MIL-DTL-8794F
4.8.13 Burst pressure test (see 3.5.10). A hose assembly when subjected to burst pressure testing
in accordance with ASTM D380 shall meet the requirements of 3.5.10. The following details shall apply:
a. The hose assembly shall be subjected to the burst pressure of table II.
b. The test shall be conducted using water or hydraulic fluid as the test fluid, except that pressure
shall be applied at a rate between 15,000 psi (1034 bar) and 25,000 psi (1724 bar) per minute.
c. The hose shall not leak or burst and the adapter shall not separate from the hose at pressures up
to the burst pressure of table II.
4.8.14 Low temperature flexing (see 3.5.11). Hose assemblies when subjected to the low
temperature flexing shall meet the requirements of 3.5.11. The following details shall apply:
a. Two hose assemblies shall be subjected to the cold temperature flexing test.
b. For hose sizes -16 and larger, the hose assembled with adapters shall be 30 inches in length.
c. One assembly shall be oil-aged (see 4.7.1.2), and the other assembly shall be air-aged (see
4.7.1.3).
d. These assemblies shall be placed in a cold chamber, the temperature of which shall be -65°F,
-5°F/+0 °F (-53.9°C, -2.8°C/+0°C).
(1) Hose assemblies of size -16 and larger may be tested at -40°F (-40°C) in lieu of -65 F
(-53.9°C).
e. After this time, and while still at the specified temperature, the two assemblies shall be
removed from the cold chamber and immediately each assembly shall be flexed through 180°
to the bend radius specified in table II in approximately 4 seconds.
f. The hose assemblies shall then be subjected to the applicable hydraulic proof pressure in
accordance with 4.8.6, after removal from the cold temperature flexing test.
4.8.15 Bulge test (see 3.5.12). Hose assemblies when subjected to bulge testing shall meet the
requirements of 3.5.1.2. The hose assemblies shall be measured for bulging of the synthetic rubber tube
and resulting reduction of ID caused by the attachment of the hose to the adapter. The following details
shall apply:
a. The hose shall be conditioned in air at a temperature of 160°F ±5°F (71.1°C ±2.8°C) for a
minimum of 16 hours prior to assembly.
b. The hose and adapters shall be assembled in accordance with procedures recommended by the
adapter manufacturer for hand assembly and the bulge measured.
c. The hose assembly shall then be oil aged (see 4.7.1.2) for 7 days for qualification inspection (20 to
24 hours for conformance inspection) and the bulge again measured.
d. A ball-end-type gauge is recommended for the bulge measurement.
e. If used, the diameter of the ball type gauge shall be within .001 inch (0.03 mm) of the minimum
f. Holding the hose in a vertical position, the gauge is inserted into the end of the hose assembly at
g. The gauge must fall through the section at the end of the adapter insert under its own weight
without lubrication and without forcing the gauge through the adapter-to-hose interfacing section.
h. The weight of the gauge shall be equal in ounces to the dash number of the hose for which
21
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business