(7)
Any additional devices as required by FM or NFPA
[(8)
Low fuel oil temperature]
e.
Safety system limits specified above shall be displayed on a first
out annunciator mounted in the burner panel. [Provide a common
alarm contact to be wired to the operator control console,
specified under VAMS Section 15901N CONTROLS AND INSTRUMENTATION
BOILER PLANT.]
2.5.2.3
Light Off
Failure shall require a manual restart of the programmer. The safety
system shall provide a mandatory purge with the forced draft fan vanes
proven open, and a return to proven low fire position before light off.
Main fuel valve shall open for a timed period of 10 seconds during trial
for ignition.
2.5.2.4
Circuit Analyzer
Provide a circuit analyzer system, which, by means of 12 or more lights,
will indicate which circuits are energized at specific time, and will
thereby indicate any improperly operating circuit.
2.5.2.5
Control Panel
Programmer, limit control, relays, annunciator, shall be mounted in a [NEMA
MG 1 control panel, modified with fully gasketed doors and panels mounted
on burner package] [control panel as specified under VAMS Section 15901N
CONTROLS AND INSTRUMENTATION BOILER PLANT].
2.6
FANS
2.6.1
Forced Draft Fan
**************************************************************************
NOTE: The fan type shall be specified in accordance
with FS W-F-2793.
**************************************************************************
FS W-F-2793, Type [_____], Class 1, except as specified otherwise.
2.6.1.1
Fan Size
Size fans for complete combustion of fuel at maximum firing rate. Maximum
fan speed shall not exceed 1800 rpm at test block rating with [10] [20]
[40] percent excess air, taking into account design allowances, corrections
for burner or stoker pressure drop, furnace pressure, combustion air
temperature, plant elevation, and other design factors. Minimum static
efficiency at maximum continuous rating shall be [_____] percent. Add the
following allowances for momentary overloads and normal deterioration of
fans, firing equipment, and boilers after sizing fans in accordance with
the above to obtain the test block rating:
Coal-Fired
Excess Volume
Excess Pressure
Forced Draft
20 percent
32 percent
SECTION 15502N
Page 74
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