Pressure regulation, size 5-cfm

Page Title: Pressure regulation, size 5-cfm
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MIL-C-52980B

4.5.2.6 High temperature. Unless otherwise specified (see 4.5.2.18), subject the compressor

to an ambient temperature of 120 +5 F until all components have stabilized at this temperature.

Then start and operate the compressor at rated capacity and pressure for not less than 4 hours

while maintaining 120 +5 F ambient temperature. Adjustments to the engine or compressor unit

shall not be permitted after the first hour of operation. The operating time for this test may be

counted toward the accomplishment of the endurance test. Record the data as specified in

4.5.2.5 at 30-minute intervals. Failure to start and operate at rated capacity, pressure and speed,

discharge air temperature in excess of ambient +100 F or requirement for replacement of parts

shall constitute failure of this test.

4.5.2.7 Low temperature. Unless otherwise specified (see 4.5.2.19), subject the compressor

to an ambient temperature of -25 +5 F until all components have stabilized at this temperature.

Then start and operate the compressor at rated capacity, pressure and speed for not less than

4 hours while maintaining minus 25 +5 F ambient temperature. Adjustments to the engine or

compressor unit shall not be permitted after the first hour of operation. The operating time for

this test may be counted toward the accomplishment of the endurance test. Record the data as

specified in 4.5.2.5 at 30-minute intervals. Failure to operate at rated capacity, pressure and

speed, or requirement for replacement of parts shall constitute failure of this test.

4.5.2.8 Cycling. Start the compressor and allow the receiver pressure to build up until the

pressure-regulation control operates. Then reduce the receiver pressure until the

pressure-regulation control activates to increase the pressure. Vary the pressure as above until a

total of 20 high-pressure actuations and 20 low-pressure actuations have been reached. Inability

of the pressure-regulation control to control the pressure as specified shall constitute failure of

this test.

4.5.2.9 Pressure regulation, size 5-cfm. When an adjustable pressure-regulating valve of the

pressure-relief type actuated by receiver pressure is used, at the beginning and after completion

of the endurance test, start the compressor and allow the receiver pressure to build up to

determine pressure required to discharge full capacity through the pressure-regulating valve.

Then reduce the receiver pressure to determine the pressure at which the pressure-regulating

valve reseats. Inability to meet the requirements specified in 3.26.8 shall constitute failure of this

test.

4.5.2.10 Electromagnetic interference. The compressor sha1l be tested in accordance with

MIL-STD-462 to determine conformance to 3.11. The contractor shall furnish the contracting

officer the first article test report for evaluation. Failure to meet the requirements of 3.11 shall

constitute failure of this test.

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