Updated Technical Requirements Air Compressors.pdf
PDF 95 KB Posted
- Attached to
- TWO AIR COMPRESSORS AND RECEIVER TANK Federal contract opportunity
- Solicitation number
- FA660626Q0008
About this file
This document is a technical specification for compressed air system equipment and components. The specification establishes requirements for air compressors, air receivers, filters, dryers, regulators, and associated piping materials.
Air compressors must be factory-packaged assemblies with three-phase, 240-volt motors housed in NEMA 250, Type 1 enclosures and comply with UL listing requirements. Units require manual-off-automatic switches, intake air filters, silencers, aftercoolers, and moisture separators. Lubricated compressors must be single-stage, gear-drive units operating at maximum 3600 rpm with either roller or ball main bearings. Air receivers must be designed for 200 psi working pressure, factory air tested to 1.5 times working pressure, and constructed in accordance with ASME BPVC SEC VIII D1 standards with ASME seal certification or approved independent testing laboratory reports. The specification also requires intake air supply filters with 99 percent collection efficiency for particles larger than 10 microns and maximum withstand pressure of 125 psi. Pressure regulators must be single-seated, pilot-operated with bronze bodies, designed for maximum inlet pressure of 175 psi and maximum temperature of 200 degrees Fahrenheit, and include pressure gauges with adjustment capability from 0 to 175 psi. Refrigerated air dryers must be cycling, air-cooled, thermal mass type units capable of delivering 38 degrees Fahrenheit, 100 psig air at dew point with automatic condensate ejection. Copper tubing must meet ASTM B88, Type L specifications with ASME B16.22 solder-joint pressure type fittings. Compressed air filters must be provided upstream and downstream of the air dryers as recommended by the compressed air system supplier.
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Text version
Air Compressors (AC)
Air compressor unit shall be a factory-packaged assembly, including 3 phase, 240 volt motor controls, switches, wiring, accessories, and motor controllers, in a NEMA 250, Type 1 enclosure. Air compressors shall be manufactured to comply with UL listing requirements. Air compressors shall have manufacturer's name and address, together with trade name, and catalog number on a nameplate securely attached to the equipment. Each compressor shall have a manual-off-automatic switch that when in the manual position, the compressor loads and unloads to meet the demand and, in the automatic position, a time delay relay shall allow the compressor to operate for an adjustable length of time unloaded, then stop the unit. Guards shall shield exposed moving parts. Each duplex compressor system shall be provided with automatic alternation system. Each compressor motor shall be provided with an across-the-line-type magnetic controller, complete with low-voltage release. An intake air filter and silencer shall be provided with each compressor.
Aftercooler and moisture separator shall be installed between compressors and air receiver to remove moisture and oil condensate before the air enters the receiver. Aftercoolers shall be air cooled, as indicated. The air shall pass through a sufficient number of tubes to affect cooling.
Tubes shall be sized to give maximum heat transfer. Cooling capacity of the aftercooler shall be sized for the total capacity of the compressors. Means shall be provided for draining condensed moisture from the receiver by an automatic float type trap. Capacities of air compressors and receivers shall be as indicated.
Lubricated Compressors
Compressors shall be single stage, gear drive, capable of operating continuously against their designed discharge pressure, and shall operate at a speed not in excess of 3600 rpm. Compressors shall have the capacity and discharge pressure indicated. Compressors shall be assembled complete on a common subbase. The compressor main bearings shall be either roller or ball. The discharge passage of the high pressure air shall be piped to the air receiver with a copper pipe or tubing. A pressure gauge calibrated to 150 psi and equipped with a gauge cock and pulsation dampener shall be furnished for installation adjacent to pressure switches.
Air Receiver(s) (AR)
Air Receiver(s) shall be designed for 200 psi working pressure. Receivers shall be factory air tested to 1-1/2 times the working pressure. Receivers shall be equipped with safety relief valves and accessories, including pressure gauges and automatic and manual drains.
The outside of air receivers may be galvanized or supplied with commercial enamel finish.
Receivers shall be designed and constructed in accordance with ASME BPVC SEC VIII D1 and shall have the design working pressures specified herein. A display of the ASME seal on the receiver or a certified test report from an approved independent testing laboratory indicating conformance to the ASME Code shall be provided.
Intake Air Supply Filter
Dry type air filter shall be provided having a collection efficiency of 99 percent of particles larger than 10 microns. Filter body and media shall withstand a maximum 125 psi, capacity as indicated.
Pressure Regulators
The air system shall be provided with the necessary regulator valves to maintain the desired pressure for the installed equipment. Regulators shall be designed for a maximum inlet pressure of 175 psi and a maximum temperature of 200 degrees F. Regulators shall be single-seated, pilot-operated with valve plug, bronze body and trim or equal, and threaded connections. The regulator valve shall include a pressure gauge and shall be provided with an adjustment screw for adjusting the pressure differential from 0 to 175 psi. Regulators shall be sized as indicated.
Refrigerated Air Dryer(s) (AD)
Cycling, air-cooled, thermal mass type, electric-motor-driven unit with steel enclosure and capability to deliver 38 degrees F, 100 psig air at dew point. Include automatic ejection of condensate from airstream, step-down transformers, disconnect switches, inlet and outlet pressure gauges, thermometers, automatic controls, and filters.
Copper Tubing
ASTM B88, Type L, seamless, drawn-temper, water tube. Wrought-copper fittings, ASME B16.22, solder-joint pressure type.
Compressed Air Filter(s)
Provide compressed air filters upstream and downstream of the compressed air dryers as recommended by the compressed air system supplier.
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