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 TM 55-1905-223-10
e. Hot Water Heate. The hot water heater heats the CFW supply and maintains its setpoint
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temperature. Power for the hot water heat is supplied from the main switchboard 240 Vac distribution panel
and controlled by a disconnect switch adjacent to the heater. Hot fresh water (HFW) from the heater is
supplied to the booster pump.
f. Booster Pump The booster pump maintains HFW pressure required for the Gaylord Hood system.
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g. Booster Heaters Two booster heaters provide an increase in HFW temperature for use in the galley
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(dishwasher and hood). Both booster heaters are supplied with power from the GALLEY POWER PANEL
P202.
h. Tank Level Indicator Transmitters Each FW tank contains a tank level indicator transmitter which
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sends a tank level signal to the gauge board in the engine room which indicates each FW tank level.
1-32. Bilge/Ballast and Firemain Piping System The bilge/ballast and firemain piping systems remove
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accumulated water from the bilges, transfers seawater to and from seawater ballast tanks, and supplies
seawater to the firemain, countermeasure washdown (CMWD), and AFFF foam proportioners.
a. Bilge/Ballast Piping System The bilge/ballast piping system (FIGURE 1-40) draws bilge water from
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selected ship bilges and discharges it overboard. The system also draws seawater from the sea chest and
distributes it to selected ballast (seawater) tanks and draws seawater from the ballast tanks and discharges it
overboard, or to another ballast tank. In an extreme emergency, the bilge/ballast piping system can be aligned
to supply ballast water to the fire main. System control is maintained through a combination of valves as
shown in FIGURE 1-40. The system consists of the bilge/ballast pump, bilge manifold, and ballast manifold.
Power for the bilge/ballast pump is supplied from the main switchboard 240 Vac distribution panel and
controlled by start and stop pushbuttons on the engine room console.
b. Fire Main and Foam Piping System The fire main and foam piping system (FIGURE 1-41) draws
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seawater from the sea chest to pressurize the fire main, countermeasure washdown (CMWD), and AFFF foam
proportioners. System control is maintained through a combination of valves as shown in FIGURE 1-41. The
system consists of fire pumps No. 1 and No. 2, and auxiliary fire pump. The fire main supplies seawater to
fire stations, the countermeasure washdown station, and the AFFF foam proportioners. Power to fire pumps
No. 1 and No. 2 is supplied by the main switchboard 240 Vac distribution panel. Control of the pumps is
provided from start and stop pushbuttons adjacent to the pumps or from stop and start pushbuttons on the
engine room console. The auxiliary fire pump will also pressurize the fire main. This pump is powered by the
bowthruster/auxiliary fire pump diesel engine.
1-117
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