MIL-PRF-83041C
or valved off. For conformance inspections, the time shall be reduced to 5 minutes. The initial and final
pressures shall be recorded for the pre-production item and included in the test report. In addition, the
inlet manifold or chamber (after installation) shall be blanked off and tested to 115 psig.
4.5.3 Full scale performance test. The filter separator with a full set of coalescer and separator
elements shall be tested and meet the requirements of API Bulletin 1581 (Group II, Class B) at design
flow rate of 600 gpm in accordance with API Bulletin 1581 Test Method Group II, Test Series No. 2,
except as otherwise (see 4.5.4). The maximum flow through the filter separator shall be limited to 600
±10 gpm. In addition, air introduced into the vessel shall be eliminated out through the air eliminator.
A pressure loss of 20 psi shall not be exceeded from the inlet to the outlet connection at a flow rate of
600 gpm using 0.76 specific gravity grade JP-4 or JP-5/JP-8 fuel in accordance with MIL-DTL-5624
when the elements are in new condition.
4.5.4 Inspection and testing. The inspection and testing of the first article filter separator shall be
conducted on a full-scale test system in accordance with API Bulletin 1581 and as specified herein. The
test sample shall consist of a complete filter separator with elements installed. Samples shall be
representative of a production lot.
4.5.4.1 Temperature tests. The filter separator shall meet the following temperature tests:
4.5.4.1.1 Low temperature test. Subject the filter separator to a temperature of -40°F, minimum 48
hours with relative humidity maximum 15%. Remove the filter separator from the test chamber and
within 5 minutes after removal, operate the filter separator in accordance with the full performance test
as specified in 4.5.3. The unit shall not experience any degradation in appearance or performance after
testing.
4.5.4.1.2 High temperature test. Subject the filter separator to a temperature of +125°F, minimum 48
hours with a relative humidity maximum 15%. Remove the filter separator from the test chamber and
within 5 minutes after removal, operate the filter separator in accordance with the full performance test
as specified in 4.5.3. The unit shall not experience any degradation in appearance or performance after
testing.
4.5.4.2 Humidity. The filter separator shall be subject to natural cyclic high humidity conditions that
randomly varies the temperature between 79° and 95°F with the relative humidity reaching between 85
and 95% over a 24-hour period. Immediately following the humidity cycling, without drying or
allowing the unit to dry, perform the full performance test as specified in 4.5.3. Unit shall not
experience any degradation in appearance or performance.
4.5.4.3 Altitude/air transportability test. The filter separator unit shall be constructed so that all
components will be restrained from causing any external damage in the event that applied forces of
Table I or the acceleration forces of Table II are encountered. A detailed engineering evaluation with
calculations and stress analysis on the components of the filter separator may be submitted in lieu of
actual testing. Perform the full performance test as specified in 4.5.3 with no degradation in appearance
or performance if actual testing is conducted.
4.5.4.4 Fungus resistance testing. The filter separator shall be subject to fungi and possibly abundant
growth colonization of 50% or more of the area of the control item after 14 and 28 days. The unit shall
not be cleaned for the first article for 72 hours prior to the fungus test. The unit shall not be
contaminated before or during the test by handling. Perform the full performance test as specified in
4.5.3 with no degradation in appearance or performance.
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