(i)
Any additional as required by FM DS 12-17 orNFPA 8501
(5) Annunciator: 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
ANDINSTRUMENTATIONS BOILER PLANT.]
d.
Light Off: Failure shall require a manual restart of the
programmer. 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.
e.
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 circuit.
f.
Control Panel: Programmer, limit control, relays and annunciator,
shall be mounted in a [NEMA 1 control panel, modified with fully
gasketed doors and panels mounted on burner package] [control
panel as specified under VAMS Section 15901N CONTROLS AND
INSTRUMENTATIONS BOILER PLANT.]
2.5
FANS
**************************************************************************
NOTE: The designer shall make a technical
evaluation to determine if the forced draft fan
should be integrated with or mounted separately from
the windbox on the floor next to the boiler. If the
forced draft fan is to be mounted separately, delete
this paragraph and specify the fan in paragraph
entitled "Fans."
**************************************************************************
2.5.1
Forced Draft Fan
FS W-F-2793, Type [_____], Class 1, except as specified otherwise.
2.5.1.1
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
a.
Excess volume:
10 percent
b.
Excess pressure:
20 percent
2.5.1.2
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
SECTION 15511N
Page 38
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