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FUEL TANKS AND FUEL LINES
Fuel tanks and fuel lines must be installed in
accordance with requirements of NFPA 31.
If fuel lines are under 30 feet in length, it is satisfactory
to use 3/8" O.D. copper tube. Never use tube smaller
than 3/8" O.D. If the lines are over 30 feet in length, we
recommend 1/2" O.D. tube. Use good flare
connections on the fuel lines and, whenever possible,
avoid splicing the tube. Never make a splice or joint
underground. Whenever possible, avoid overhead
lines; avoid kinks and traps in the lines. Do not fasten
fuel lines directly
to floor joists, sills, or girders. Whenever possible,
support fuel lines with sound-absorbing devices.
SINGLE LINE SYSTEM
When fuel does not have to be lifted from tank to
burner use a single line hookup. A single line system
can be used when outlet on fuel tank is higher than
inlet on burner.
TWO LINE SYSTEM
To lift fuel from tank to burner use a two-line system.
On outside buried tanks, install a supply line from tank
to burner and return line from burner back to tank. The
supply line is called the suction line. The suction line
should extend down within a few inches of the bottom
of fuel tank.
OIL FILTER
A fuel filter should be used with either an outside or
inside fuel tank. In all cases install the filter in
accordance with local codes. The filter should always
be installed inside, near the furnace. An inside tank and
any internal or external fire or flame appliance being
served by the tank must be at least 5 feet away from
the furnace. New oil replacement cartridges should be
installed annually or as required. Always use the new
gasket that is supplied with the replacement cartridge.
Tighten the top of the filter carefully and check the
gasket for proper fit.
FILL AND VENT PIPES
Fuel tanks must be equipped with a fill pipe and a vent
pipe. Fill pipes should be terminated in a convenient place
for filling. They should be equipped with a watertight cap.
It is recommended that 1-1/4" pipe be used for the vent.
The vent should extend outdoors served by the tank and
FIG. 18
Installation
FUEL LINE