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 TM 55-1925-273-10-1
OPERATOR'S MANUAL
INLAND AND COASTAL LARGE TUG (LT)
THEORY OF OPERATION
BILGE AND BALLAST SYSTEMS
GENERAL
The bilge system removes liquid from the vessel's bilges, preventing the Large Tug (LT) from flooding or causing flood
damage during rough sea conditions where bilge fluids could wash onto deck plates or onto vital equipment in the engine
room. An oily water system is also installed as a part of the bilge system. The oily water system pumps, stores, and treats
oily water from the engine room and AMS 1 bilges.
The ballast system maintains stability of the vessel by transferring raw water to and from the vessel's three ballast tanks.
THE BILGE SYSTEM
The bilge system consists of: eductors, bilge, and ballast pumps (figure 1, item 1), bilge manifold, and bilge piping.
EDUCTORS
Eductors are jet-type pumps that contain no moving parts. An eductor moves liquid from one place to another by entraining
the pumped liquid in a rapidly flowing stream of liquid utilizing the venturi effect.
BILGE AND BALLAST PUMPS
The bilge and ballast pumps (figure 1, item 1) are horizontally mounted, self-priming, centrifugal pumps, each with a rated
output of 100 gal/min (379 L/minute) at 50 PSI (3.46 bar). The bilge and ballast pumps are driven by a 5 hp electric motor.
Electric power for bilge and ballast pump 1 is provided from the emergency switchboard. Electric power for bilge and
ballast pump 2 is provided from the main switchboard. Discharge from the pumps can be directed either overboard or to the
duplex ballast manifold (figure 1, item 2).
BILGE MANIFOLD
The bilge manifold (figure 1, item 3) provides selection and control of piping alignment. The bilge manifold is connected to
a simplex strainer (figure 1, item 4) on the suction side of the bilge and ballast pumps (figure 1, item 1).
BILGE PIPING
Six piping branches are provided from the bilge manifold (figure 1, item 3), two each to the engine room and AMS 1, and
one each to the shaft alley (PORT) and shaft alley (STARBOARD). Each piping branch is equipped with a check valve and
bellmouth at its end.
OILY WATER SYSTEM
The oily water system components consists of: an oily waste drain tank (figure 2, item 1), an oily waste storage tank (figure 2,
item 2), an oily waste discharge pump (figure 2, item 3), an Oil Water Separator (OWS) (figure 2, item 4), and an Oil Content
Monitor (OCM).
OILY WASTE DRAIN TANK
The oily waste drain tank (figure 2, item 1) receives and stores waste discharge from the lube oil purifier and engine sumps.
Oily waste is transferred to the oily waste storage tank (figure 2, item 2).
0029 00-1
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