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 TM 55-1905-220-14-1
1-72. FRESH WATER SYSTEM PIPING.
a. The Fresh Water System (Figure FO-21) consists of a fresh water storage tank, pressure system, and an electric
water heater. A 3/4 inch hose valve for fresh water service is located on the inboard side of the deckhouse at Frame 46.
b. The Fresh Water Tank is located below decks on the centerline between Frames 40 and 44. Water from the tank is
piped by the pressure system to the shower, lavatory, sink, clothes washer, drinking fountain, water heater and to the
fresh water hose connections in the engine room. The tank is filled through a fill pipe and hose connection provided
above the vehicle deck on the outboard port side at Frame 44-1/2. Fill hose stowage is located at Frame 40 inboard port
bulwark. A tank vent is provided in the vehicle deck inside the deckhouse at Frame 41-1/2. The fresh water tank has a
capacity of 4166.6 gallons(15766.4 1)
c. The Tank Suction Valve is provided in the bottom of the tank. It is located just forward of Frame 44, 2 feet (0.61 m)
to port of centerline. A wye strainer is also installed in this line. The height of water in the tank can be determined by
reading the tank level indicating gage in the engine access room. It can also be determined by opening the petcocks that
are located at various heights on the aft side of the tank. A 1-inch suction pipe has been extended from the suction valve
on the bottom of the tank, aft and outboard to port under the floor plates to the pressure system.
d. The Pressure System consists of an electrically driven pump unit, a pressure tank with sight gage, a pressure switch
for automatic control of the system, automatic air volume control, hand air charging pump, and a Naval 50 gallon electric
water heater. The pressure system is located below decks at Frame 49. Drains and relief valves are provided on the
pressure system and hot water tank. A temperature gage is also provided for the hot water tank. The pressure system
has a designed pressure of 45 psi (3163.8 gm sq cm). The relief valve setting on the pressure tank is 50 psi (3515.4 gm
sq cm). The relief valve on the hot water tank is set for 55 psi (3866.9 gm sq cm).
Change 3 1-111
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