MIL-PRF-27415C
3.4 Filled containers (Type I only).
3.4.1 Pressure. The container filling pressure (see 6.2) shall not differ from that required by the
contract by more than 1.0% at 21°C (70°F) when tested as specified in 4.5.1. In no case shall the filling
pressure exceed the rated service pressure of the container.
3.4.2 Leakage. Cylinders shall not leak when tested according to 4.5.2.
3.4.3 Inspection and maintenance. Compressed gas cylinders shall be inspected, maintained,
and charged according to 4.5.3.
TABLE I. Limits for argon
Test
Composition
Grade
Paragraph
A
B
Purity, % by volume, min
99.998
99.985
4.4.1
Impurities
Water, ppm by volume, max
3.5
23
4.4.2
Dewpoint, °C (°F)
-68 (-90)
-54 (-65)
4.4.2
Oxygen, ppm by volume, max
2
50
4.4.2
Hydrogen, ppm by volume, max
2
50
4.4.2
Nitrogen, ppm by volume, max
10
50
4.4.2
Total hydrocarbons (as methane),
0.5
Not specified
4.4.2
ppm by volume, max
Carbon dioxide, ppm by volume, max
0.5
Not specified
4.4.2
4.
VERIFICATION
4.1 Points of inspection (see 6.2).
4.1.1 Containers. Unless otherwise specified, acceptance tests shall be conducted at the site of
filling prior to shipment or departure.
4.2 Conformance inspection. Quality conformance tests shall consist of the following:
a. Individual tests (Type I only) ................................ 4.2.1
b. Sampling tests .................................................... 4.2.2
4.2.1 Individual tests (Type I only). Each container shall be subjected to the following tests as
described under 4.5:
a. Filling pressure .................................................... 4.5.1
b. Leakage .............................................................. 4.5.2
4.2.2 Sampling test. The number of argon containers shall be selected in accordance with
Table II and subjected to the tests required by Table I.
4
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