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 TM 55-1905-219-14-1
FIRE SYSTEM PIPING.
a. The Fire Pump (Figure FO-24) 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 gpm (359.6
lpm).
b. The Fire Pump is supplied by the sea chest valve at Starboard side or by the cross connection with the ballast
system. The pump takes suction through a single 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 bleed
line overboard must be open before starting pump. A check valve is installed in the fire pump discharge line to prevent
back flow. Shutoff valves are also provided for the fire stations.
BILGE SYSTEM PIPING.
The Bilge System Piping (Figure FO-25) 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 removed from
the bilge is 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 at 90 psig
(6327.6 gm sq cm) from the Fire Pump to operate.
BALLAST SYSTEM PIPING.
The Ballast System (Figure FO-26) 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-i. The portable fire pump may be used to drain the
peak ballast tank.
1-110 Change 3
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