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|  MIL-C-52973A(ME)
4.5.2.11 Electromagnetic interference.
The compressor unit shall be
subjected to the test specified in MIL-STD-461 for class III C equipment.
Nonconformance to MIL-STD-461 shall constitute failure of this test.
The slinging and tiedown
4.5.2.12 Slinging and tiedown provisions.
provisions shall be subjected to the loads and corresponding durations specified
in MIL-STD-209 and the tiedown provisons shall be tested for the ultimate
strength as specified in MIL-STD-209.
Yield strength or ultimate strength not
as specified in MIL-STD-209, shall constitute failure of this test.
4.5.2.13 Endurance phase. The compressor unit endurance test shall be con-
ducted without shelter and at the climatic conditions existing at the place of
The complete unit shall be operated (see 6.3.1) at rated capacity for 500
test.
hours.
Endurance test time will not be credited in less than 4-hour intervals
of continuous operation, and a capacity computation shall be made from every
fifth set of 4 hours data reading specified in 4.5.2.13.2. During the endurance
phase the following shall be checked at least once.
a.
Fuel tank capacity for conformance to 3.9.2.
b.
Ease of starting the compressor unit with the filter system charged to
a pressure not less than 3200 psig.
4. 5.2.13.1 Cycling phase.
The cycling phase shall be for a total test time
The compressor shall be cycled to operate through a complete
of 8 hours.
Unloading shall be for not more than 1
loading-unloading cycle every 5 minutes.
At the end of the cycling test phase, remove the compressor
minute duration.
from cycling operation and operate the compressor at rated capacity for 1 hour.
After 1-hour operation, make a capacity computation. During the cycling phase,
observe the pressure control valve for operation in accordance with 3.11.
Air capacity shall be recorded as specified in 4.5.2.1
4.5.2.13.2 Test data.
along with the constant factors and data used to compute the capacity figure.
Air purity at the final filter outlet shall be recorded immediately before and
after each filter change, and at least once in every 8 hours, plus or minus 0.5
Air purity measurements shall be made by methods
hour of compressor operation.
specified in BB-A-1034, ASTM F 307 and NAVCSEA 0994-LP-001-9020; by gas
chromatography; or by any other means approved by the Government prior to test.
Downtime data shall be recorded each time the compressor is stopped, including
the stop-time and date, accumulated operating hours, start-time and date,
duration of downtime in hours and minutes, the reason for each stop, and the
amount of fuel and lubricants used. The following set of data shall be recorded
every 4 hours, plus or minus 0.5 hour:
a.
Air temperature, ambient.
b.
Air temperature at compressing unit intake.
Air temperature at final filter inlet.
c.
d.
Air pressure at compressing unit intake.
Air pressure at final filter outlet.
e.
f.
Barometric pressure.
Engine rpm.
g.
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