MIL-DTL-8790F
4.9.4 Leakage test. Two unaged hose samples shall be tested as specified in ASTM D380 and meet the
requirements of 3.7.3. The following details shall apply:
a. The samples shall be a minimum of 12 inches (30.5 cm) in length.
b. Test fluid shall be water or hydraulic fluid in accordance with MIL-PRF-5606, MIL-PRF-83282 or
MIL-PRF-87257.
b. Samples shall be subjected to 70% of the minimum burst value specified in table I and held for 5
minutes.
c. After 5 minutes, the pressure shall be released and reduced to zero. Then the pressure shall be
raised again to 70% of the minimum burst pressure and held for another 5 minutes.
d. The adjacent outer cover shall be carefully inspected during this period for any wicking or
leakage of the test fluid.
e. After completion of the leakage test on these samples, they shall be subjected to the burst
resistance test specified in 4.9.5.
4.9.5 Burst pressure test. Two unaged hose assembly samples shall be subjected to the burst
pressure specified in table I and shall meet the requirements of 3.7.4. The following details shall apply:
a. The assemblies shall be a minimum of 12 inches (30.5 cm) in length.
b. During this test, the hose assembly shall be fastened at one end to the source of pressure, the
hose shall be extended straight, and the free end shall not be restrained or fastened in any
way.
c. Test fluid shall be water or hydraulic fluid in accordance with MIL-PRF 5606, MIL-PRF-83282
or MIL-PRF-87257.
d. The rate of pressure rise shall be 25,000 +0/-10,000 psi per minute (1723.7 bar +0/-689.5 bar
per minute).
e. Pressure shall be applied until failure occurs.
f. The actual pressure at which the samples burst or otherwise fail shall be recorded.
4.9.6 Impulse test. Hose assemblies when subjected to impulse testing in accordance with
SAE-ARP603 shall meet the requirements of 3.7.5. The following details shall apply:
a. Four samples of the length specified in table I shall be subjected to the proof pressure test
(see 4.9.3), prior to impulsing.
b. Two of the four samples shall be air aged and the other two shall be oil aged.
c. Operating pressure for impulse testing shall be specified in table I and impulse cycles shall be
specified in table VI.
d. Only hose size 16 shall be tested without surge peaks and in a straight position with one end
free.
e. Test fluid shall conform to MIL-PRF-5606, MIL-PRF-83282 or MIL-PRF-87257, except that up
to 25% of the total volume may be fluid in accordance with SAE-J1966, grade 50.
f. The fluid temperature, measured in the manifold, shall be held at 120°F ± 20° F(48.9°C
±11.1°C).
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