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 TM 55-1925-273-10-1
OPERATOR'S MANUAL
INLAND AND COASTAL LARGE TUG (LT)
THEORY OF OPERATION
LUBRICATING AND HYDRAULIC OIL FILL AND TRANSFER SYSTEM
GENERAL
The lubricating oil fill and transfer piping system (figure 1) supplies clean lubricating oil to fill and replenish the main
propulsion engines, the Ship's Service Diesel Generators (SSDGs), the pump drive engine and the bow thruster engine.
Major components of the system include the following: a lube oil purifier (figure 1, item 1), a main engine lube oil transfer
manifold (figure 1, item 2), a lube oil transfer manifold (figure 1, item 3), a lube oil transfer pump (figure 1, item 4), a lube
oil storage tank, an oily waste drain tank (figure 1, item 5), an oily waste storage tank (figure 1, item 6), and a hand pump.
LUBE OIL PURIFIER
The lube oil purifier (figure 1, item 1) separates water from oil and simultaneously removes solids suspended in the oil.
Clean oil is returned to the engine sump. Lube oil purifier waste products (water and solids) are pumped to the oily waste
drain tank (figure 1, item 5).
MAIN ENGINE LUBE OIL TRANSFER MANIFOLD
The main engine lube oil transfer manifold (figure 1, item 2) is a duplex manifold used to control the flow of lube oil to and
from the main engines. Valves are interlocked, so lube oil can only be drawn from one main engine and returned to the same
main engine.
LUBE OIL TRANSFER MANIFOLD (3-WAY MANIFOLD)
The lube oil transfer manifold (3-way manifold) (figure 1, item 3) is a simplex manifold used to control the flow of lube oil
to the SSDGs, the main engine lube oil transfer manifold (figure 1, item 2), the bow thruster engine (figure 1, item 7), and the
pump drive engine (figure 1, item 8).
LUBE OIL TRANSFER PUMP
The rotary vane type lube oil transfer pump (figure 1, item 4) has a rated output of 15 gal/min (68.2 l/minute) at 25 PSI (1.7 bar).
The lube oil transfer pump is driven by a 1 hp electric motor. Power is supplied from the main switchboard, through 440V
power panel No. 1, to the motor controller.
OILY WASTE DRAIN TANK
The oily waste drain tank (figure 1, item 5) receives and holds the waste discharge from the lube oil purifier (figure 1, item 1) and
engine sumps. Oily waste is transferred via the oily bilge piping system to the oily waste storage tank (figure 1, item 6).
OILY WASTE STORAGE TANK
The oily waste storage tank (figure 1, item 6) provides a holding tank that supplies oily water to be processed by the oil water
separator. The tank also receives the oil output from the oil water separator. When appropriate, the oily waste discharge
pump can empty the oily waste storage tank through the shore connection.
LUBE OIL HAND PUMP
A lube oil hand pump (figure 1, item 9) is provided to drain the port and starboard reduction gear sumps.
0023 00-1
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