MIL-DTL-19328F
2.4 Order of Precedence. In the event of a conflict between the text of this document and the references cited
herein the text of this documents takes precedence. Nothing in this document, however, supersedes applicable
laws and regulations unless a specific exemption has been obtained.
3 REQUIREMENTS
3.1 Qualification. The converters furnished under this specification shall be products which are authorized by
the qualifying activity for listing on the applicable qualified products list at the time set for opening of bids (see
4.2 and 6.4).
3.2 Design and construction. The design and construction shall be in accordance with Figures 1, 2, 3, and 4.
The converter shall include provisions for filling with liquid oxygen when either installed or not installed in the
aircraft, and for being transported in the filled condition. The design of the components and associated hardware
shall be such that the assembly/disassembly of the converter can be accomplished without the use of any
specialized tools. All components and hardware shall be designed, protected, and positioned to prevent chafing
due to normal service, shipping, and handling environments. Tube assemblies and warming coils shall be a
minimum of 0.0625 of an inch (1.58 mm) from the container outer shell where practicable.
3.2.1 Major components. The major components of the converter shall be as follows:
a. Liquid oxygen container (see 3.3.1)
b. Container outer shell (3.3.2)
c. Capacity sensing element (3.3.3)
d. Electrical connectors (3.3.3.1)
e. Combination fill-buildup-vent valve (3.3.4)
f. Relief valve (3.3.5)
g. Pressure control valve (3.3.6)
h. Test port (3.3.7)
i. Overpressure safety device (3.3.8)
3.2.2 Materials. Materials that are not covered by specifications shall be suitable for use in liquid oxygen
systems. The use of reclaimed materials shall be encouraged to the maximum extent possible without jeopardizing
the function of the end item.
3.2.2.1 Metals. Metals shall be corrosion-resistant steel or nonferrous metal that has been treated to resist
corrosion. Metallic materials that are subject to corrosion in oxygen, salt air, or any other atmospheric conditions
likely to occur during the usage of the converter shall be protected against such corrosion in a manner that will not
in any way prevent compliance with the performance requirements of this specification.
3.2.2.2 Dissimilar metals. Unless suitably protected against electrolytic corrosion, dissimilar metals shall not
be used in intimate contact with each other. Dissimilar metals are defined in MIL-STD-889.
3.2.2.3 Nonmetallic materials. Nonmetallic materials shall have the physical properties required for the
converter to function without being adversely affected, while exposed to cryogenic temperatures. The contractor
shall be responsible for the evaluation of materials for their suitability in each application. The contractor may
evaluate materials in accordance with either ASTM D2512 or NASA NHB 8060.1.
3
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