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|  MIL-C-16645A(SHIPS)
4.4.3 Each compressor unit not selected in accordance with 4.2 shall be subjected to tests
exactly as required by 4.4.2, except:
(a) The duration of the test need not exceed 4 hours, and data need be taken only
at the start and finish of the run and arc in between,
(b) The units need not be disassembled upon completion of the -performance tests,
unless excessive nesting, noise, vibration, or erratic performance is noted
during the tests.
4.4.3.1 If excessive heating, noise, vibration, or erratic performance is noted, and is corrected
the 4-hour test shall be repeated. If the first correction does not completely eliminate the trouble, then
after further correction the compressor snail be subjected to a complete 8-hour test before acceptance.
4.4.3.3 All record d data and co ip nations required ior the 8-hour test are also required for the
4-hour test.
4. 4.4 Inclined operation. - One compressor unit, including the driving motor, shall be selected
by the Government inspector for tests to determine satisfactory compliance with 3.3.1.
4.4.4.1 Only one compressor of each design shall be subjected to the inclination tests, and the
tests need not be repeated on later contracts or orders unless the Government inspector or bureau or
agency concerned considers that sufficient changes have been made from the tested design to warrant
retesting. Neither changes in materials only of compressor construction, nor changes in the driving
motor shall be considered as reasons for retesting.
4.4.4.2 The -compressor unit shall be operated at rated load for not less than 30 minutes with the
base tilted 15 degrees in each of the four cardinal positions, right, left, f rent, and rear. During the
progress of these tests there shall be no excessive heating of any parts, and noise and vibration shall
not exceed that of normal horizontal operation.
4.4.4.2 The suitability of the compressor unit for operation when a ship is rolling or pitching
shall be determined by inspection of the design.
4.4.5 High-impact shock test. - One compressor unit including the driving motor, shall be selected
by the Government inspector for type A shock tests in accordance with Specification MIL-S-901.
4.4.5.1 Only one compressor of each design shall be subjected to the shock tests, and the tests
need not be repeated on later contracts or orders unless the Government inspector or bureau or agency
concerned considers that sufficient changes have been made from the tested design to warrant retesting.
Changes in materials of construction of the compressor will require retesting. Changes in the driving
motor shall not be considered a reason for retesting of the compressor.
4. 4.5.2 The compressor shall be idle and running on alternate blows of the shock test, but the
compressor shall not be compressing air while runnihg. .
4. 4. 5.3 Inspection after shock test.-
4. 4.5.3.1 Motor. - Inspection of the motor shall be in accordance with Specification MIL-M-17060
or
MIL-M-17413.
4.4.5.3.2 Compressor. - Inspection of the compressor shall be conducted as follows:
(a) Examine the unit carefully and note the extent of any external damage,
(b) Jack the compressor over several times by hand to insure that all
working parts are free and ready for starting,
(c) Run the compressor unloaded for a short time and note any mechanical peculiarities,
(d) Gradually build up the had and carefully check any undue noises, excessive vibration.
(e) Secure the compressor and disassemble for complete inspection. Observe and record
all effects of the shock test on the various compressor components.
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