Lubricating Oil Transfer and Purification Piping System

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FIGURE 1-48. Compressed Air Piping System (Sheet 5 of 5).

TM-55-1905-223-10 Landing Craft Utility (LCU 200 Class) NSN 1905-01-154-1191 Manual

FIGURE 1-49. Lubricating Oil Transfer and Purification Piping System (Sheet 1 of 8).

TM 55-1905-223-10

1-40. Lubricating Oil Transfer and Purification Piping System. The lubricating oil transfer and purification

piping system supplies clean lubricating oil for proper operation of the main propulsion engines. The system

also transfers lubricating oil from the storage tank to the main engines and ships service diesel generator

engines sumps. The system also draws lubricating oil from the main engines sumps. Prelubricating the main

engines after an extended shutdown period is possible with use of the prelube pump. The system can be

aligned to transfer dirty lubricating oil from the main, SSDG, and bowthruster engines and reverse reduction

gearboxes to the dirty oil tank. System alignment is maintained by a combination of valves and hand pumps as

shown in FIGURE 1-49. Dirty oil and sludge are discharged from the system via the dirty oil pump to port or

starboard dirty oil discharge deck connections. Power for the lube oil purifier unit and heater, lube oil prelube

pump, and dirty oil pump is supplied by the auxiliary machinery motor control center Each has a START/STOP

pushbutton adjacent to the unit and run indicator lamps on the engine room operating station engine room

console panel. Containers for replenishing lubricating oil at the bowthruster engine, main reduction gears, and

emergency generator diesel engine, may be filled at the storage tank container fill valve.

1-41. Oily Water Separator Piping System. The oily water separator piping system consists of a three-

stage coalescer oil-water separator with pumps, motors and oil content alarm. The system separates and

removes nonsoluble oil, solids, and entrained air from the bilge water before it is discharged overboard.

System control is maintained through a combination of valves as shown in FIGURE 1-50. Power for the oil

water separator is supplied by the MISC MCHRY POWER PANEL P204. A running indicator is provided on the

engine room console panel.

1-42. Sewage Piping System. The sewage piping system collects and routes ship's sewage to the sewage

treatment device and then to a through-hull overboard discharge. The sewage treatment device uses natural

bacteria to decompose solids in the sewage. The decomposed sewage is then treated with chlorine prior to

overboard discharge. The sewage treatment device is supplied with power by the MISC MCHRY PANEL P204,

through a 240/120 Vac step-down transformer. Controls for the sewage treatment device are located on the

unit.

1-43. Propeller Shaft, Propeller, and Shaft Brake. The propeller shaft transfers power provided by the

main reduction gear and clutch to the propeller, which converts it to thrust required to move the vessel. The

shaft brake stops and holds the propeller shaft when no torque is applied. The shaft is connected to the main

reduction gear via the propeller shaft flange. The shaft is lubricated by water from the stern tube lubrication

piping system. The air actuated shaft brake stops the propeller shaft rotation when torque is removed from the

shaft. The brake is automatically actuated. Shaft locks allow manual locking of each shaft.

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