MIL-DTL-45334E
4.5.3.3 Discharge air temperature test. While operating as specified in 4.6.1, discharge
air temperature shall be measured and recorded. Values shall not exceed those specified to
determine conformance to 3.4.1.3.
4.5.3.4 Life test. To determine conformance to 3.4.1.4, the compressor shall be cycled
for 1000 hours in accordance with table VII. During the complete life test compressors shall be
operated at no load and 100 psig (690 kPa) in alternate cycles. The rate of oil consumption
(including leakage) shall be determined each 100 hours during the last 800 hours. The
compressor may be driven by a gear drive, a coupling, or a belt drive. Belt drive shall produce a
torque of 240 +30 inch-pounds (in-lb), (27.12 +3.4 Newton-meters (N-m)), on the crankshaft
toward the compressor base measured from the centerline of the compressor. If the belt drive is
not used, this torque shall be maintained on the crankshaft toward the base of the compressor.
TABLE VII. Life cycle test.
Speed, rpm
Time, hours
1800
17
2400
6
0 (idle)
1
4.5.3.5 Pressure buildup time test. The compressor shall be driven, loaded, at a speed of
600 rpm for a half hour when it is a reciprocating type, or for 15 minutes for a rotating type. The
compressor shall then be connected to discharge into a tank with a capacity of 2000 cubic inches
(in.3) +5 percent. The time required for the compressor to raise the tank pressure to 100 psig
(690 kPa), and the temperature of air at 100 psig (690 kPa), shall be recorded. The test shall be
repeated at compressor speeds of 1200, 1800, and 2400 rpm, except the initial warm-up at each
speed is not required. The pressure buildup time, in seconds per 1000 in.3 of reservoir volume,
shall be computed to determine conformance to 3.4.1.5.
4.5.4 Governor tests.
4.5.4.1 Pressure settings test. To determine conformance to 3.4.2.1, average pressure
shall be obtained as follows: The governor shall be conditioned at temperatures of 125°F +5°F
(51.6 +2.8°C) for 24 hours, and -65 +5°F (-53 +2.8°C) for 24 hours. Average cut-in and cut-out
pressures shall then be determined from a series of 10 cycles at 72 +10°F (22.2 +5.5°C).
Subsequent pressure setting tests will be performed at 72°F +10°F only. Average pressures shall
not vary more than +5 percent from specified values.
4.5.4.2 Life test. To determine conformance to 3.4.2.2, the governor shall be subjected
to 100 000 cycles of cut-in and cut-out operation. The supply pressure shall range from at least
5 psi (34 kPa) below cut-in pressure to at least 5 psi (34 kPa) above cut-out pressure, at 20 cycles
per minute, as determined in 4.5.4.1.
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