lube oil. When the main source of contamination is sediment, the purifier is said to be a clarifier. When the main source of contamination is water, the purifier is said to be a separator.
L/O storage and settling tanks
3 (A, B, C) 760 gallons capacity each. Used to store good, clean oil (2190TEP) that is ready for use in main and auxiliary equipment.
Settling - 2 (A, B) 788 gallon capacity each. Used to hold contaminated oil until it can be prepared to be purified. Normally done while in port, the oil is heated to help allow gravity to pull water and sediment to the bottom of the tank. The oil is then sent to the purifier to remove the rest of the
contaminants. Next, the oil can be pumped to sumps or to a storage tank.