MIL-C-0052980C(ME)
10-minute duration shall 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
There shall be no replacement of parts.
during downtime.
Adjustments provided by integral devices and repairs which require
The 500 hours of operation shall be
1 man-hour or less may be made.
Record appropriate
accomplished at rated capacity and pressure.
Record
remarks, including a record of all stops and adjustments.
the following data at least once during each 24-hour period.
Readings shall be taken only after at least 1 hour of continuous
operation:
Air temperature, ambient.
a.
b.
Air temperature at receiver discharge.
Air receiver pressure.
c.
Barometric pressure.
d.
Air temperature at compressor intake.
e.
Air temperature upstream of nozzle.
f.
Air pressure of compressor intake.
g.
h.
Nozzle throat diameter.
Nozzle coefficient of discharge.
i.
Differential pressure across the nozzle.
j.
k.
Engine speed (rpm).
l.
Compressor unit speed (rpm).
Compressor capacity (cfm) computed.
m.
n.
Engine intake air temperature.
o.
Engine oil pressure (if pressure lubricated).
Engine oil sump temperature.
p.
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.
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
Adjustments to the engine or compressor unit shall not
temperature.
The operating time
be permitted after the first hour of' operation.
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.
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