in pillow blocks.
2.5.1.3
Electric Motor
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NOTE: The designer shall perform an economic
analysis and make a technical evaluation to
determine if the 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.
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Motor for driving the forced draft fan shall be [variable speed], [two
speed], [_____] volt, three phase, 60 Hz, [open drip-proof] [totally
enclosed, fan cooled] not less than [_____] kW hp, as specified under
"Motors and Drives" in this section, and shall not overload at the
specified capacity with unheated cold air. [Provide [_____] mm inch thick
steel soleplate for motor. Soleplate must be common for all four motor
mounting bolts. Separate parallel soleplate bars are not acceptable.]
2.5.1.4
Noise Level
Noise level shall not exceed 85 dBA sound pressure level at 1 1/2 meters 5
feet above the floor and 1 1/2 meters 5 feet from the fan in any direction.
[Provide heavy duty sound attenuator with screen on fan inlet, if
required, to meet the sound pressure level requirements.]
2.6
COMPRESSED AIR SYSTEM
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NOTE: Refer to utilities schedule on definitive
drawings for suggested plant air requirements.
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2.6.1
Plant Compressed Air System
Provide [two] packaged units conforming to FS XX-C-2816 Type [_____], and
ASME BPVC SEC VIII D1, except as modified below. Each compressor capacity
shall be not less than [_____] L/s scfm of air, at 20 degrees C 68 degrees F
and [_____] kPa (gage) psig (equivalent to pressure at an elevation of
[_____] meters feet), compressed to 1379 kPa (gage) 200 psig at the
discharge. Compressor speed shall not exceed [_____] rpm. Number of
stages shall be [_____]. [Compressor shall have water cooled cylinders and
heads.] [Oil free delivery is required.] Provide a safety valve between
each compressor discharge and its shutoff valve. Provide a shutoff valve
on the discharge piping of each compressor. Provide an electric
thermostatically controlled immersion heater. Provide compressor with [air
cooled] [water cooled] [intercooler and] aftercooler. [Compressor and
motor shall be tank mounted.] Provide lifting lugs and tie down
attachments.
2.6.1.1
Air Filter
Air filter on inlet shall act as a muffler. Provide filter of the [oil
wetted type] [dry type] readily removable for cleaning.
SECTION 15511N
Page 39
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