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 TM 55-1905-220-14-1
1-74. SEWAGE SYSTEM PIPING.
a. The Sewage System (Figure FO-22) consists of one urinal, two water closets, one holding tank, port and starboard
deck connections with valves for the sewage discharge hose, an overboard discharge with gagged scupper, two three-
way two-port valves, a discharge pump, two vacuum pumps, and piping and fittings. The urinal and water closets are
located in the wash and shower rooms in the deckhouse. They are flushed by salt water from the salt water flushing
system.
b. The Holding Tank is located at Frame 47 between the two diesel oil tanks. The tank has connections for sewage-in,
sewage discharge, a vent, and flushing by water from the firemain. The tank includes two one-horsepower vacuum
pumps, one five-horsepower sewage discharge pump, and a controller for the pumps. The controller and pumps are
located beside the tank. The sewage discharge pump is located at port end of holding tank.
c. Located at Frame 43-1/2, starboard, between the deckhouse and the bulwark is a vent with a ball check valve for
the holding tank and a capped 4-inch connection for the sewage discharge hose. A valve is also provided at this hose
connection point. A similar connection for the sewage discharge hose is provided at Frame 42 on the port side outside
the bulwark.
d. A three-way plug valve is provided in the discharge pipe from the sewage pump. It is located just forward of the
port diesel oil tank, about 14 inches (35.6 cm) below the vehicle deck and 5 feet (1.5 cm) to port of centerline. The valve
allows the sewage discharge pipe to be closed, or to opened to the port or starboard discharge point. There is another
plug valve at Fram 45-1/2, port. This valve allows the port discharge to be directed to the overboard discharge or the
port discharge point.
e. A tank flushing valve is located in the flushing line from the firemain to the holding tank at Fram 48, above the port
end of the holding tank.
f. The Shipboard Collection Disposal System consists of four main assemblies; water closets, urinal, discharge valve,
and collection tank, and piping which uses vacuum or differential pressure to move the flushed 'black-water' to the
collection tank. A control panel located on the collection tank assembly provides for semi-automatic operation of the
collection system.
g. Vacuum pumps empty the collection tank and influent lines to the water closets and urinal discharge valve. When
the water closet valve is started and opened, the sewage is pushed through the influent line or piping to the collection
tank. A liquid level, time delay sensor in the pump controller box controls the level indicator lights. Hand operated
valves are located throughout the system to direct flow for various methods of operation. They also are used to isolate
components requiring servicing or maintenance. In an emergency, the tank can be emptied by air pressure applied at
the tank top.
Change 3 1-113
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