MIL-PRF-83772C
3.2.1 Proof pressure. The hose assembly shall withstand a proof pressure of at least 150
psi without leakage for 1 minute.
3.2.2 Burst pressure. The hose assembly shall have a burst pressure of not less than 500
psi.
3.2.3 Operation. At an ambient temperature of 70 ±10°F and a service pressure of 45 ±5
psi, the hose assembly shall be capable of being purged in 2 minutes or less and then shall be
capable of servicing liquid nitrogen through the hose and out the filler valve, as a liquid, at a
minimum rate of 1 gallon per minute (gpm).
3.2.4 Outer hose surface temperature. The outer surface temperature of the hose
assembly shall not drop below 15°F after 10 minutes of servicing with liquid nitrogen at an
ambient temperature of 70 ±10°F.
3.2.5 Tensile strength. The hose assembly shall withstand a longitudinal tensile force of
300 pounds.
3.2.6 Abrasion. The hose assembly shall be capable of being dragged on a concrete
surface for 20,000 feet without structurally damaging the hose assembly.
3.2.7 Continuity. The hose assembly shall have electrical continuity from one end
fitting, through the hose, to the other end fitting.
3.3 Recycled, recovered, or environmentally preferable materials. Recycled, recovered,
or environmentally preferable materials should be used to the maximum extent possible,
provided that the material meets or exceeds the operational and maintenance requirements, and
promotes economically advantageous life cycle costs.
3.4 Identification of product. The hose assembly shall be marked for identification as
prescribed by the authority. The marking shall be clearly readable (see 6.2). In addition to
markings required by the procuring activity, hose containers and shipping containers shall be
marked as follows:
HOSE ASSEMBLY, CRYOGENIC LIQUID, AIRCRAFT SERVICING
3.4.1 Precautionary markings. The following marking also shall be included on the hose
containers and shipping containers:
DO NOT ALLOW OIL OF ANY KIND TO BE USED ON
OR COME IN CONTACT WITH THIS HOSE
3.5 Cleaning. All parts of the hose assembly which come in contact with liquid oxygen
shall be cleaned in accordance with accepted industrial practices for breathing class oxygen
using an oxygen-safe cleaning solvent. The same batch of cleaning solvent shall be used to clean
quantities not greater than 50 hoses. Immediately following cleaning, hoses shall be dried with
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