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MIL-P-27431B(USA
American Society for Testing of Materials
ASTM-D-3951-82 Packaging, Commercial- 29 Jan 82
(Applications for copies should be addressed to : ASTM, 1916 Race St, Philadelphia,
PA 19103).
(Industry association specifications and standards are generally available for
reference from libraries.  They are also distributed among technical groups and using
Federal agencies.)
2.3 Order of Precedence.  In the event of a conflict between the text of this
specification and the references cited herein (except for associated detail
specifications, specification sheets or MS standards), the text of this specification
shall take precedence.  Nothing in this specification, however, shall supersede
applicable laws and regulations unless a specific exemption has be obtained.
REQUIREMENTS
3.
3.1 First Article.  When specified in the contract or purchase order, a sample
shall be subjected to first article inspection (see 4.4 and 6.3).
3.2 Components.
The purging kit shall consist of the following major
components:
Item name
See requirement
a.  Heat Exchanger Assy
3.7.1
b.  Hose Assy
3.7.2
3.7.3
c.  Filler Valve
d.  Carrying Case
3.7.4
3.3 Selection of specifications and standards.  Specifications and standards for
necessary commodities and services not specified herein shall be selected in
accordance with MIL-STD-143.
3.4 Materials.
3.4.1 Protective treatment.  When materials are used in the construction of the
purging unit that are subject to deterioration when exposed to climatic and
environmental conditions likely to occur during service usage, they shall be
protected against such deterioration in a manner that will in no way prevent
compliance with the performance requirement of this specification.  The use of any
protective coating that will crack, chip, or scale with age or extremes of climatic
and environmental conditions shall be avoided.
3.4.2 Combustible materials.  Materials that are combustible, deteriorate  easily,
or are otherwise adversely affected by continued use with oxygen heated to 250F at
500 psig shall not be used in intimate contact with the flowing gas. Thermal
insulating materials shall be free from combustible bonding agents.  The purging
unit, excluding carrying case, shall be of corrosion resistant, or suitably treated,
metal construction except for electrical insulating materials, pressure seals, or
other parts where proper functioning precludes the use of metals.
3.4.3 Dissimilar metals. Unless protected against electrolytic corrosion,
dissimilar metals shall not be used In intimate contact with each other. However,
metal plating or metal spraying of dissimilar base metals to provide similar or
3

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