MIL-DTL-22263C
4.7.4 Fuel resistance.
4.7.4.1 Phase I high temperature fuel aging. Test fluid shall be circulated through
the test assembly at the operating pressure of 125 psi and a temperature of 100°F. The fluid flow
shall be in one direction for one hour, and then reversed for a second hour. No indication of flow
restriction or blockage of the fluid through the test coupling. The fluid shall then be circulated in
one direction through the test assembly at a pressure of 125 psi and a temperature of 160 °F. The
fluid temperature shall be maintained at 160 °F for 72 hours. During the final 8 hours of this test,
the coupling assembly shall be vibrated in accordance with 4.7.8. Upon completion of this test,
the test assembly shall be proof tested at 250 psi at a temperature of 160 °F and held for a
minimum of one minute. There shall be no evidence of leakage or deformation of the coupling.
4.7.4.2 Phase II - High temperature fuel aging. Test fluid shall be circulated through
the test coupling for 72 hours while at 160 °F and 125 psi. During the final 8 hours of this
test, the test coupling shall be vibrated in accordance with 4.7.8. Upon completion, the test
assembly shall be proof tested at 250 psi and 160 °F with the pressure to be held for a minimum
of one minute. There shall be no evidence of leakage or deformation of the coupling.
4.7.4.3 Low temperature fuel aging. Test fluid shall be circulated through the test
coupling for 72 hours while at 125 psi and -65°F. During the final 8 hours of this test, the
test coupling shall be vibrated in accordance with 4.7.8. Upon completion, the test assembly
shall be proof tested at 250 psi and at -65 °F with the pressure to be held for a minimum of
one minute. There shall be no evidence of leakage or deformation of the coupling.
4.7.4.4 Air dry out. Upon completion of the low temperature fuel aging test, the
coupling assembly shall be drained and placed in an air oven for 168 hours at 160°F. The low
temperature fuel aging test of 4.7.4.3 shall be repeated upon completion of dry out.
4.7.5 Salt fog. Unless otherwise specified in the contract, the coupling assembly shall be
exposed to salt fog for 168 hours in accordance with MIL-STD-810, method 509.5. After 168
hours of exposure, the test specimen shall be examined for evidence of corrosion or other
damaged of the finish. The proof pressure test shall be performed in accordance with 4.7.2. Any
leakage or failure shall be cause for rejection of the test coupling.
4.7.6 Repeated assembly. The coupling assembly shall be tested with repeated
assembly and disassembly for 25 operations. There shall be no evidence of damage or
degradation in the connecting ability of the coupling. After the repeated assembly test, the
coupling assembly shall be subjected to the proof pressure test as specified in 4.7.2. Any leakage
or malfunction shall be cause for rejection of the coupling assembly.
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