MIL-PRF-83772C
gpm. The hose shall neither rupture nor leak as a result of this test, nor shall it develop sharp or
frayed edges that would be dangerous in operational use. The integrity of the hose shall be
verified after the test by pneumatically pressurizing the hose to 150 ±5 psig and then submerging
the hose in water. There shall be no steady stream of air bubbles evidencing leakage from the
hose assembly.
4.4.4.1 Alternate bend radius test. When specified by the procuring authority as an
alternate to paragraph 4.4.4, the hose assembly shall be attached to a solid support, stretched out
straight, and the hose shall have liquid nitrogen pumped through it at a rate of at least 1 gpm for
15 minutes. After the 15 minutes, the flow of liquid nitrogen shall be turned off.
a. Within two minutes, the hose shall be completely coiled around a 10 inch square
mandrel and then it shall be uncoiled and straightened out.
b. Liquid nitrogen shall be pumped through the hose at a rate of 1 gpm, or more, for at
least 1 minute. After this minute, turn off the liquid nitrogen source. Repeat steps a and b above a
total of 100 times; 50 times coiling clockwise; then 50 times coiling counterclockwise.
Following the completion of the 100 coils, hose assembly integrity shall be verified by
pneumatically pressurizing the hose to 150 ±5 psig, and then submerging the hose in water.
There shall be no steady stream of air bubbles evidencing leakage from the hose assembly.
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