MIL-PRF-62410B(AT)
4.7.12 Burst pressure. To determine conformance to 3.4.3, a test shall be performed
immediately after the proof pressure test of 4.7.11. Connect the tube assembly to a pressure
supply unit (see 4.7.4.c). Utilizing an appropriately sized fitting (see MS33514), tighten the
connecting nuts of the assembly. Fill the tube assembly with test fluid and cap the open end after
all air is removed. Pressurize at one-third of rated pressure increase per minute for a 5-minute
period while monitoring the assembly from behind a protective enclosure. There shall be no
evidence of external leakage or rupture at any pressure below the specified minimum burst
pressure. Assemblies used for verification of compliance to the burst pressure requirements shall
be indelibly marked to prevent their use in functional systems.
4.7.13 Endurance. To determine conformance to 3.4.4, connect the tube assembly. Then
connect the assembly to a high pressure impulse energy drive and subject it to 200,000 dynamic
pressure impulse cycles at the pressures and rates specified in 3.4.4 and Figure 3. At the
conclusion of impulse cycling, the assembly shall be subjected to the proof pressure test
(see 4.7.11) and examined for leakage or failure. Any evidence of leakage or failure shall be
cause for rejection.
4.7.14 Hydrostatic pressure resistance. The determination of the hydrostatic pressure
shall be as specified according to the formula in 3.4.5. The tubing shall be examined for bulging,
leakage, and other defects or failures, except that any diametric permanent set shall be
disregarded.
4.7.15 Repeated assembly. To determine conformance to 3.4.6 and 3.4.6.1, attach a non-
lubricated mating fitting to each end of the tube assembly being tested. Tighten the connecting
nut, then loosen the connecting nut and rotate the tube 90 degrees and retighten the connecting
nut in the same manner. Repeat this procedure for eight cycles after which the assembly shall be
subjected to the proof pressure test (see 4.7.11) and then the burst pressure test (see 4.7.12).
Assemblies used for verification of compliance to the endurance requirements shall be indelibly
marked to prevent their use in functional systems.
4.8 Environmental tests.
4.8.1 Environmental test conditions. Unless otherwise specified (see 6.2), conditions for
environmental tests shall be as follows:
a. Assemblies undergoing initial production shall be subject to performance test
(see Table V) prior to, during (when required in test method), and immediately
following each environmental test.
b. Assemblies undergoing acceptance tests shall have passed all acceptance tests
specified in Table V prior to environmental test. Tests shall be as specified herein.
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