MIL-DTL-85061C
TABLE VI. Temperature and pressure requirements.
Temperature (± 5 °F)
Fluid
Pressure (±5 psi)
Fluid and Ambient
Operating
Proof
Burst
-65 °F to +200 °F
MIL-PRF-7024
125
250
375
4.5 Inspection methods.
4.5.1 Visual examination.
4.5.1.1 Coupling. The coupling shall be visually examined to determine conformance to
this specification with respect to configuration, dimensions, weight and all the requirements not
covered by tests specified herein.
4.5.1.2 Inspection for delivery. The fully prepared shipping container containing
couplings shall be visually examined to determine that the packaging, packing and marking
conform to section 5 of this specification.
4.5.2 Proof pressure. The coupling test assembly shall be subjected to a proof pressure
of 250 PSIG at +200 °F for 5 minutes using MIL-PRF-7024 test fluid. After completion of this
test, drain the test assembly and refill with MIL-PRF-7024 test fluid and repeat proof pressure
test at 250 PSIG and -65 °F for 5 minutes. Any leakage, rupture, permanent set, permanent
deformation, or damage of any part of the test coupling shall be cause for rejection.
4.5.3 Leakage.
4.5.3.1 Vacuum leakage. The test coupling shall be free of fuel, oil, and vapor. The
coupling shall be connected with a vacuum pump to a 0.5 inch x10 ft hose or tube. A stop valve
shall be installed adjacent to the pressure gauge in line with the pump. Pressure shall be
measured within 6 inches of the coupling. A negative proof pressure of 28 inches of Hg for -4
thru -32 and 12 inches of Hg for -36 thru -96 shall be subjected to the coupling and maintained
for 15 minutes. A stop valve shall be closed and the pressure shall be monitored for 5 minutes
for leakage. The leakage shall meet the requirements specified in 3.6.3.1.
4.5.3.2 Pneumatic leakage. The test coupling shall be placed in a protective closure and
shall be proof pressure tested at room temperature for 3 minutes. The test fluid shall be dry air
or nitrogen. The test coupling shall be thoroughly clean, with no external oil or lubricant. The
coupling shall meet the requirements specified in 3.6.3.2.
4.5.4 Fuel resistance test.
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