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 TM 55-1905-242-14
0011 00
WATER CLOSET
A water closet assembly, located in the water closet compartment, is used to discharge human waste to the black water tank.
The water closet assembly has a self-priming flush pump to draw flushing water into the unit and a discharge macerator
pump to chop waste and pump it to the holding tank. The unit is powered by the vessel's 24 Vdc electrical system through
the control and distribution panel in the pilothouse. A pushbutton flush switch, mounted on the aft bulkhead of the water
closet, controls flushing.
SHUTOFF VALVE
A shutoff valve is installed in the water closet flushing water intake piping. This valve permits the flushing water to be
secured for service. The valve is located adjacent to the water closet.
STRAINER
A raw water strainer is located in the water closet flushing water intake piping. This strainer prevents particulate contami-
nants from entering and damaging the water closet's flushing water pump. Because this is a simplex strainer, the water closet
and the sea chest shutoff valve must be secured prior to servicing the filter.
TRAP
The galley sink and the water closet basin have traps installed in their drain piping. These traps prevent sewage gases from
exiting the black water tank through the drain piping.
CHECK VALVE
The galley sink and the water closet basin have check valves installed in their drain piping. These check valves prevent
black water and sewage from exiting the black water tank through the drain piping, no matter what the vessel's trim angle.
DISCHARGE PUMP
A discharge pump, mounted beneath the galley sink, is provided to discharge the black water tank's contents to an appropri-
ate receiving facility. The pump is powered by the vessel's 24 Vdc electrical system through the control and distribution
panel in the pilothouse.
L PORT VALVE
Two L port diverter valves are used to allow the operator to select the method of emptying the black water tank. By properly
aligning the valves, the black water tank may be emptied by the discharge pump or by an appropriate discharge facility's
pump.
DISCHARGE FITTING
A flush mounted discharge fitting is provided on the starboard walkway, aft of frame 25. This fitting is used to allow
connection of a discharge line from an appropriate discharge facility.
VENT
An inverted check valve vent fitting is installed on the starboard walkway, aft of frame 25. This fitting vents the black water
tank as the tank level changes. The inverted vent opening is fitted with a screen to prevent contaminants from entering the
system.
VENT FILTER
A vent filter is installed in the vent piping between the black water tank and the inverted check valve vent. The filter is located
near the galley sink. The filter prevents odors from exiting the black water tank.
0011 00-2
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