MIL-PRF-83772C
4.4.1 Test article. The test hose assembly shall be randomly selected by an authorized
government representative from hose assemblies which have been manufactured in the same
manner that all hose assemblies to be bought per the contract will be manufactured. If the test is
successful, the remaining hose assemblies shall be included in the first lot of hose assemblies to
be delivered to the Government.
4.4.2 Cleaning test. The cleaning test shall consist of particulate test and a non-volatile
residue (NVR) test.
4.4.2.1 Particulate test. A 15-ounce sample of an acceptable oxygen-safe commercial
cleaning solvent shall be poured through the selected test sample hose assembly held vertically,
such that the interior walls are rinsed and flushed with solvent. The liquid leaving the bottom of
the hose shall be collected in a clean container and filtered by means of a vacuum pump through
a 10 micron-pore membrane filter. The filtered solvent, in its cleaned container, shall be saved
for later use in the non-volatile residue test. The particulate (metal or nonmetal) found on the
membrane filter surface shall have (1) no particle greater than 2500 microns, (2) no more than 1
particle between 700 and 2500 microns and, (3) no more than 5 particulates between 175 and
700 microns. Immediately after the rinsing of this test sample hose assembly, it shall be
thoroughly dried and its ends shall be resealed.
4.4.2.2 Non-volatile residue test. To determine the amount of NVR, the solvent used in
the particulate test (4.4.2.1) shall be dried using an evaporate process and the residue weighed
(see 6.9). The weight of the NVR shall be divided by the interior surface area of the hose
assembly and the value obtained shall be less than 0.001 grams per square foot.
4.4.3 Examination of hose. The hose assembly shall be physically inspected to ensure
the following:
a. The total length is 10 feet ±1 inch.
b. The outer diameter of the outer covering is not more than 1.25 inches.
c. The total weight does not exceed 7.20 pounds.
d. The hose assembly terminates in a 0.75 inch NPT standard female fitting having 14 tpi
at one end, and a 1 inch NPT standard male fitting with 11.5 tpi at the other end. Both end
fittings shall have a hexagonal-type outer surface.
e. The outer covering is free from sharp or frayed edges.
f. The markings are as prescribed by the procuring authority and all hoses carry the
precautionary labeling (see 6.2).
4.4.4 Bend radius test. The hose assembly shall be installed in a fixture as shown in
figure 1, and shall be rotated at a rate of at least 10 rpm for 45 minutes fifteen (15) minutes at
each of three different heights (H) of 1, 3 and 6 feet, with a liquid nitrogen flow rate of at least 1
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