MIL-PRF-26626F
One cycle consists of bending the hose assembly 180o around a mandrel, also at -65o + 5oF, then
bending it 180o in the opposite direction, and then returning the hose assembly to the straight
position. The mandrel shall be 8 inches in diameter except for the -5 hose assembly, which shall
use a mandrel with a 6 inch diameter. The hose assembly shall then be subjected to the proof
pressure test (see 4.6.2).
4.6.8 Low temperature vibration. The hose assembly shall have a bend in the plane of
vibration with a radius dimensionally equal to the mandrel diameter specified in 4.6.7. With one
end of the hose assembly fixed and liquid oxygen maintained in the hose assembly, the hose
assembly shall be vibrated with a double amplitude of 0.06 inch for at least 3 hours. The
frequency shall be from 10 to 50 Hz at a constant rate. The hose assembly shall then be
subjected to the proof pressure test (see 4.6.2).
4.6.9 Odor. Gaseous oxygen shall be flowed through the hose assembly at 10 liters per
minute for 2 minutes and then the hose assembly shall be tested for odor in accordance with SAE
AS1065.
4.6.10 Cleanliness. The hose assembly shall be free of contaminants such as rust, scale,
dirt, paints, oils, hydrocarbons, and cleaning compounds. Cleanliness shall be demonstrated by
subjecting the hose assemblies to the tests specified in SAE ARP1176 or industrially accepted
test methods (see 6.2).
4.6.11 Corrosion. With the ends plugged, the hose assembly shall be subjected to the
salt fog test specified in ASTM B117 for 50 hours. The hose assembly shall be examined for
corrosion and subjected to proof pressure (see 4.6.2), burst pressure (see 4.6.3), odor (see 4.6.9),
and cleanliness tests (see 4.6.10).
4.6.12 Ozone resistance test. Samples of elastomer and inner liner materials shall be
tested in accordance with ASTM D1149 (see 6.5). The test samples shall be elongated 20%,
placed in an ozone free atmosphere for 24 hours and then subjected to an ozone environment.
The temperature shall be 100o + 5oF, an ozone concentration of 120 + 1 parts per million by
volume, and the air velocity across the sample shall be at least 2 feet per second. The material
shall be magnified for evidence of damage such as blooming, checking, or cracking as specified
in ASTM D1149.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as
specified in the contract or order (see 6.2). When packaging of materiel is to be performed by
DoD or in-house contractor personnel, these personnel need to contact the responsible packaging
activity to ascertain packaging requirements. Packaging requirements are maintained by the
Inventory Control Point's packaging activities within the Military Service or Defense Agency, or
within the military service's system commands. Packaging data retrieval is available from the
managing Military Department's or Defense Agency's automated packaging files, CD-ROM
products, or by contacting the responsible packaging activity.
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