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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
POTABLE WATER SYSTEM
GENERAL
The LCM-8 Mod 2 is provided with a potable water system that supplies potable water to the galley sink, the water closet
sink, and the windshield washdown system. A hot water heater is installed in the system to provide hot water to the galley
sink and the water closet sink. The system is composed of a potable water tank, pressure set, filter, faucets, water heater,
windshield washdown pump, deck fill, vent, and tank monitor system.
POTABLE WATER TANK
A 150 gallon (567.8 liter) stainless steel potable water tank is mounted in the watertight void between bulkheads 23 and 27.
The tank has fittings for connecting the deck fill and vent piping as well as pickup connections for the pressure set and the
windshield washdown pump. The tank is also fitted for the tank watch level indicator.
PRESSURE SET
A pressure set, located under the accommodation module entry ladder, provides pressurized potable water to the galley and
water closet compartment. The pressure set is powered by the vessel's 24 Vdc electric system through the control and
distribution panel in the pilothouse. The pressure set is a modular unit containing a pump, pressure switch, and accumulator.
Together these components deliver an even flow of pressurized water to the sinks. The pump is a positive displacement type
with a rubber impeller. The pressure switch is preset to turn the pump on at 8 lb/in (0.6 bar) and to turn it off at 24 lb/in
(1.7 bar). The accumulator helps to equalize the flow of water by absorbing pressure surges
FILTER
All potable water delivered to the galley and water closet compartment passes through a filter. The filter contains granulated
activated charcoal, which removes many organic and inorganic substances from treated water. The filter also contains
Kinetic Degredation Fluxion (KDF), which removes lead and prevents bacteria growth. A one-micron filtration element
removes most parasites which would cause stomach discomfort. The filter is designed for use with treated water only.
FAUCET
Two faucet assemblies are provided in the potable water system, one in the galley and one in the water closet compartment.
The faucets control the flow of both hot and cold potable water into the sinks.
WATER HEATER
A 10 gallon hot water heater is provided to supply hot water to the galley and to the water closet compartment. The hot water
heater has two heating elements. The first element is connected to the engine coolant system for the starboard propulsion
engine. This element uses the heat of the engine coolant to heat the potable water in the water heater. The second element
is an electric element, which uses electric power from the vessel's 220 Vac electrical system to heat the potable water. When
the starboard propulsion engine is operating, the hot water is heated primarily by the propulsion engine element.
WINDSHIELD WASHDOWN PUMP
A 2.5 gal/min (9.5 L/min) self-priming pump is installed to supply potable water to the windshield washdown system. This
water supply is drawn from a separate pickup in the potable water tank and is neither filtered nor heated. The pump is
powered by the vessel's 24 Vdc electrical system through the control and distribution panel in the pilothouse. The pump
contains an integral pressure switch, which turns the pump on at 10 lb/in (0.7 bar) and turns it off at 20 lb/in (1.4 bar). The
pump is controlled by a switch located on the pilothouse console.
0010 00-1
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