MIL-DTL-25579G
4.5.4 Room temperature burst pressure. Samples shall be subjected to testing in accordance with
SAE-AS2078 using the applicable room temperature burst pressure specified in table III. Test fluid shall be
water or fluid in accordance with MIL-PRF-5606, MIL-PRF-83282, or MIL-PRF-87257. Samples shall be
continuously observed throughout the duration of the test. The type of failure and the pressure at which failure
occurred shall be recorded. Conformance shall be as specified in 3.6.4.
4.5.5 High temperature burst pressure. Samples shall be subjected to testing in accordance with
SAE-AS2078 using the applicable high temperature pressure specified in table III. Test fluid shall conform to
MIL-PRF-7808, MIL-PRF-83282, or MIL-PRF-87257. Samples shall be continuously observed for the duration
of the test. The type of failure and the pressure at which failure occurred shall be recorded. Conformance shall
be as specified in 3.6.5.
4.5.6 Hose conductivity. The test sample shall be a 13-inch (330 mm) length of hose with a fitting attached
at only one end. Testing shall be in accordance with the conductivity test for hose assembly specified in
SAE-AS2078. Conformance shall be as specified in 3.6.6.
4.5.7 Impulse (see 3.6.7). Hose assemblies when subjected to impuse testing shall meet the requirements
of 3.6.7, the following details shall apply:
a. All test specimens, of length as specified in table III, shall be subjected to the proof pressure test (see
4.5.2) prior to impulse testing in accordance with SAE-AS2078.
b. For qualification testing, 2 of the 6 samples shall be unaged while 2 samples shall be aged in air at
400°F ±10°F (204°C ±5.5°C) for 168 hours. The remaining 2 samples shall be aged by immersion in
fluid in accordance with MIL-PRF-7808 at 400°F ±10°F (204°C ±5.5°C) for 168 hours.
(1) The assemblies shall then be subjected at room temperature to the proof pressure specified in
table III for a minimum of 5 minutes.
(2) The hose assemblies shall then be pressurized to operating pressure and while maintaining
this pressure at room temperature, the hose assemblies shall be immersed in a 3.5% +0.1%
U.S.P. Grade NaCI solution by weight for 8 to 10 minutes, then allow to air dry for the remainder
of 1 hour. This sequence of immersion and air drying shall be repeated no less than 50 times.
c. Samples sizes 12 and smaller shall be connected to the rigid supports of the test apparatus and bent
to the applicable radius specified in table III. Samples sizes -16Z and larger shall be installed
straight; one end may be left free.
d. The peak pressure used for samples shall be 100% of operating pressure specified in table III.
4.5.8 Fuel resistance (see 3.6.8). Samples shall be subjected to the fuel resistance test in accordance with
SAE-AS2078 shall meet the requirements of 3.6.8.
4.5.9 Pneumatic effusion (see 3.6.9). Samples shall be subjected to the pneumatic effusion test in
accordance with SAE-AS2078 shall meet the requirements of 3.6.9.
4.5.10 Pneumatic surge (see 3.6.10). Samples shall be subjected to the pneumatic surge test in accordance
with SAE-AS2078 shall meet the requirements of 3.6.10.
4.5.11 Stress degradation (see 3.6.11). Hose assemblies when stress degradation tested shall meet the
requirements of 3.6.11, the following details shall apply:
a. Two hose assemblies of each size shall be subjected to this test. The hose assemblies shall be filled
with high temperature test fluid in accordance with MIL-PRF-7808 or MIL-PRF-83282.
b. The hose assemblies shall then be placed in an oven which shall be maintained at a
temperature of 450°F ±10°F (232°C ±5.5°C). Precautions shall be taken to assure that the hose
assemblies do not come in contact with part of the oven that are at a higher temperature. A
assemblies.
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