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 TM 55-1905-220-14-1
1-75. FIRE SYSTEM PIPING.
a. The Fire Pump (Figure FO-23) supplies sea water to the fire stations, magazine sprinkler system, and the
washdown countermeasure system. It is also used to fill and empty the ballast tanks. During an emergency, the Fire
Pump will supply motive water to the bilge eductor to drain the bilge if the bilge pump is not working. Discharge lines are
sized for a minimum pressure of 85 psi (5976.1 gm sq cm) at the highest fire plug strainer at a flow rate of 95 gm (359.6
1pm).
b. The Fire Pump is supplied by the sea chest valve starboard side or by the cross connection with the ballast system.
The pump takes suction through a duplex basket strainer. The fire pump discharges into the firemain, the overboard
discharge, the pump bleedline overboard, the eductor actuating supply, or the ballast filling line. Valves for all these
services are located near the vessel's centerline at the aft bulkhead of the aft engine room. The fire pump bleedline
overboard must be open before starting the pump. A check valve is installed in the fire pump discharge line to prevent
back flow. Shutoff valves are also provide for the fire stations.
1-76. BILGE SYSTEM PIPING.
The Bilge System (Figure FO-24) consists of the bilge pump, box strainers, valves and piping serving the main
machinery spaces. The bilge pump is driven by a belt drive on the port propulsion engine. All water is removed from the
bilge and fed into the oil/water separator system. Hose valves are installed in each engine room at Frames 50 and 56.
They are used with suction hoses to remove pockets of water from the bilges. In an emergency, when the port
propulsion engine must be shut down, the bilge can be drained using the bilge eductor. The eductor requires motive
water as 90 psig (6327.6 gm sq cm) from the fire pump to operate.
1-77. BALLAST SYSTEM PIPING.
a. The Ballast System (Figure FO-25) consists of piping and valves serving the aft ballast tank, the forward port and
starboard ballast tanks, and the peak ballast tank. When the ballast tanks are being filled, the same piping system is
used with sea water flowing in the opposite direction. Tank level indicators for the ballast tanks are located on the aft
bulkhead, in the aft engine room, beside the fire pump controller. The forward port and starboard ballast tanks and peak
ballast tank valves can be operated remotely by the handwheels located in the crew berthing at Frame 33. Additionally,
the peak ballast tank can be filled with a hose from the deck plug at Frame 11-1/2. The portable fire pump may be used
to drain the peak ballast tank.
Change 3 1-114
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