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|  MIL-C-52980B
4.5.2.4 Capacity and performance. The compressor capacity shall be determined in
accordance with the method specified in the ASME Performance Test Code 9. This test shall be
performed in conjunction with and simultaneously with the endurance test (see 4.5.2.5). The
air-discharged temperature shall be determined when the compressor is operating at minimum
capacity at maximum discharge pressure. Anyone of the following conditions shall constitute
failure of this test:
a. Discharge air pressure less than 175 psig.
b. Discharge air temperature in excess of ambient plus 100 F.
c. Free-air capacity less than that specified in table I.
4.5.2.5 Endurance. Operate the compressor for not less than 500 hours continually in periods
of not less than 8 hours of running time. For this test, an auxiliary fuel supply system may be
used to permit operation for 8 hours without refueling. If an auxiliary fuel system is not used,
periods of nonoperation of not more than 10 minute duration will be allowed for refueling. The
refueling time shall not be counted as operating time but shall not cause disallowance of the
operating period during which it takes place. Oil changes and other preventive maintenance
shall be performed during downtime. There shall be no replacement of parts. Adjustments
provided by integral devices and repairs which require 1 man-hour or less may be made. The
500 hours of operation shall be accomplished at rated capacity and pressure. Record appropriate
remarks, including a record of all stops and adjustments. Record the following data at least once
during each 24 hour period. Readings shall be taken only after at least 1 hour of continuous
operation:
a.
Air temperature, ambient.
b.
Air temperature at receiver discharge.
c.
Air receiver pressure.
d.
Barometric pressure.
e.
Air temperature at compressor intake.
f.
Air temperature upstream of nozzle.
g.
Air pressure of compressor intake.
h.
Nozzle throat diameter.
i.
Nozzle coefficient of discharge.
j.
Differential pressure across the nozzle.
k.
Engine speed (rpm).
l.
Compressor unit speed (rpm).
m.
Compressor capacity (cfm) computed.
n.
Engine intake air temperature.
o.
Engine oil pressure (if pressure lubricated).
p.
Engine oil sump temperature.
Completion of less than 500 hours of operation at rated capacity and pressure, discharge air
temperature in excess of ambient + 100 F, requirement for replacement of parts, requirement for
repairs requiring more than 1 man-hour to complete, or necessity for adjustment not provided for
by integral devices shall constitute failure of this test.
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