2.3.4.2
Local Fuel Fill
Each local fuel fill port on the day tank shall be provided with a screw-on
cap.
2.3.4.3
Fuel Level Controls
a.
Each tank shall have a float-switch assembly to perform the
following functions:
(1)
Activate the "Low Fuel Level" alarm at 70% of the rated tank
capacity.
(2) Activate the "Overfill Fuel Level" alarm at 95% of the rated
tank capacity.
2.3.4.4
Arrangement
Integral tanks may allow gravity flow into the engine. Gravity flow tanks
and any tank that allows a fuel level above the fuel injectors shall be
provided with an internal or external factory installed valve located as
near as possible to the shell of the tank. The valve shall close when the
engine is not operating. Integral day tanks shall be provided with any
necessary pumps to supply fuel to the engine as recommended by the
generator set manufacturer. The fuel supply line from the tank to the
manufacturer's standard engine connection shall be welded pipe.
2.3.5
Day Tank
**************************************************************************
NOTE: Delete this paragraph if an integral main
fuel storage tank is used.
See NFPA 99 and NFPA 110 for guidance on fuel tank
sizes.
See NFPA 37 restrictions on allowable day tank sizes
and enclosures. Select either self-supporting or
integral day tank. Select the first option below
for applications where fuel is returned to the day
tank. Select the second option below for
applications where fuel is returned to the main
tank. Integral day tanks allow for 1 to 8 hours of
operation. Consult generator set manufacturer for
the proper hours of operation for the application of
integral day tanks. Standby applications for use
with fire pumps will have day tanks sized for 8
hours duration. Select day tank capacity for either
prime or standby application. The day tank can be
sized by the designer or the Contractor. The size
of the day 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. The excess fuel
may be returned to the day tank or main fuel tank.
The designer should also consider the impact of heat
SECTION 16263A
Page 39
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