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 TM 55-1905-242-14
OPERATOR, UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE
FOR LANDING CRAFT, MECHANIZED (LCM-8) (ALL VESSELS WITH MOD 2 APPLICATION)
THEORY OF OPERATION
BLACK WATER SYSTEM
GENERAL
The black water system receives, stores, and discharges all black water and sewage generated aboard the LCM-8 Mod 2. No
overboard discharge is provided, nor is any treatment provided. The black water and sewage are stored in the black water
tank until the tank can be discharged to an appropriate treatment facility. The system is composed of a holding tank, water
closet, shutoff valve, strainer, traps, check valves, discharge pump, L port valves, discharge fitting, vent, vent filter, and tank
monitor system.
BLACK WATER TANK
A 190 gallon black water tank, located in the watertight void between frames 23 and 27, stores all black water and sewage
until it can be discharged to an appropriate treatment facility. The tank has inlet, outlet, and vent fittings as well as a flange
mounting for the tank level indicator float switch unit.
DISCHARGE
FITTING
DISCHARGE
PUMP
L PORT
VALVES
WASH
GALLEY
VENT
SHUTOFF
BASIN
SINK
VALVE
CHECK
VALVE
VENT
FILTER
WATER
CLOSET
TRAP
TRAP
SEA
CHEST
190 GAL
STRAINER
HOLDING TANK
BLACK WATER SYSTEM
0011 00-1
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