MIL-DTL-27272C
3.6.6 High-temperature burst pressure. Fittings shall not leak, burst, or separate from the hose at any
pressure up to the applicable high temperature (450°F for class 1 fittings, 275°F for class 2 fittings) burst
pressure specified in table II (see 4.6.10).
3.6.7 Stress degradation. The effusion rate of the hose assemblies shall not be greater than the
values listed in table III when tested in accordance with 4.6.7. Following the introduction of hot oil, the
hose assembly shall not leak when subjected to the applicable proof pressure test specified in 4.6.4.
TABLE III. Effusion requirement after stress degradation test.
Size
4
5
6
8
10
12
16Z
20Z
24Z
Effusion
rate(oc/in/min)
8
8
8
4
2
2
2
2
2
3.6.8 Room-temperature burst pressure. Fittings shall not leak, burst or separate from the hose at any
pressure up to the applicable room-temperature burst pressure specified in table II (see 4.6.6).
3.6.9 Impulse. Fittings of sizes 3/4 fitting or hose through -16Z shall withstand not less than 100,000
impulse cycles at a rate of 70 pulses per minute at 125 percent of the operating pressure specified in
table II without leakage, deformation, or separation from a hose. Fittings of sizes -20Z and -24Z shall
withstand not less than 100,000 impulse cycles at a rate of 70 pulses per minute at 100 percent of the
operating pressure specified in table II without leakage, deformation, or separation from a hose (see
4.6.9).
3.6.10 Fuel resistance. Fittings shall not leak after immersion in hydrocarbon-based fuel (see 4.6.11).
3.6.11 Corrosion. The fittings shall function satisfactorily at the completion of 172 hours of cycling in
accordance with 4.6.12. After exposure to 2.5 percent sodium chloride solution, fittings shall not leak or
separate from the hose at any pressure less than the burst pressures (room-temperature and high-
temperature) specified in table II, and shall show no evidence of pitting corrosion or stress corrosion that
may adversely affect the life of the fitting (see 4.6.12.).
3.6.12 Pneumatic surge. The fitting shall not leak when operated at repeated pneumatic pressure
cycles from zero pressure to the applicable operating pressure specified in table II (see 4.6.8).
3.7 Identification of product. Fittings shall be marked for identification in accordance with the
applicable specification sheet (see 4.6.1).
3.8 Workmanship. Fittings shall be free from cracks, laps, seams, burrs, and longitudinal and spiral
tool marks that may detrimentally affect their intended use (see 4.6.1).
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as
follows:
a. Qualification inspection (see 4.2).
b. Conformance inspection (see 4.3).
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