MIL-PRF-27407D
filling pressure exceed the rated service pressure of the container. Pressure-Temperature Filling Charts in
CGA P-15 may be used.
3.4.2 Leakage. Cylinders shall not leak when tested according to 4.6.2.
3.4.3 Inspection and maintenance. Compressed gas cylinders shall be inspected, maintained
and charged according to 4.6.3.
4.
VERIFICATION
4.1 Points of inspection (see 6.2). 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 4.6
a. Filling pressure .................................................... 4.6.1
b. Leakage .............................................................. 4.6.2
TABLE I. Grade limits for helium (Type I, gaseous only) 1
Grade
Test Method
A
B
Purity, % by vol, min
99.995
99.997
4.4.1
2
Impurities, ppm by vol, max
4.4.2
50
--
9
Water
4.4.2
9
1
Hydrocarbons (as methane)
4.4.2
5
3
Oxygen
4.4.2
3
5
Nitrogen + argon
4.4.2
14
23
Neon
4.4.2
23
1
Hydrogen
4.4.2
1
2
--
Carbon dioxide
4.4.2
1
2
--
Carbon monoxide
4.4.2
1
Notes:
1. For Type II requirements see 4.5. When using vent gas analysis, the analysis shall conform to
Grade A or B requirements, as specified in the contract.
2. No limit for this grade; minimum purity shall be met.
4
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