MIL-DTL-8789F
4.9.5 Burst pressure test. Two unaged hose assemblies shall be subjected to the burst pressure
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 and record
the site of the burst.
4.9.6 Impulse test. Four hose assemblies when subjected to impulse testing in accordance with
a. Four samples of the length specified in 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 II and impulse cycles shall be
specified in table IX.
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).
TABLE IX. Impulse cycles.
Hose
Maximum impulse cycles
Minimum impulse
Minimum average
that can be used to
dash
impulse cycles 1/
cycles per hose
compute average 2/
size
4
100,000
---
---
5
100,000
---
---
6
100,000
---
---
8
75,000
100,000
150,000
10
50,000
75,000
100,000
12
35,000
50,000
70,000
16
45,000
55,000
75,000
1/ The average of the test samples shall not be below the values listed in this column.
2/ When test samples impulse cycles are averaged, the maximum cycles that may be used to
compute the average shall not exceed the figures given in this column. This column is giving a
limit to the number of impulse cycles that are allowed to calculate the average. While testing is
in progress the test operator will take a reading of the impulse cycles completed. If it's higher
than the value in column 4, the test operator would use the value specified in the table not the
higher (true) value from the reading.
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