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 any specific time, and will
thereby indicate improperly operating circuits.
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
Submit fans and blowers characteristic curves.
2.6.1
Forced Draft Fan (Coal Firing)
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NOTE: The designer shall make a technical
evaluation to determine if the coal forced draft fan
should be integrated with the stoker front or
mounted separately on the floor.
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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 taking
into account design allowances, corrections for burner pressure drop,
furnace pressure, combustion air temperature, plant elevation, and other
design factors [including allowance for economizer]. After fans have been
sized in accordance with the above, add the following allowances for
momentary overloads and normal deterioration of fans, firing equipment and
boilers to obtain the required test block rating:
a.
Excess volume:
20 percent
b.
Excess pressure:
32 percent
2.6.1.2
Fan Construction
Construct fan wheel of steel. Direction of fan discharge shall be easily
changed at angles of 45 degrees. Provide fan with roller bearings mounted
in pillow blocks. Provide one coat manufacturer's shop prime paint over
interior and exterior of fan and wheel.
2.6.1.3
Electric Motor
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NOTE: The designer shall perform an economic
analysis and make a technical evaluation to
determine if the fan drive motor shall be provided
with variable speed control. Generally variable
speed drives for fans over 7 1/2 kW 10 hp will be
cost effective.
SECTION 15501N
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