MIL-HDBK 1028/6A
3.2.1.2
Intercooler. Air-cooled finned-tube coil or water-cooled type,
directly or remotely attached to compressor.
3.2.1.3
Motor. V-belt drive, open-drip proof, squirrel-cage, electric
motor rated 460 V, three-phase, 60 Hz with 1.15 service factor.
3.2.1.4
Air Intake Filter Silencer. Dry-media type with disposable
elements. Install filter silencer on compressor intake and design to
attenuate intake noise to 84 dBA or less.
3.2.1.5
Aftercooler. (For warm climates above 85 degrees F
(29.4 degrees C) design dry bulb.) Provide shell and tube water-cooled type
mounted between compressor and air dryer. Furnish aftercooler with moisture
separator, drain trap, and sight flow indicator.
3.2.1.6
Aftercooler (Alternate). (For cool climates 85 degrees F design
dry bulb and below.) Provide horizontal or vertical draft finned tube heat
exchanger with propeller type fan and electric motor all assembled on
heavy-duty frame in a galvanized steel housing.
3.2.1.7
Oil Separator. Provide three-stage coalescing type with bolted
and hinged access flange for removable filter media. The unit shall be
installed between the system aftercooler and air dryer.
3.2.1.8
Refrigerated Air Dryer. Provide self-contained, commercial
quality refrigeration system with moisture separator, condensate trap and
all internal wiring and piping. Dryer shall be installed between oil
separator and air receiver tank.
3.2.1.9
Cooling Water Assembly (for Water-Cooled Aftercooler). Closed
circuit type with continuous cooling water recirculation shall 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.
3.2.1.10 Circulating Pumps. Circulating pumps shall be end-suction
centrifugal type installed inside the central facilities building.
3.2.1.11 Controls. Compressors and compressed air system shall be
furnished with completely factory-assembled control system. Control system
shall provide automatic capacity control (load sequencing) and safety
controls for warning and equipment protection. A freestanding cabinet type
control panel shall be furnished and installed near the compressors.
3.2.2
Air Receiver Storage Tanks. Air receiver tanks shall be
horizontal, cylindrical, welded steel tanks designed for 250 psig working
pressure in accordance with American Society of Mechanical Engineers
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