MIL-DTL-8794F
4.8.16 Fuel immersion test (hose assembly) (see 3.5.13). Hose assembly when subjected to fuel
immersion test shall meet the requirements of 3.5.13. The following details shall apply:
a. A hose assembly having 9 inches (22.7 cm) of free hose between the adapters shall be
immersed in fuel conforming to ASTM D471, ASTM reference fuel B, for 72 hours at room
temperature.
b. Upon completion of this period, the assembly shall be subjected to the proof pressure
c. The test fluid used for pressure checking shall be lubricating oil conforming to SAE J1966,
grade 50, or MIL-PRF-5606, MIL-PRF-87257 or MIL-PRF-83282 hydraulic fluid.
d. The hose shall then be dissected longitudinally and visually inspected as specified in 3.5.13.
4.8.17 Lubricating oil circulation test (see 3.5.14). A hose assembly subjected to lubricating oil
circulation testing shall meet the requirements of 3.5.14. The following details shall apply:
a. The test fluid used for this test shall be lubricating oil conforming to SAE J1966, grade 50, or
hydraulic fluid in accordance with MIL-PRF-5606, MIL-PRF-87257 or MIL-PRF-83282.
b. A hose assembly smaller than size -24 shall have 9 inches (22.9 cm) of free-length hoses
between adapters. For a hose assembly of size -24 and larger, the ratio of free length hose
between adapters to the nominal hose size in inches shall be six to one. The following
sequence of steps shall be performed:
(1) The hose assembly shall be filled with test fluid while at room temperature. The hose
assembly shall remain filled for the duration of the test.
(2) The hose assembly shall be installed in a temperature-controlled box.
(3) The temperature of the ambient air shall be reduced to -40°F ± 5°F (-40°C ± 2.8°C) and
held for a minimum of 3 hours.
(4) Circulation of the fluid shall then be started at the specified operating pressure for oil in
table II at a minimum flow rate of 3 gallons per minute.
(5) A 400 psi (27.6 bar) surge pressure shall be applied for the first 30 seconds of fluid
circulation while the ambient temperature is at -40°F (-40°C).
(6) The temperature of the fluid shall then be increased within 1 hour to the specified
circulation temperature of 250°F ± 5°F (121.1°C ± 2.8°C). The ambient air temperature
shall be increased to 140°F ± 10°F (60°C ± 5.6°C).
(7) Circulation shall be continued for a minimum of 20 hours.
(8) The temperature of the fluid shall be raised to 325°F, +0, -5°F (162.8°C, +0, -5°C), for 15
minutes during the last 30 minutes of each 20-hour cycle.
(9) The ambient air temperature shall be maintained at 140°F ± 10°F (60°F ± 5.6°C).
(10) Fluid circulation shall then be stopped.
(11) Steps 1, 2, and 3 shall be accomplished a total of 10 times to obtain a minimum of 200
hours fluid circulation.
(12) Upon completion of the above test sequence, the hose assembly shall be subjected to a
minutes.
4.8.18 Volumetric expansion test (see 3.5.15) (Hose size -3, -4, and -5 only). Hose shall be
subjected to the volumetric expansion test of ASTM D380 and shall meet the requirements of 3.5.15.
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