MIL-PRF-23256C
TABLE II. Conformance inspection.
Tests
Requirement
Test method
Sample 1/
paragraph
paragraph
ALL SAMPLES
GROUP 1
Visual examination
3.5.1.1
4.5.1.1
1
Dimensional check
3.5.1.2
4.5.1.2
2
Proof pressure
3.5.2
4.5.2.1
3
Leakage
3.5.3
4.5.3
4
Operating pressure
3.5.4
4.5.4
5
Pressure drop
3.5.5
4.5.5
6
A
B
C
D
GROUP 2 2/
High temperature
3.5.6
4.5.6
1
X
1
X
Low temperature
3.5.7
4.5.7
2
X
2
X
Thermal shock
3.5.8
4.5.8
X
1
X
1
Salt fog
3.5.9
4.5.9
X
2
X
2
Humidity
3.5.10
4.5.10
X
3
X
3
Vibration
3.5.11
4.5.11
3
X
3
X
Shock
3.5.12
4.5.12
4
X
4
X
Service life, pressure 3/
3.5.13
4.5.13.1
X
4
X
X
Service life, mechanical 3/
3.5.13
4.5.13.2
X
X
X
4
Burst pressure
3.5.14
4.5.14
5
X
5
X
1/ Test sequence is denoted by the number in the sample columns. An X denotes tests are not
required.
2/ If the sample lot is greater than four, the acquiring activity shall specify test sequence for all
units exceeding four (see 6.2).
3/ If the sample lot consists of only two units, both life tests shall be performed on one unit.
4.4.3 Gas. Unless otherwise specified in the contract, the gas used for tests shall be oil-free
nitrogen, 99.95 percent pure, conforming to BB-N-411, Type I, Grade A, Class 1.
TABLE III. Lot and sample size (conformance inspection).
Lot size
Sample size
100 or less
2
101 to 300
3
301 to 500
4
501 or more
4 1/
1/ Plus 1 for each addition of 500 or fraction thereof
4.4.4 Test fixture. The test fixture shall be mated with the seal valve assembly inlet by
simulating the interface connection between the seal valve assembly and the nitrogen receiver
8
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