3/16 inch steel plate with welded joints and necessary stiffeners on
exterior of tank. Provide a braced structural steel framework support.
Weld tank top tight and provide an access opening with dustproof,
removable 600 mm 24 inch cover. Provide 114 mm 4 1/2 inch square
inspection port. Provide proper venting of both inner and outer
containment.
b.
Float Switches: Provide tank-top mounted or external float cage,
single-pole, single-throw type designed for use on fuel oil tanks.
Arrange high level float switches to close on rise of liquid level, and
low level float switches to close on fall of liquid level. Mount float
cage units with isolating and drain valves. Contacts shall be suitable
for the station battery voltage.
1.
Critical low level float switch which shall activate at 5 percent
of normal liquid level shall shut engine off.
2.
Low-low level float switch which shall activate alarm at 30
percent of normal liquid level.
3.
Low level float switch which shall open the fuel oil solenoid
valve and start the[ remote] fuel transfer pump at 75 percent of
normal liquid level.
4.
High level float switch which shall close the fuel oil solenoid
valve and stop the[ remote] fuel transfer pump at 90 percent of
normal liquid level.
5.
Critical high level float switch which shall activate alarm at 95
percent of normal liquid level.
c.
Leak Detector Switch: Actuates when fuel is detected in containment
basin, stops fuel transfer pump, and closes the fuel oil solenoid valve.
d.
Control Panel: Provide NEMA ICS 6, Type[ 1][ _____], enclosed control
panel for each day tank. Control panel shall include the following
accessories.
1.
Power available LED (green).
2.
Critical low fuel alarm contacts for shut down of engine.
3.
Low-low level fuel alarm LED.
4.
Low-low level fuel alarm contacts for remote annunciator.
5.
Critical high level fuel alarm LED.
6.
Leak detecting alarm LED.
7.
Alarm horn.
e.
Tank Gages: Provide buoyant force type gages for diesel fuel day tanks
with dial indicator not less than 100 mm 4 inches in size and arranged
for top mounting. Calibrate each reading dial or scale for its
specific tank to read from empty to full, with intermediate points of
1/4, 1/2, and 3/4.
SECTION 16237N
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