MIL-DTL-27272C
4.6.9 Impulse. All test samples, of length as specified in table II, shall be subjected to the proof
pressure test prior to testing in accordance with SAE AS2078 (see 4.6.4). For qualification testing, 2 of
the 6 samples shall be unaged while 2 samples shall be aged in air at 400 ±10°F for 168 hours. The
remaining 2 shall be aged by immersion in fluid conforming to MIL-PRF-7808 at 400 ±10°F for 168 hours.
Samples sizes 12 and smaller shall be connected to the rigid supports of the test apparatus and bent to
the applicable bend radius specified in table II. Samples sizes 16Z and larger shall be installed straight,
one end may be left free. The peak pressure used for samples sizes 4 through 16Z shall be 125% of the
operating pressure specified in table II. For sizes 20Z and 24Z, the peak pressure shall be equal to but
not greater than the operating pressure. Conformance shall be as specified in 3.6.9.
4.6.10 High-temperature burst pressure. The hose assembly shall be subjected to the high-
temperature burst pressure test in accordance with SAE AS2078. The test fluid shall be either
MIL-PRF-7808 or MIL-PRF-83282. The ambient and fluid temperature shall be 450±10°F for class 1
fittings. The applicable high-temperature burst pressure shall be as specified in table II. The fittings shall
not leak, burst, or separate from the hose at a pressure less than the specified high-temperature burst
pressure (see 3.6.6).
4.6.11 Fuel resistance. The hose assembly shall be subjected to testing in accordance with
SAE AS2078. The test fluid shall be fuel conforming to ASTM D471 (see Reference Fuel B). The
applicable operating pressure shall be as shown in table II. The fittings shall show no evidence of
leakage or separation from the hose (see 3.6.10).
4.6.12 Corrosion. Two hose assemblies shall be mounted in a vertical position and immersed in a
2.5% solution of sodium chloride (NaCl) for 5 minutes. The samples shall then be air dried at 140°F for
25 minutes. This cycling shall be continued for 172 hours with the hose pressurized to normal applicable
operating pressure of table II. Following the cycling, one hose assembly shall be subjected to the room-
temperature burst pressure test of 4.6.6 and the other shall be subjected to the high-temperature burst
pressure test of 4.610. The fittings shall show no evidence of leakage or separation from the hose up to
the respective burst pressures, or any pitting corrosion or stress corrosion that may adversely affect the
life of the fitting (see 3.6.11).
4.6.13 Over-tightening torque. The over-tightening torque test shall be conducted in accordance with
SAE ARP908. Two flared-type fittings shall be assembled on an SAE AS4395 fitting end of steel
construction. The threads of the SAE AS4395 fittings shall be lubricated with fluid conforming to MIL-
PRF-5606 or MIL-PRF-83282 prior to this test. The fittings shall be tightened to the applicable over-
tightening torque values specified in SAE ARP908 and then loosened. This sequence shall be repeated
15 times. After this sequence, there shall be no evidence of failure or deformation of the fittings, and the
swivel nuts shall be free to turn by hand, following disassembly. This test shall also be applied to two
flareless-type fittings by assembling them on an SAE AS33514 fitting end of steel construction. The test
sequence and torque values for the flareless fittings are the same as specified above for the flared-type
fittings (see 3.6.3).
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the
contract or order (see 6.2). When actual packaging of materiel is to be performed by DoD personnel,
these personnel need to contact the responsible packaging activity to ascertain requisite packaging
requirements. Packaging requirements are maintained by the Inventory Control Point's packaging activity
within the Military Department or Defense Agency, or within the Military Department's Systems
Command. Packaging data retrieval is available from the managing Military Department or Defense
Agency automated packaging files, CD-ROM products, or by contacting the responsible packaging
activity.
13
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business