MIL-PRF-27407D
COMMERCIAL ITEM DESCRIPTIONS
A-A-59860
Valves, Cylinder, Gas (For Compressed or Liquefied Gases)
(Copies of these documents are available online at https://quicksearch.dla.mil.)
2.3 Non-government publications. The following documents form a part of this document to the
extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the
solicitation or contract.
ASTM INTERNATIONAL
ASTM E29
Standard Practice for Using Significant Digits in Test Data to Determine
Conformance with Specifications (DoD Adopted)
ASTM F307
Standard Practice for Sampling Pressurized Gas for Gas Analysis (DoD
Adopted)
ASTM F310
Standard Practice for Sampling Cryogenic Aerospace Fluids (DoD
Adopted)
(Copies of these documents are available online at https://www.astm.org.)
COMPRESSED GAS ASSOCIATION (CGA)
CGA G-9.1
Commodity Specification for Helium
CGA P-15
Filling of Industrial and Medical Nonflammable Compressed Gas
Cylinders
(Copies of these documents are available online at https://www.cganet.com.)
2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a
conflict between the text of this document and the references cited herein (except for related specification
sheets), the text of this document takes precedence. Nothing in this document, however, supersedes
applicable laws and regulations unless a specific exemption has been obtained.
3.
REQUIREMENTS
3.1 Grade requirements.
3.1.1 Type I. The purity and impurity concentrations as applicable to each grade of helium shall
conform to the limits of Table I when tested in accordance with the applicable test method also specified
in Table I. Limits and tests may be added or deleted by the procuring activity (see 6.2).
3.1.2 Type II. The liquid shall pass the helium assurance test of 4.5. When using the vent gas
analysis (see 4.5), the vent gas analysis shall conform to the limits of Table I. Limits and tests may be
added or deleted by the procuring activity (see 6.2).
3.2 Limiting values. The following applies to all specified limits in this specification: For
purposes of determining conformance with these requirements, an observed value or a calculated value
shall be rounded off in the last right-hand digit used in expressing the specification limit, using the
Rounding Method of ASTM E29.
3.3 Filter. Unless otherwise specified (see 6.2), Types I and II need not be filtered.
3.4 Filled containers (Type I only).
3.4.1 Filling 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 4.6.1. In no case shall the
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