MIL-PRF-83870C
4.6.8.3 Cycling test. The filter assembly shall be vibrated along each axis at the vibration level and frequencies in part
2 of table V for a total of 3 hours, less the resonance dwell time for each axis in 4.6.8.2. Vibration frequencies shall be
logarithmically swept from 5 to 2,000 to 5 Hz during a 20 minute interval.
4.6.8.4 Determine media migration. Remove inlet and outlet port caps and, without loss of test fluid, install the filter
element in a test system (a typical test system is shown in figure 11). Close the test system, pressurize the pre-cleaned
test fluid to obtain rated flow, pass one gallon of the test fluid through the filter element, and then pass the test fluid
through a previously cleaned 0.8 micron absolute filter membrane (see 6.6). The filter membrane shall be examined
under a microscope and there shall be no filter element media migration. There shall be no sign of structural failure
indicated through a visual examination and the bubble point test in 4.6.2.1.
4.6.9 Filter element pressure relief valve.
4.6.9.1 M-83870-6 pressure relief valve (see figure 5). The filter element media shall be blocked, the filter element
installed in a test filter housing, and placed in a test system filled with test fluid pre-cleaned in accordance with 4.4.1.1.
Test fluid pressure shall be applied to the inlet port of the test filter housing and shall be increased until the cracking
(opening) pressure of the pressure relief valve is reached. The cracking pressure shall occur at 100 ± 10 psi. The test
fluid pressure at the inlet port of the test filter housing shall be increased until the test fluid flow rate through the pressure
relief valve is 11 gal/min. The differential pressure between the inlet and outlet ports of the test filter housing at this flow
rate shall be 160 psi maximum. The test fluid pressure at the inlet port of the test filter housing shall be reduced until the
pressure relief valve reseats (closes). The pressure relief valve reseating pressure shall be 65 psi minimum.
4.6.9.2 M-83870-7 pressure relief valve (see figure 6). The filter element media shall be blocked, the filter element
installed in a test filter housing, and placed in a test system filled with test fluid pre-cleaned in accordance with 4.4.1.1.
Test fluid pressure shall be applied to the inlet port of the test filter housing and shall be increased until the cracking
(opening) pressure of the pressure relief valve is reached. The cracking pressure shall occur at 50 ± 10 psi. The test
fluid pressure at the inlet port of the test filter housing shall be increased until the test fluid flow rate through the pressure
relief valve is 3 gal/min. The differential pressure between the inlet and outlet ports of the test filter housing at this flow
rate shall be 75 psi maximum. The test fluid pressure at the inlet port of the test filter housing shall be reduced until the
pressure relief valve reseats (closes). The pressure relief valve reseating pressure shall be 38 psi minimum.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order
(see 6.2). When packaging of materiel 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 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
Department or Defense Agency automated packaging files, CD-ROM products, or by contacting the responsible
packaging activity. Sample filter elements used for conformance tests shall be free of all contaminants and test fluid
prior to packaging.
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