MIL-DTL-13444H
4.7.6 Burst pressure (see 3.6.3). Hose and hose assemblies shall meet the burst test specified in
ASTM D380 "straight bursting test" and shall meet the requirements of 3.6.3. The following details shall
apply:
a. The three test specimens used in elongation and contraction testing (see 4.7.4) shall be
subjected to the burst pressure test specified in ASTM D380, except as specified herein.
b. Failure of the hose specimen shall consist of leakage, rupture, or detachment from a fitting.
c. Failure of a hose assembly specimen shall consist of leakage or rupture of the hose or fitting,
leakage between hose and fitting or leakage between fitting and test fixture connector.
4.7.7 Low temperature flexibility (see 3.6.4). When exposed to low temperature the hose assemblies
shall meet the requirements of 3.6.4
a. Three 18-inch (457.20 mm) long hose and/or hose assemblies shall be selected from the
type(s) of hose being qualified.
(1) One of the three specimens shall be air aged for 168 hours at 158°F ± 2°F (70° ± 2.78°C).
(2) One shall be aged in accordance with figure 1 using hydraulic oil conforming to
MIL-PRF-87257, MIL-PRF-5606, or MIL-PRF-83282 at a temperature of 212°F ± 2°F
(100° ± 1.11°C), for a period of 70 hours.
(3) The third specimen shall remain untreated.
b. After conditioning, the 3 specimens shall be further conditioned for 70 ± 1 hours at a
temperature of -67°F ± 6°F (-55°C ± 3.33°C) for type I hose and at a temperature of -55°F ±
2°F (-48.33° ± 1.11°C) for type III hose.
c. At the end of this period, and while still at the specified temperature, all three specimens shall
be bent through 180° from the centerline over a mandrel with a diameter as specified in table
IX.
d. The specimens shall then be bent through 360° in the opposite direction over the same size
mandrel. Bending rate shall be 21° ± 2° per second.
e. The entire bending operation shall be completed within 45 seconds.
f. After bending, the specimens shall be examined to determine conformance to 3.6.4.
17
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business