MIL-DTL-25579G
3.6.5 High temperature burst pressure. When subjected to testing in accordance with 4.5.5, the hose
assembly shall not leak or burst below the applicable high temperature burst pressure specified in table III.
There shall be no leakage around the end fittings, and the end fittings shall not loosen or separate from the
hose.
3.6.6 Hose conductivity. When subjected to testing in accordance with 4.5.6, using a test potential of 1,000
V dc, hose assembly sizes -3/-4 through 8 shall conduct a direct current of not less than 6 µA. Assembly sizes
10 through 24Z shall conduct a direct current of not less than 12 µA.
3.6.7 Impulse. The hose assembly shall not leak, burst, or loosen from the test apparatus and there shall be
no evidence of malfunctioning when subjected to 100,000 cycles in accordance with 4.5.7.
3.6.8 Fuel resistance. When subjected to testing in accordance with 4.5.8, the hose assembly shall not leak
or show any evidence of deterioration during and at the completion of the test.
3.6.9 Pneumatic effusion. When subjected to testing in accordance with 4.5.9, the measured effusion rate of
the hose assembly shall not be greater than the values listed in table IV.
TABLE IV. Pneumatic effusion requirement. 1/
Size
-3/-4
-4
-5
-6
-8
-10
-12
-16Z
-20Z
-24Z
Effusion rate 2/
4.0
4.0
5.0
5.0
5.0
5.0
6.0
8.0
8.0
8.0
(cc/ft of hose)
1/ Max effusion rates
2/ Collected during the last 30 minutes of the test.
3.6.10 Pneumatic surge. When subjected to testing in accordance with 4.5.10, the hose assembly shall not
leak through the hose wall or around the end fittings. The inner tube of the hose shall not exhibit any evidence
of degradation when the filter is examined at the completion of the test.
3.6.11 Stress degradation. This test is intended to verify that the hose inner tube has been sintered and
quenched to the proper crystallinity to eliminate stress cracking or creep with subsequent leakage. The
effusion rate of the hose assembly after stress degradation shall not be greater than the values listed in table V
when tested in accordance with 4.5.11. Following the introduction of hot oil, the hose assembly shall not leak
when subjected to the applicable proof pressure test specified in 4.5.2.
TABLE V. Effusion requirement after stress degradation test. 1/
Size
-3/-4
-4
-5
-6
-8
-10
-12
-16Z
-20Z
-24Z
Effusion rate (cc3/in/min)
8
8
8
8
4
2
2
2
2
2
1/ Max effusion rates.
3.6.12 Corrosion. When subjected to testing in accordance with 4.5.12, the hose assembly shall not leak or
malfunction below the applicable room and high temperature pressures specified in table III. The fittings shall
be in good mechanical working order and shall also be free of corrosion.
3.6.13 Over-tightening torque. There shall not be any leakage when the fitting (flared or flareless only) is
subjected to testing in accordance with 4.5.13. After each disassembly, the nut shall swivel freely by hand.
3.6.14 Elongation and contraction. When subjected to the applicable operating pressure specified in table III
and tested in accordance with 4.5.14, the hose assembly shall not change length by more than +0.20 or -0.30
inch in 10 inches of length.
10
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