MIL-PRF-26873D
4.5.1 Individuals tests. Each suppressor shall be subjected to the following tests as described
under 4.6:
a. Examination of the product
4.6.1
b. Hydrostatic pressure test
4.6.2
4.6 Test methods.
4.6.1 Examination of the product. The surge suppressor shall be inspected to determine
compliance with the requirements specified herein with respect to materials, workmanship,
dimensions, and markings.
4.6.2 Hydrostatic pressure test. The surge suppressor housing shall be hydrostatically tested to
300 psig. The bellows assembly shall be hydrostatically tested with an internal pressure of 150
psig against a precharged gas pressure of 52 ±2 psig. The housing the bellows assembly shall not
leak at the pressures specified.
4.6.3 Environmental tests. An engineering evaluation concerning the ability of the equipment to
resist the exposure specified in 4.6.1.1 through 4.6.1.6 shall be considered as meeting the tests
specified herein.
4.6.3.1 Surge cycling tests.
4.6.3.1.1 Storage temperatures. The surge suppressor shall not be damaged by storage in
ambient temperatures between -80° F and +160° F for not less than 50 hours. At the conclusion
of the test, the surge suppressor shall be visually examined for evidence of failure or deterioration.
There shall be no internal no external leakage.
4.6.3.1.2 Operating temperatures. The surge suppressor shall perform as specified herein at
ambient temperatures between - 40° F and +125° F. At the conclusion of the test, the surge
suppressor shall be visually examined for evidence of failure or deterioration. There shall be no
internal nor external leakage as a result of this test.
4.6.3.2 Humidity test. The surge suppressor shall not be damaged by operation or storage in any
relative humidity up to and including 100 percent, including conditions wherein condensation
takes place in the form of water and frost. At the conclusion of the test, the surge suppressor shall
be subjected to the surge cycling tests specified in 4.6.1.
4.6.3.3 Sand and dust test. The surge suppressor shall not be damaged by operation or storage in
an atmosphere containing sand and dust particles as encountered in desert areas. At the
conclusion of the test, the surge suppressor shall be subjected to the surge cycling tests specified
in 4.6.3.1.1.
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