MIL-DTL-26633E
3.3 Design and construction. The hose shall be constructed to meet the requirements specified
herein and to retain the end fittings without slipping or leaking when tested as specified. The hose
assembly shall be designed for a 99.5 percent purity gaseous oxygen working pressure of 3,000 psig
(206.84 bar) and a minimum hydrostatic burst pressure of 12,000 psig (827.37 bar).
3.3.1 Hose construction. The oxygen hoses in this specification shall be non-conductive.
3.3.1.1 Hose. The hose shall consist of a PTFE tube, reinforcement, and outer cover.
3.3.1.2 PTFE inner tube. The PTFE inner tube shall be a seamless, uniform gage extrusion of virgin
polytetrafluoroethylene resin (PTFE). It shall be compounded and processed to permit the least amount
of effusion of compressed gases consistent with the requirements specified herein. The PTFE inner tube
shall have a smooth bore, shall be free from pitting and other defects, and shall be cleaned to be free of
dirt, foreign material, or mandrel lubricants. The tube shall be non-conductive and shall not contain
carbon black. Carbon black can support combustion or explosion in an oxygen atmosphere; particularly
in a "shock" condition.
3.3.1.3 Reinforcement. The reinforcement shall consist of one or more spirally wrapped or braided
(or combination thereof) plies of stainless steel wires. Reinforcement separation materials, if used, shall
permit gas effusion from the PTFE inner tube to escape to the atmosphere. There shall be no broken or
spliced reinforcing wires nor shall any wires be omitted in any length of hose.
3.3.1.4 Outer cover. A cover at least .029 inch (0.74 mm) thick shall be furnished on the outside of
the hose. The cover shall consist of an abrasion, oil, and ozone-resistant chloroprene polymer or
equivalent synthetic material compound to meet the requirements specified herein. The cover need not
be bonded to the outermost reinforcement ply, but shall not be free to slip or turn along the length of the
hose. The cover shall permit gas that may effuse from the PTFE inner tube to escape to the atmosphere.
3.3.2 Dimensions and configuration.
3.3.2.1 Diameter. The inside and outside diameters of the hose shall be within the limits shown on
figure 1.
3.3.2.2 Length. The hose assembly shall be furnished in lengths as specified by the procuring
activity. The hose shall be measured as shown on figure 1.
3.3.2.3 End fittings. The end fittings shall conform to MS28760 (general configuration), and shall be
made of stainless steel (socket material may be aluminum in accordance with MIL-DTL-8789), and shall
mate with -5 fitting in accordance with SAE-AS4395. The swivel nut dimensions across flats shall
conform to AN818 size -5. Provisions for wrenching by a hex or flats on the fitting body shall be optional.
The nipple bore diameter shall conform to the limits shown on figure 1. The end fittings shall be designed
for a working pressure of 3,000 psig (206.84 bar) and a minimum burst pressure of 16,000 psig (1103
bar). The end fittings shall be retained on the assembly without slipping or leaking when coupled to the
hose and tested as specified.
3.3.2.3.1 Finish.
3.3.2.3.1.1 Corrosion resistant steel. Corrosion resistant steel shall be passivated in accordance with
SAE-AMS2700.
3.3.2.3.1.2 Aluminum alloy. Anodic treatment, in accordance with MIL-A-8625, type II.
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