MIL-DTL-13531J
4.8.5 Burst pressure (see 3.6.3). Test hose specimens used previously for the length change test in
4.8.4 shall be subjected to the burst pressure test specified in ASTM D380 and shall meet the
requirements of 3.6.3. The following details shall apply:
a. Pressure shall be increased until each specimen fails.
b. Failure of the hose specimen shall consist of leakage, rupture, or detachment from a fitting.
c. Failure of a hose assembly specimen shall consist of leakage or rupture of the hose or fitting,
leakage between hose and fitting or leakage between fitting and test fixture connector.
4.8.6 Low temperature flexibility (see 3.6.4). Hose assemblies when subjected to the low
temperature flexibility in accordance with ASTM D380 shall meet the requirements of 3.6.4. The
following details shall apply:
a. Test specimens shall consist of three hose assemblies.
b. Two specimens shall be selected from those previously conditioned in accordance with 4.5.1.1
and one specimen shall be unconditioned.
c. The three specimens shall be subjected to the low temperature test for complete hose in
accordance with ASTM D380, except as specified herein.
d. To determine conformance to 3.6.4, test specimens and test fixture shall be temperature
conditioned for not less than 70 hours at -67°F ± 5°F (-55 ±2.78°C) ambient air temperature.
e. The test shall then be conducted at the same temperature. Each specimen shall be examined
during and after test to determine conformance to 3.6.4.
f. After the low temperature flexibility tests the specimens shall be subjected to the proof pressure
4.8.7 Proof pressure (see 3.6.5). Bulk hose and hose assemblies when subjected to the proof
pressure test in accordance with ASTM D380 shall meet the requirements of 3.6.5. The following details
shall apply:
a. Each bulk hose length and each hose assembly shall be subjected to this test.
b. Proof pressures shall be as specified in table II for the type and size tested.
4.8.8 Oil resistance (see 3.6.6). Bulk hose when subjected to the oil resistance test in accordance
with ASTM D380 shall meet the requirements of 3.6.6. The following details shall apply:
a. Three specimens shall be taken from the outer cover of untested hose, and three specimens
shall be taken from the inner tube of untested hose.
b. Each specimen shall be approximately 2 square inches in area.
c. Hydraulic fluids shall be in accordance with MIL-PRF-5606, MIL-PRF-6083 and
MIL-PRF-83282.
d. Each specimen shall be immersed in the hydraulic fluid. The temperature shall be +158°F
±3.6°F (70°C ±2°C) for 168 ±.5 hours.
e. The change in volume reported for the outer cover shall be the average of the values obtained
from the three outer cover specimens tested.
f. The change in volume of the inner tube shall be the average of the values obtained from the
three inner tube specimens tested.
g. The change in volume of the outer cover and inner tube shall each be calculated to determine
conformance to 3.6.6.
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