MIL-PRF-52308J
4.5.2 Structural strength. To determine conformance to 3.4.2, elements shall be tested in
accordance with API 1581, section 4.5.1 Structural Test. The category of test fuel used, for this
test only, shall be as specified in 4.4.2, with the exception that additives are optional.
4.5.3 Differential pressure, operational performance. Test sampling schedule and procedures
shall be in accordance with API 1581, section 4.3 Single Element Test Method for
Filter/Separators, and all subsections thereof for Type S filter-separators only and excludes
multi-stage systems, using the single element test vessel specified. Test sampling schedule and
procedures are also summarized in API 1581, Table 4, and API 1581, section 4.7 Test Sampling.
Nonconformance to 3.4.1, 3.4.2, 3.4.3 or 3.4.3.1 shall constitute failure of this test.
4.5.4 Environmental. The environmental tests shall be conducted in the following order. The
same complete set of elements shall be used for each environmental test, and the number of
samples in the set shall be as stated in the contract or order (see 6.2).
4.5.4.1 Transit drop. To determine conformance to 3.5.1, each element contained in their unit
package shall be dropped on a flat surface of solid concrete, from a height of 48 inches. All
drops shall be made so that the element falls freely through the distance specified. The element
shall be dropped eight times, four on each end of the unit package. Cracks or deformation of end
caps, or damage to element media shall constitute failure of this test.
4.5.4.2 Resistance to fuel, high temperature. The elements shall be immersed in the test fuel
for a minimum period of 100 hours at an ambient temperature of +140 °F (+60 °C), plus or
minus 5 °F (3 °C), and examined for defects. Nonconformance to 3.5.3 shall constitute failure of
this test.
4.5.4.3 Resistance to fuel, low temperature. The elements shall be immersed in the test fuel
for a minimum period of 100 hours at an ambient temperature of -25 °F (-32 °C), plus or minus 5
°F (3 °C), and examined for defects. Nonconformance to 3.5.3 shall constitute failure of this
test.
4.5.4.4 Resistance to salt water. The elements shall be immersed in a solution consisting of
4% sodium chloride (NaCl) and 96% distilled water by weight for a period of 72 hours, and
examined for defects. Nonconformance to 3.5.3 shall constitute failure of this test.
4.5.4.5 Post-environmental performance. The elements shall be tested in accordance with
API 1581, section 4.4 Full-Scale Test Method for Filter/Coalescers, and all subsections thereof
for Type S filter-separators only and excludes multi-stage systems, using the full-scale vessel
specified. Test sampling schedule and procedures are also summarized in API 1581, Table 5, and
API 1581, section 4.7 Test Sampling. Nonconformance to 3.4.2 or 3.4.3 shall constitute failure
of this test.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in
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