MIL-PRF-25369D
e.
Type of cylinder and threading required, and procedures for verifying compliance
(see 1.2 and 3.5.2).
f.
Whether the cyclic leakage test will be conducted (see 4.7.7).
g.
Rejection criteria for tests specified in section 4, if different from requirements
specified in section 3.
6.3
Suggested equipment for rupture test. A perforated, 3/8-inch thick, steel container with a
bolted top should be used for holding the carbon dioxide cylinder during heating. A can of
SternoTM brand fuel or similar is suggested as a heating mechanism.
6.4
First article reports and test samples for Navy procurement. First article inspection
reports and samples for procurement for the Naval Air Systems Command should be forwarded to
the Air Crew Equipment Laboratory, Naval Air Engineering Center, Philadelphia PA.
6.5
Marking Methods. The tables in MIL-STD-130, "Marking Methods" and "Criteria in
Selection of Marking Methods", provide guidance for identification marking.
6.6
Threading of cylinders. FED-STD-H28/30 and ANSI/ASME B1.3M show different
methods for thread conformance. Gages should meet requirements of FED-STD-H28/6,
ANSI/ASME B1.2, and FED-STD-28/20; new or more effective methods are acceptable.
6.7
Purity. One of two methods may be used for testing: (a) gas chromatography, or (b)
Orsat (volumetric) analyzer or equivalent with a capability of determining the purity with an
accuracy of at least 0.1 percent. The carbon dioxide will be drawn from the vapor phase of the
container. The carbon dioxide container and its contents will be at a temperature between 70 and
75 ºF. At least 90 percent by weight of the original contents will remain in the container after
determining the percentage of carbon dioxide. The percentage of carbon dioxide will be
calculated by volume. Purity of the non-medicinal carbon dioxide not as specified in Table 1 will
indicate failure of this test.
6.8
Moisture content. The moisture content of non-medicinal carbon dioxide can be
determined by one of four methods: (a) the accelerated gravimetric method (see 6.9.1), (b) the
dewpoint (frost) method, (c) the electrolytic hygrometer method, or (d) the electrical conductivity
method. The carbon dioxide sample will be drawn from the container as a liquid. Vapor phase
samples will be conditioned either as described in 6.9.1 or by vaporization within a sampling
cylinder before being admitted to the test apparatus. The conditioning procedure will ensure that
all of the water present goes into the vapor phase with the carbon dioxide. If vaporized in a
sampling cylinder, the sample quantity should not be more than 10 percent of the normal capacity
of the sampling cylinder. The sampling cylinder may be gradually heated to evaporate water
condensed during the liquid carbon dioxide vaporization. Non-medicinal carbon dioxide
containing more than 0.092 milligrams of water per liter of gas, at 760 mm of mercury and 70 ºF,
will indicate failure of this test.
9
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