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CGA: Compressed Gas Association, Inc.

CGA, the Compressed Gas Association, is a nonprofit organization that develops and publishes standards related to the equipment and supply chain used in the compressed gas industry. Headquartered near Washington, D.C., United States, CGA standards have been adopted by governmental agencies in the United States and Canada. CGA standards are agreed upon by over 125 contributing member companies across the world. CGA also serves as the administrator for the U.S. TAGs (United States Technical Advisory Group) to ISO/TCs 58, 197 and 220 (International Organization for Standardization/Technical Committee) and to many of the subcommittees for ISO/TC 58. Standards from CGA are available both individually, directly through the ANSI webstore, and as part of a Standards Subscription. If you or your organization are interested in easy, managed, online access to standards that can be shared, a Standards Subscription may be what you need - please contact us at: or 1-212-642-4980 or Request Proposal Price.

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ANSI/CGA G-2.1-2014

Requirements for the Storage and Handling of Anhydrous Ammonia (an American National Standard)

This standard is intended to apply to the design, construction, repair, alteration, location, installation, and operation of anhydrous ammonia systems including refrigerated ammonia storage systems.

CGA G-4.1-2009

Cleaning Equipment for Oxygen Service

The cleaning methods described in this publication are intended for cleaning equipment used in the production, storage, distribution, and use of liquid and gaseous oxygen. This publication does not replace or supersede any regulatory cleaning procedures or cleaning requirements specified by a national authority. Examples of such equipment (illustrative of the primary intent of this publication) are stationary storage tanks, cargo tankers, and tank cars; pressure vessels such as heat exchangers and rectification columns; and associated piping, valves, and instrumentation.

CGA P-1-2015

Standard for Safe Handling of Compressed Gases in Containers - 12th Edition

Users of compressed gas shall become familiar with the properties and inherent hazards of the products they use.áValuable information about each specific gas is contained in its product labeling and safety data sheet (SDS). Read this information and inform others of the importance of understanding and applying the precautions established within the available safety literature.

ANSI/CGA G-13-2015

Storage and Handling of Silane and Silane Mixtures (an American National Standard) - 3rd Edition

This standard governs the installation of systems and sources that are used to store, transfer, or contain silane or silane mixtures. This standard includes guidance for siting, design of equipment, piping and controls, and the fabrication and installation of silane gas storage and closed-use systems. Additional guidance on operational steps associated with the use of silane and silane mixtures as well as fire protection, gas monitoring, ventilation, and related safeguards are provided.

CGA G-5.5-2014

Hydrogen Vent Systems

This publication presents design guidelines for hydrogen vent systems used in gaseous and liquid hydrogen systems at user sites and provides recommendations for safe operation of these vents. It begins at the discharge port of safety devices and other components that control the release of hydrogen and ends at the point where hydrogen concentration in the atmosphere is below the lower flammable limits. It also provides information on the production, transportation, handling, and storage of compressed hydrogen, cryogenic liquid hydrogen, and related products. Additional information on hydrogen can be found in CGA G-5,Hydrogen, CGA G-5.4, Standard for Hydrogen Piping Systems at User Locations, CGA Handbook of Compressed Gases, and NFPA 55, Compressed Gases and Cryogenic Fluids Code [1, 2, 3, 4].1Pressure relief devices (PRDs) for cylinders and tube trailers required by U.S. Department of Transportation(DOT) in Title 49 of the U.S Code of Federal Regulations (49 CFR) are not covered in the scope of this publication[5].

CGA P-18-2013

Standard for Bulk Inert Gas Systems (an American National Standard) - 4th Edition

The purpose of this standard is to provide information on installation of bulk inert gas systems for argon, nitrogen, and helium service. This standard does not apply to carbon dioxide systems. For additional requirements on bulk inert gas systems at health care facilities, see CGA M-1, Guide for Medical Gas Supply Systems at Consumer Sites, NFPA 55, Compressed Gases and Cryogenic Fluids Code, and NFPA 99, Health Care Facilities Code. Bulk carbon dioxide system requirements are found in NFPA 55 and CGA G-6.1, Standard for Insulated Liquid Carbon Dioxide Systems at Consumer Sites.

CGA G-7.1-2011

Commodity Specification for Air

Describes the specification requirements for air. Provides data concerning quality verification systems, sampling, analytical procedures, containers, typical uses for various grades (QVLs) and supplemental specification tables. Previous edition cited in 29 CFR.  

CGA C-6-2013

Standard for Visual Inspection of Steel Compressed Gas Cylinders - 11th Edition

This standard provides cylinder users (requalifiers, owners, fillers, operators, etc.) with criteria to accept, reject, and condemn steel compressed gas cylinders. This standard does not cover all circumstances for each individual cylinder type and condition of lading. Inspection procedures include preparation of cylinders for inspection, exterior inspection, interior inspection (if required), nature and extent of damage to be looked for, and some tests that indicate the conditions of the cylinder, etc. A sample inspection report is shown in Appendix A that may be revised to suit the user's requirements

CGA C-6.4-2012

Methods for External Visual Inspection of Natural Gas Vehicle (NGV) and Hydrogen Vehicle (HV) Fuel Containers and Their Installations - Edition 4

This publication addresses containers manufactured to generally accepted codes and standards for fuel gas vehicle (FGV) service (see Section 4)

CGA G-7.1-2018

Commodity Specification for Air - Seventh Edition

Describes the specification requirements for air including atmospheric air and air synthesized by blending oxygen and nitrogen in the proper proportions. Atmospheric air contains a large variety of trace constituents. It is impractical to set individual limits for many of these; however, this specification qualifies certain grades of air by limiting the concentrations of specific trace constituents.


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