F-F-351F
4.6.1 Pressure resistance. To determine conformance to 3.5.1, one type I, class 3 filter
body (see 3.4.1.1.2), assembled with the cover tightened to 25 ft-lb with a torque indicating
wrench, shall be subjected for a period of 5 minutes to an internal pressure of 150 psi. Lacking a
detachable cover, the test procedure for the type I, class 1, style B filter assembly shall consist of
subjecting filter, installed on an applicable mounting plate, to an internal pressure of 100 psi for a
period 5 minutes. Testing shall be made with test oil (see 4.5.5) held at a temperature of 200°F
(93°C), or, if air pressure is used, filter shall be immersed in a suitable bath at 200°F. During and
after the test, the sample assembly shall be examined for conformance to 3.5.1.
4.6.2 Media migration . Media migration for filter elements shall be determined as
specified in 4.6.2.1 through 4.6.2.3.
4.6.2.1 Elements for type I, class 3 filters. To determine conformance to 3.5.2.1,
applicable elements shall be tested for media migration in a standard filter body mounted in front
of, and in series with, a 0.0015 in spacing metal edge strainer. Ten quarts of test oil (see 4.5.5)
shall be circulated through filter body and through the metal edge strainer for a 4-hour period at
30 psi (206.8 kg) inlet pressure to the filter body and with the oil held at a temperature of
180°F (82°C). At the end of this 4-hour period, the strainer shall be removed and placed over a
clean glass beaker to collect the oil drainings. The strainer shall be rinsed into the beaker with
ASTM precipitation naptha which has been filtered through a Gooch crucible (Selas #28-080XF),
or equal, fritted or sintered integral bottom) using a rubber policeman to clean all strainer surfaces.
All remaining oil in the strainer body shall be drained, the strainer body shall be rinsed with filtered
naptha, and both the oil and the washings shall be collected in the same beaker used for the
washings from the strainer. The oil and the washing shall be diluted (to assist filtration) and
filtered through a tared Gooch crucible as noted previously. The crucible shall be washed with
filtered naptha, dried in an oven at 212°F (100°C), cooled in a desiccator, and weighed to the
nearest 0.5 mg. This 4-hour circulation, without element shall be repeated until a run shows a
removal of foreign matter from the oil not to exceed 5 mg. A sample oil filter element shall then be
installed in the standard filter body and the test oil circulated through the assembly for a period
8 hours at 30 psi inlet pressure to the filter assembly and with the oil held at a temperature of
180°F. This 8-hour circulation period shall be repeated on additional test elements until a total of
four have been flowed in the same manner, without a change or addition to the sump oil. Each
element removed from the filter assembly shall be allowed to drain back into the filter body for a
period of 5 minutes prior to starting a subsequent run. At completion of the fourth 8-hour
circulation period, the strainer and the straining body shall be cleaned as prescribed for the 4-hour
circulation periods without element and the amount of foreign matter determined to the nearest
0.5 mg. The total weight of foreign matter collected shall be divided by four and the value
reported as media migration.
4.6.2.2 Elements for type I, class 1, style B filters. To determine conformance to 3.5.2.1,
the testing shall be the same as that used in 4.6.2.1, except (a) a piece of tubing shall replace the
filter body during the system cleaning process, and (b) for each 8-hour circulation of test oil,
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