MIL-PRF-81380E
Table IV. Qualification inspection for filter/monitor housing.
Requirement
Method
Inspection
Paragraph
Paragraph
-
-
Examination
Materials
3.2
4.5.1
Element configuration and flow rate
3.3
4.5.1
Housing configuration
3.4.1
4.5.1
Piping connections
3.4.2
4.5.1
Accessory connections
3.4.3
4.5.1
Drain valve
3.4.4
4.5.1
Pressure gage
3.4.5
4.5.1
Pressure rating
3.4.6
4.5.1
Clean-out connections
3.4.7
4.5.1
Exterior
3.4.9
4.5.1
Element spacing
3.4.8
4.5.1
Identification
3.6
4.5.1
Workmanship
3.7
4.5.1
-
-
Environmental and Post-environmental tests
High temperature test
3.5.12.1
4.5.3.1
Low temperature test
3.5.12.2
4.5.3.2
Post-environmental hydrostatic pressure test
3.5.13
4.5.4
4.2.1 Qualification inspection samples.
a. Filter/monitor element. Qualification samples shall consist of 40 elements with a nominal
length of 20 inches (50.8 cm). Five elements each of the other nominal lengths [5, 10, 15, 25, or
30 inches (12.7, 25.4, 38.1, 63.5, or 76.2 cm)] the manufacturer desires to have included on the
QPL shall also be submitted for qualification inspection.
b. Filter/monitor housing. The sample shall consist of one complete filter/monitor housing
assembly with three complete sets of elements; i.e., three elements each, of nominal length: 5 10,
15, 20, 25, and 30 inches.
4.2.2 Retention of qualification. Retention of qualification for filter/monitor elements on the
QPL shall be dependent on periodic verification, by means of test data, of continued compliance
with the requirements of this specification. This periodic verification shall be conducted every
five years from the date of inclusion on the QPL and will consist of the testing of 40 twenty-inch
elements in the same manner as an initial qualification. These qualification retention tests will
be performed by the qualifying activity (see section 6.3). Complete requalification shall be
required if any change or substitution is made in the materials or manufacturing process of the
elements. The qualifying activity may grant written waivers for minor changes in materials or
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