MIL-PRF-83860D
4.6.2.1 Initial bubble point. The initial bubble point of each filter element shall be
determined in accordance with the procedures in SAE-ARP901. The lowest initial bubble point
of the four filter elements is the value to be used in al subsequent tests referring to initial bubble
point. Filter elements having an initial bubble point of less than 3 inches of water are not
acceptable.
4.6.2.2 Conformance bubble point. Each filter element shall be submerged in test fluid
(see 4.4.1) and an air pressure set to 0.1 inch of water less than the initial bubble point shall be
applied to the filter element. No bubbles shall emerge from the filter element.
4.6.3 Cold start. The filter element shall be installed in a test filter housing filled with a
test fluid, placed in a test system (see figure 5), and subjected to a temperature of -65° ±5°F for
four hours. At or below this test fluid temperature, 10 flow cycles shall be conducted, at the
differential pressure shown in table I, with each cycle 15 ±1 seconds in duration. The test filter
housing relief valve, where applicable, shall be blocked during this test. There shall be no filter
media damage as evidenced by satisfactory completion of subsequent tests in table II. The filter
element pressure drop shall not exceed the clean element pressure drop in table I after
performing the cold start test.
4.6.3.1 Media migration. During the first and tenth cycles of the test in 4.6.3, using filter
element number four, 500 millimeter (mL) of test fluid shall be collected after passing through
the filter element. Prior to collecting the test fluid samples, the sampling line, fittings and valve
shall be flushed. The fluid shall be analyzed in accordance with the procedures in SAE-ARP785
and the abrasion migration test in 4.6.8. The weight of contaminant collected in each sample
shall be multiplied by four and shall not exceed the abrasion migration value shown in table I.
4.6.4 Efficiency. The efficiency for filter elements is computed as specified in 4.6.4.1
and shall meet the contaminant removal by weight specified in the efficiency test in table I.
4.6.4.1 Efficiency computation.
A - (B C)
Efficiency =
x 100
(1)
A
where: A = add value
B = contaminant value
C = blank value
4.6.4.2 Contaminant value (B). The filter element shall be installed in a test filter
housing and placed in a test system (see figure 6) which has been previously flushed with pre-
cleaned test fluid (see 4.4.1.1). Test fluid (2,000 mL) shall be added to the test system. Then, a
slurry containing the add value of contaminants shown in table I shall be mixed with the test
fluid. The test fluid, at the rated flow specified in table I, shall be passed through the filter
element and then through a previously cleaned and weighed filter membrane (0.8 micron
absolute) (see 6.5). The test fluid shall be collected and the filter membrane weighed. The
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