buildup when sizing the day tank. If a fuel oil
cooler is not used or if fuel is returned to the day
tank, 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 [a separate self-supporting] [integral]
day tank. Each day tank shall be provided with connections for fuel supply
line, [fuel return line, fuel overflow line, local fuel fill port, gauge,
vent line, drain line, and float switch assembly for control. A fuel
return line cooler shall be provided as recommended by the manufacturer and
assembler. The temperature of the fuel returning to the day tank shall be
below the flash point of the fuel. A temperature sensing device shall be
installed in the fuel supply line], [fuel overflow line, local fuel fill
port, gauge, vent line, drain line, and float switch assembly for control].
Each engine-generator set provided with weatherproof enclosures shall
have its day tank mounted within the enclosure. The fuel fill line shall
be accessible without opening the enclosure.
2.3.5.1
Capacity, Prime
Each day tank shall have capacity [as shown] [to supply fuel to
the engine
for an uninterrupted [8-hour] [_____] period at 100% rated load
without
being refilled, plus any fuel which may be returned to the main
fuel
storage tank. The calculation of the capacity of each day tank
shall
incorporate the requirement to stop the supply of fuel into the
day tank at
a "High" level mark of 90% of the ultimate volume of the tank].
2.3.5.2
Capacity, Standby
Each day 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, plus any fuel which may be returned to the main
fuel
storage tank. The calculation of the capacity of each day tank
shall
incorporate the requirement to stop the supply of fuel into the
day tank at
90% of the ultimate volume of the tank].
2.3.5.3
Drain Line
Each day tank drain line shall be accessible and equipped with a shutoff
valve. Self-supporting day tanks shall be arranged to allow drainage into
a 305 mm 12 inch tall bucket.
2.3.5.4
Local Fuel Fill
Each local fuel fill port on the day tank shall be provided with a screw-on
cap.
2.3.5.5
Fuel Level Controls
a.
Each day tank shall have a float-switch assembly to perform the
following functions:
(1) [When the main storage tank is located higher than the day
tank, open the solenoid valve located on the fuel supply line
entering the day tank and start the supply of fuel into the day
tank] [Start the supply of fuel into the day tank] when the fuel
level is at the "Low" level mark, 75% of the rated tank capacity.
SECTION 16263A
Page 40
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