MIL-HDBK 1028/6A
and Dehumidifying Systems and DM-3.05. Furnish compressor and auxiliary
equipment as a coordinated assembly by the air compressor manufacturer
requiring a maximum of 23 bhp for each 100 cfm (2.8 cu. m/min) of intake
air. Compressors shall operate satisfactorily, individually, or in parallel
with any combination of other units. Furnish compressor and compressed air
system controls to provide fully automatic operation.
3.3.1
Air Compressor and Auxiliaries. Provide compressors and the
auxiliary assembly as defined in pars. 3.3.1.1 through 3.3.1.10.
3.3.1.1
Compressor. Provide a multiple-stage, water-cooled, oil-free
style centrifugal or rotary screw type compressor.
3.3.1.2
Intercoolers and Aftercooler. Provide shell and tube type
intercoolers and aftercoolers, either both water-cooled or both
air-cooled with moisture separator and drain trap.
3.3.1.3
Drive Motor. Provide a 3600 rpm, squirrel cage, induction motor
for centrifugal compressor and 1800 rpm, constant-speed, synchronous motor
for rotary screw compressor. Also provide a drip-proof electric motor rated
5000 V, three-phase, 60 Hz.
3.3.1.4
Air Intake Filter-Silencer. Provide a two-stage, dry media type
air intake filter-silencer with disposable elements. The filter shall be
installed between outdoor weathertight intake hood and compressor intake
and shall be designed to attenuate noise.
3.3.1.5
Oil Separator. Provide a three-stage coalescing type oil
separator with bolted and hinged access flange for removable filter media.
Install the unit shall be installed between the compressor discharge and
air dryer.
3.3.1.6
Refrigerated Air Dryer. Provide a self-contained, commercial
quality refrigeration system shall be provided with moisture separator,
condensate trap and internal wiring and piping. Install dryer between oil
separator and main air line.
3.3.1.7
Cooling Water Assembly (Evaporative Type). Provide a closed-
circuit type with continuous cooling water recirculation and include
evaporative cooling coil, centrifugal forced draft fan, recirculating spray
pump, electric motor drives, mist eliminators, and interconnecting piping
mounted on a common steel base.
3.3.1.8
Alternate Cooling Water Assembly. Use a radiator type cooling
water assembly for climates of 80 degrees F (27 degrees C) and below.
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