MIL-DTL-22263C
b. Sampling inspection (see 4.6).
4.5 Individual inspection. Each coupling shall be visually examined to determine that
the coupling complies with the requirements specified in 4.7.1. Any coupling failing to pass the
examination shall be rejected.
4.6 Sampling inspection. The sample size shall be selected in accordance with
ANSI/ASQ Z1.4 inspection level I, acceptable quality level (AQL) as specified in the contract
and shall pass the tests listed in table VII except to be performed at room temperature. If the
sample fails to pass this test, the lot represented by this sample shall be rejected. The tested
coupling shall be discarded.
TABLE VII. Sampling inspection.
Test description
Design
Test
requirements
requirements
Proof pressure
3.7.2
4.7.2
Repeated assembly
3.7.6
4.7.6
4.7 Inspection methods.
4.7.1 Examination of product. The coupling shall be examined to determine conformance to
this specification with respect to configuration, dimensions and weight and all the requirements not
covered by tests specified herein.
4.7.2. Proof pressure. The test assembly shall be subjected to a proof pressure specified in
3.7.2 for a period of 5 minutes. Any rupture, permanent set, permanent deformation or damage of
any part of the test coupling shall be cause for rejection.
4.7.3 Leakage.
4.7.3.1 Vacuum leakage. The test coupling shall be free of fuel, oil and vapor. The
coupling shall be connected with vacuum pump with hose or tube having OD 0.5 inch and length
10 ft. A stop valve shall be installed adjacent to the pressure gauge in line with the pump.
Pressure shall be measured within 6 inches of the coupling. A negative proof pressure of 28
inches of Hg (14 psi) for sizes -4 through -32 and 12 inches of Hg (6 psi) for sizes -36 through
-96 shall be subjected to the coupling and maintain for 15 minutes. A stop valve shall be closed
and the pressure shall be monitored for 5 minutes for leakage. The leakage requirements
specified in 3.7.3.1 shall be met.
4.7.3.2 Pneumatic leakage. The test coupling shall be thoroughly clean with no external
oil or lubricant. The test fluid shall be dry air or nitrogen. The test coupling shall be placed in a
protective closure and shall be proof pressure tested at room temperature for 3 minutes. The
coupling shall meet the requirement specified in 3.7.3.2.
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