An integral main fuel storage tank will be the only
fuel source for the engine. These tanks may be
useful for applications that require a minimal fuel
storage capacity.
Due to the minimal storage capacity, integral main
fuel storage tanks are not practical for prime power
usage. They are also not practical for standby units
that require large fuel quantities. The designer
should consider the availability and anticipated
frequency of fuel truck deliveries when deciding
whether or not to use an integral main fuel storage
tank. These tanks should also not be used in
locations where a truck fueling hose can not reach
the diesel generator set.
See NFPA 99 and NFPA 110 for guidance on fuel tank
sizes.
See NFPA 37 restrictions on allowable tank sizes and
enclosures. Integral tanks allow for 1 to 8 hours
of operation depending on diesel generator size and
configuration. Consult generator set manufacturer
for the proper hours of operation for the
application of integral tanks. Standby applications
for use with fire pumps will have tanks sized for 8
hours duration. The tank can be sized by the
designer or the Contractor. The size of the tank
should be based on a fuel flow rate that is equal to
the value of a typical engine manufacturer for the
indicated engine generator size. A value of 200% of
the expected fuel consumption of the engine is not
unusual for the flow rate of the main fuel pump.
Since the excess fuel will be returned to the tank,
the designer should consider the impact of heat
buildup when sizing the tank. If a fuel oil cooler
is not used, the day tank size may need to be
increased to properly dissipate the heat absorbed by
the fuel.
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Each engine shall be provided with an integral main fuel tank. Each tank
shall be factory installed and provided as an integral part of the diesel
generator manufacturer's product. Each tank shall be provided with
connections for fuel supply line, fuel return line, local fuel fill port,
gauge, vent line, and float switch assembly. A fuel return line cooler
shall be provided as recommended by the manufacturer and assembler. The
temperature of the fuel returning to the tank shall be below the flash
point of the fuel. Each engine-generator set provided with weatherproof
enclosures shall have its tank mounted within the enclosure. The fuel fill
line shall be accessible without opening the enclosure.
2.3.4.1
Capacity
Each tank shall have capacity [as shown] [to supply fuel to the engine for
an uninterrupted [4-hour][_____] period] at 100% rated load without being
refilled.
SECTION 16263A
Page 38
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