5 inches water.
**************************************************************************
Provide an air aspirating system for the fuel oil atomizer guide pipes to
prevent blowback of hot furnace gases. Aspirating system shall use
approximately [_____] L/s scfm of [_____] kPa (gage) psig compressed air.
2.5.1.7
Guide Pipe Purge
Provide piping and flexible hoses for the guide pipe purge and aspirating
systems. Air from the forced draft fan shall be provided for guide pipe
purging during normal operation.
2.5.1.8
Metal Parts
Metal parts exposed to radiant heat, including the atomizer shield, shall
be of stainless steel or other approved alloy.
2.5.1.9
Fuel Oil Control Valve
Fuel oil will be supplied at [_____] kPa (gage) psig and [_____] degrees C F
at the inlet of the fuel piping train. Size fuel oil automatic control
valve for 103 kPa 15 psi differential pressure as specified in VAMS Section
15901N CONTROLS AND INSTRUMENTATION BOILER PLANT.
2.5.1.10
Fuel
ASTM D 396, Grade no. [_____].
2.5.1.11
Forced Draft Fan
**************************************************************************
NOTE: The designer shall make a technical
evaluation to determine when the forced draft fan
should be integrated with or mounted separately from
the windbox on the floor next to the boiler. When
the forced draft fan is to be mounted separately,
delete this paragraph and specify the fan in
paragraph entitled "FANS."
**************************************************************************
Fan shall be fully integrated with and mounted on the windbox. Provide an
inlet silencer, when required, to ensure operation at noise level below 85
dBA as specified in Section 15070N MECHANICAL SOUND VIBRATION AND SEISMIC
CONTROL.
2.5.1.12
Electric Motor
**************************************************************************
NOTE: The designer shall perform an economic
analysis and make a technical evaluation to
determine when forced draft fan motor shall be
provided with variable speed control. Generally,
variable speed drives for forced draft fans over 7
1/2 kW 10 hp will be cost effective.
**************************************************************************
Motor shall be [variable speed], [_____] volt, [_____] phase, 60 Hz,
[totally enclosed, fan cooled], [totally enclosed, non-ventilated], not
SECTION 15502N
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