MIL-DTL-27267D
FIGURE 1. Test setup for pneumatic effusion tests.
i. This test setup with the hose assembly installed shall be immersed in water containing no wetting
agent. A pressure equivalent to the rated operating pressure, as specified in table III, shall be
applied and the pressure shall be held for a minimum of 15 minutes to allow any entrapped air in
the hose assembly to escape.
j. A pressure equivalent to the rated operating pressure specified in table III shall be applied and
the pressure shall be held for a minimum of 5 minutes and then released. This shall be repeated
for a total of 10 times between each pressure application and with the samples still in the -
67º±2ºF (-55°C ±1.1°C) cold chamber.
k. The pressure shall be held for an additional 5 minute period. During this time effused gas shall
be collected from the test sample which includes the juncture of the hose to the fitting, but not
including the fitting nut. If after the 5 minute period of pressurization, the average rate of
effusion through the hose assembly exceeds the values listed in table IV, it shall be cause for
rejection.
l. At the completion of the tests specified in 4.6.3.5 (b) through (j), the hose assemblies shall be
filled with oil and placed in a cold chamber for 8 hours while maintained at -67°F ± 2°F (-55°C
±1.1°C).
m. After the 8 hour cold soak, the assemblies shall be subjected to a pressure equal to the
operating pressure specified in table III. The pressure shall be held for a minimum of 5 minutes
between each pressure application and with the samples still in the -67°F ±2°F (-55°C ±1.1°C)
cold chamber.
n. At the end of this time oil at a temperature of 450°F ±10°F (232°F ±5.5°C) shall be circulated
through the hose assemblies.
o. Within 15 seconds after introduction of the hot oil, the pressure shall be increased to the rated
proof pressure specified in table III and held for 2 minutes. There shall be no evidence of
leakage from the hose.
4.6.3.6 Room temperature burst pressure. Samples shall be tested in accordance with
SAE-AS2078. The test fluid shall be water or fluid conforming to MIL-PRF-5606, MIL-PRF-83282, or
MIL-PRF-87257. The samples shall be observed throughout the test. The type of failure and the
pressure at which failure occurred shall be recorded. Conformance shall be as specified in 3.5.3.6.
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