MIL-PRF-83860D
difference in weight between the filter membrane before and after this procedure is the weight of
contaminant passing through the filter element and is the contaminant value (B) in equation 1.
4.6.4.3 Add value (A). A free-flow dummy element shall be installed in a test filter
housing and the procedure in 4.6.4.2 shall be repeated four times. The add value (A) in equation
1 is the average of the weights of contaminant collected in the four runs. The weight of the
contaminant collected in each of the four runs shall be 95% or more of the weight of the
contaminant added.
4.6.4.4 Blank value (C). The filter element shall be installed in a test filter housing and,
with no contaminant added, the procedure in 4.6.4.2 shall be repeated. The weight of
contaminant is the blank value (C) in equation 1. The blank value is the weight of contaminant
attributed to the test system and the filter element and shall be less then 0.0007 gram.
4.6.4.5 Multi-pass efficiency testing. If required, multi-pass efficiency testing, in
accordance with ISO16889:2008, 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 build-up and collapse. The filter element with the highest initial bubble
point shall be installed in a test filter housing and placed on a test system (see figure 7) filled
with a 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
incremental amounts specified in table I at four minutes 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 add 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 shall not exceed SAE-AS4059, Class 4. 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 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
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