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 TM 55-1905-219-14-1
FUEL SYSTEM.
a. The Fuel System (Figure FO-20) supplies diesel fuel oil from the two storage tanks to the Main Propulsion
Engines, Anchor Winch Engine and Diesel Generator Engines. A Fuel Oil-Water Separator located between the fuel
tanks will remove water from the diesel oil before it enters the supply line. The supply line is fitted with a valve, strainer
and filter on each engine. Fuel return lines are fitted with check valves and lead from each engine to the storage tanks.
b. Valves are installed in the supply and return headers to return fuel to the tank. Suction is taken from the tank.
These valves and the common control are located below the Forward Engine Room floor plate level, port, 6 inches (15.24
cm) off the ship's centerline.
c. Before fuel reaches the valve in the return header, it may be fed through a heat exchanger to cool the fuel
(Figure FO-20). It may also be passed around the heat exchanger depending on the setting of three (3) valves. One
valve is located in the bypass. The other two are located near the heat exchanger fuel input and discharge points, which
are located port of centerline, under the floor plate. Cooling water is pumped by the diesel oil cooler sea water pump,
from the fire sea chest through the heat exchanger. Then it is discharged on the port side. The pump is located about 2
feet (0.61 m) starboard of the centerline.
d. Shutoff valves are fitted at each tank suction. They are fitted with reach rods carried to deck boxes in the
Engine Access Room, Starboard, 10 feet (3.05 m) of centerline. The wrench operating these valves is stowed against the
Deckhouse bulkhead. These valves can also be operated from the Forward Engine Room.
e. Fills on each tank are carried to the main deck outboard of the port bulwark. The two (2) valves are attached
to a common filling hose coupling of 2-1/2 inch size. Fill pipes are carried down to one foot (0.31 m) above the tank
bottom.
f. Each fuel tank is provided with a vent. It is carried up to an inverted, screened vent check valve located
outboard of the bulwarks. The port tank is vented port, and the starboard tank is vented starboard. Tank level indicating
gauges for the fuel tanks are located in the Engine Access Room. Each fuel tank is also fitted with a sound pipe opening
onto the main deck inboard of the bulwarks. The opening for the port tank is port and the opening for the starboard tank is
starboard. Sounding tapes are stowed in the Aft Engine Room tool locker.
Change 3 1-105
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