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 TM 55-1905-220-14-1
1-69. FUEL SYSTEM.
a. The Fuel System (Figure FO-19) supplies diesel fuel from the two storage tanks to the main propulsion engines,
anchor winch engine, and diesel generator engines. The supply line is fitted with a fuel filter/water separator to remove
water from the diesel fuel. Each engine is equipped with a fuel strainer, shutoff valve, and filter. Fuel return lines are
fitted with check valves, and lead from each engine to the fuel storage tanks.
b. Valves are installed in the supply and return headers to return fuel to the tank. Suction is being 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. 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 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) off the 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 2-12 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 at deck level. The port tank is vented to port, and the starboard tank is vented to starboard. The vents
are provided with fuel catchments to prevent fuel oil spillage overboard. Catchments are piped to allow overflow of fuel
to drain into the bilge. Tank level indicating gages for the fuel tanks are located in the Engine Access Room. Each fuel
tanks is also fitted with a sound pipe opening onto the main deck inboard of the bulwarks. The opening for the port tank
is to port and the opening for the starboard tank is to starboard. Sounding tapes are stowed in the Aft Engine Room tool
locker.
g. Each fuel tank is also provided with an 18 inch diameter drainwell and drain valve. Drain valves are located below
engine room deck level on port and starboard fuel tanks. Drain valves are provided with a padlock and chains to secure
in a closed position.
h. An isolation valve is provided in the Forward Engine Room, port, to shut off the fuel suction line to the Aft Engine
Room and the anchor winch diesel engines.
Change 3
1-109
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