MIL-PRF-87961B
6.4 Construction. Previous versions utilized 0.072 inch diameter aluminum wire,
conforming to ASTM-B21 and SAE-AMS-QQ-A-225, left hand helical wound to 0.170 to 0.185
pitch. The inner layer had polyethylene (0.003 inch) tightly wrapped over itself to form 6 plies.
The vinyl outer layer (0.005 inch) was tightly wrapped over itself to form 2 plies.
6.5 Cleaning. See MIL-STD-1330 and SAE-ARP1176 for guidance on proven cleaning
methods and verifications. Visible inspections are typically conducted using white light and
ultraviolet light to detect particulates and some types of hydrocarbons. The non-volatile residue
test in SAE-ARP1176 may be use to baseline the hydrocarbon verification at an acceptable
contamination level, however, other cleaning and verification methods that do not contain class I
and II ODC solvents should be used for production. Previously, hoses were 75% filled wit 160oF
distilled water and both ends sealed. After being shaken for a minimum of 2 minutes, the water
was poured into a clean glass container. The solution was not allowed to be more turbid than a
standard suspension of 5 milligrams of diatomaceous silica in 10 millimeters of distilled water.
6.6 Abrasion testing. Previous procurements used a United States Testing Company
model 8675 abrasion tester with 4 hose test specimens 6.5 inches long. The 4 sections of hose
were obtained by cutting through the hose perpendicular to its longitudinal axis.
6.7 Sampling inspection. In previous acquisitions, hose offered for delivery at one time
were considered a lot, and random samples where selected from each lot in accordance with
inspection level S-2 in accordance with MIL-STD-1916.
6.8 Delamination testing. Previously, the delamination test used an end cap with a
viewing window at one end and a vacuum source with a light at the other end. While under a
vacuum, the interior of the hose was examined for evidence of delamination. A test stand
equivalent to MS22057 was used.
6.9 Definitions.
a. Burst pressure. The burst pressure is the greatest applied internal pressure to which
the hose can be subjected to before ultimate strength is exceeded.
b. Health hazards. Materials such as cadmium, lead, and polyvinyl chloride can be
susceptible to outgasing in the presence of pure oxygen and at elevated temperatures. Outgasing
by these and many other materials when used in breathing oxygen equipment can cause potential
health hazards.
c. Hose and hose assembly. The hose consists of the basic hose, integral reinforcement,
end covers and outer covering. The hose assembly may have MS22058 connectors with MS
22064 clamps and retainer straps. Previous hoses used outer coverings made from tubular
polyamide or polyester material of knitted or braided construction.
d. Permanent set. A permanent change in the physical shape of the hose after all forces
have been removed.
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