MIL-PRF-83861D
4.6.4.5 Multi-pass efficiency testing. If required, multi-pass efficiency testing, in
accordance with ISO 16889, will be performed (see 6.2 and 6.3.1).
4.6.5 Maximum particle passed. The maximum particle passed is determined by
following the procedure in 4.6.4.2 using the add value of carbonyl iron E contaminant specified
in table I. The element with the lowest initial bubble point shall be used in this test. The largest
carbonyl iron E particle size passed shall be no greater than the value specified in table I.
4.6.6 Pressure buildup and collapse. The filter element with the highest initial bubble
point shall be installed in a test filter housing and placed in a test system (see figure 6) filled with
test fluid pre-cleaned in accordance with 4.4.1.1. The rated flow shown in table I shall be
maintained during this test. The clean-up filter shall be by-passed during this test. The pressure
drop across the clean element shall be measured to verify that the clean element pressure drop
does not exceed the value in table I. Add AC dust, in slurry, through the dust valve in the
incremental amounts specified in table I at four minute intervals. The dust valve shall be
completely open within the first five seconds of each four minute interval. A 100 mL sample of
contaminated test fluid shall be collected, after passing through the filter element, during a 60
second period of each four minute interval. The sampling period shall begin 10 seconds prior to
each contaminant add and continue for 60 seconds. When the minimum AC dust in table I is
added, the element pressure drop in table I shall not be exceeded. Sampling shall be performed
for each contaminant added until the differential pressure across the filter element reaches 150
psi. Count all particles in the following micron ranges: 5-15, 15-25, 25-50, 50-100, and greater
than 100. The particle counts for 5 micron filter elements shall not exceed SAE-AS4059, Class 4.
The particle counts for 15 micron filter elements shall not exceed SAE-AS4059, Class 8.
Additional AC dust shall be added until the minimum collapse pressure in table I is obtained.
The minimum collapse pressure shall be imposed two times and held for two minutes each time.
There shall be no sign of structural failure indicated through a visual inspection and the bubble
point test in 4.6.2.2. For elements loaded to a differential pressure of 4,500 psi, the elements shall
be subjected to the bubble point test in 4.6.2.2 after the elements have been loaded to a
differential pressure of 3,000 psi.
4.6.7 Flow fatigue. The filter element shall be installed in a non-bypass type test filter
housing, placed in a test system, and subjected to fatigue cycles with the test fluid at table I
temperature and flow rate. The cycling rate and the number of fatigue cycles at each differential
pressure are specified in table I. There shall be no evidence of damage as indicated by
performing the bubble point test in 4.6.2.2.
4.6.8 Abrasion migration. Abrasion migration is computed using the following equation:
X = A-C
(2)
where: X = Abrasion migration
A = Analysis value (weight) of abrasion material with filter element and vibration
C = Blank value (weight) of abrasion material with a dummy filter element and
without vibration
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