MIL-PRF-13789E
4.5 Tests. Testing shall be in accordance with table IV and performed in the sequence. Unless
stated, the tests shall be performed at ambient temperatures.
TABLE IV. Test schedule
Test
Test description
Requirement
Test
paragraph
paragraph
T-1
Working pressure.
3.4.1
4.5.2
T-2
Hydrostatic pressure.
3.4.1
4.5.3
T-3
Strainer removal and deformation.
3.4.1
4.5.4
T-4
Environmental.
3.4.2
4.5.5
4.5.1 Test medium. Water shall be used as the test medium.
4.5.2 Working pressure. The strainer shall be subjected to the working pressure as specified
by class for a continuous period of 15 minutes. Leakage or sweating, when subjected to the
maximum working pressure, shall constitute failure of this test.
4.5.3 Hydrostatic pressure. The strainer shall be subjected to the hydrostatic pressure as
specified by class for a continuous period of 15 minutes. Leakage or sweating, when subjected to
the maximum hydrostatic pressure, shall constitute failure of this test.
4.5.4 Basket removal and deformation. With the hydrostatic pressure maintained as specified
by class, the downstream closure of the strainer shall be opened suddenly. Drain all fluid from the
strainer by opening the drain port. Remove the strainer basket and examine. Deformation,
collapse or bulging of the basket, when subjected to the maximum hydrostatic pressure and the
surging action during operating conditions, shall constitute failure of this test. The strainer basket
not being easily removed shall also constitute failure of this test.
4.5.5 Environmental. The environmental test shall consist of a 72 hour cycle performed on a
strainer. The strainer shall be placed in a temperature chamber and the temperature gradually
raised over a six hour period to 160 ± 3 °F. The temperature shall be maintained for a period of
24 hours. At the completion of the 24 hour period, the temperature shall be lowered to 73 ± 3 °F,
and maintained for six additional hours. Over the next six hour period, gradually lower the
temperature to -60 ± 3 °F and maintain for 24 hours. At the completion of the 24 hour period at
-60 °F, the temperature shall be raised to 73 ± 3 °F and maintained for six hours. Remove the
strainer for testing and repeat the functional tests 4.5.2, 4.5.3, and 4.5.4. Nonconformance to
3.4.2 shall constitute failure of this test.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in
the contract order (see 6.2). When actual packaging of material is to be performed by DoD
personnel, these personnel need to contact the responsible packaging activity to ascertain requisite
packaging requirements. Packaging requirements are maintained by the Inventory Control Point's
packaging activity within the Military Department or Defense Agency, or within the Military
Department's System Command. Packaging data retrieval is available from the managing Military
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