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|  MIL-O-23678B
3.3 Materials. Materials shall conform to applicable specifications and
shall be as specified herein and on applicable drawings. Materials which are
not covered by applicable specifications or which are not specifically
described herein shall be of the best quality, of the lightest practicable
weight and suitable for the purpose intended.
3.3.1 Metal arts. All metal parts shall be of a corrosion-resistant
material or treated in a manner to render them adequately resistant to
corrosion.
3.3.1.1 Dissimilar metals. Dissimilar metals, such as defined by
MIL-STD-889, shall not be used in intimate contact with each other unless
suitably protected against electrolytic corrosion with protective coatings.
3.3.2 Nonmetallic materials. Any nonmetallic material that is adversely
affected by continued use with oxygen shall not be used.
3.3.3 Protective treatment. When materials are used in the construction of
the system that are subject to deterioration when exposed to 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 requirements of this specification. Protective coating
which might crack, chip or scale during normal service life or under extremes
of environmental conditions shall not be used.
3.4 Design and construction. The design and construction of the systems
shall be in accordance with MS22059 or MS22061, as specified (see 6.2.lb).
3.4.1 Antiseize tape. Antiseize tape shall be used on al? male pipe thread
fittings. Antiseize tape shall conform to and shall be applied as specified
in MIL-T-27730. Tape shall not be used on flare tube fittings, straight
threads, coupling sleeves or on the outer side of tube flares. None of the
tape shall be allowed to enter the inside of a fitting.
3.4.2 Degreasing. Prior to assembling, all internal surfaces of the system
shall be degreased by flushing with a cleaning compound conforming to
MIL-C-81302 or by using a vapor phase degreaser in accordance with
MIL-T-81533. Components shall be cleaned by immersing, scrubbing or pressure
spraying with MIL-C-81302 cleaning compound or ultrasonics may be used in
conjunction with vapor decreasing or MIL-C-81302 cleaning compound. After
completion of the cleaning and when assembled, a General Electric Type H leak
detector or equivalent halide testing apparatus shall be used to determine the
absence of the cleaning compound.
3.4.3 Line assembly. Tubing used in the line assembly shall conform to
WW-T-775. Fittings used in the line assembly shall conform to AN780, AN800
and AN805.
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