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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.

Below are CGA's best-selling standards. To find additional standards, please use the search bar above.

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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.

CGA G-4.1-2018

Cleaning Equipment for Oxygen Service - seventh edition

This publication describes the cleaning methods and requirements for equipment used in the production, storage, distribution, and use of liquid and gaseous oxygen to reduce the risk of fire, explosion, or promotion of combustion. Cleaning in accordance with this publication is required for all surfaces in contact with a gas or liquid that has an oxygen concentration greater than 23.5%. Examples of such equipment include stationary storage tanks, road tankers, and rail cars; pressure vessels such as heat exchangers and distillation columns; compressors and pumps; and associated piping, valves, and instrumentation. However, the cleaning methods and requirements are not limited to this equipment. With modifications, these methods may be used for cleaning other oxygen and oxidizer (e.g., fluorine, nitrogen trifluoride, nitrous oxide) service equipment such as cylinders, cylinder valves, cylinder regulators, welding torches, and pipelines where regulatory requirements do not specify cleaning methods.

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-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 C-6-2019

Standard for Visual Inspection of Steel Compressed Gas Cylinders - 12th Edition

This standard provides cylinder users (requalifiers, owners, fillers, operators, etc.) with criteria to accept, reject, and condemn steel compressed gas cylinders.

ANSI/CGA P-18-2020

Bulk Inert Gas Systems - Fifth Edition

This standard contains minimum requirements for locating/siting, selecting equipment, installing, starting up, maintaining, and removing bulk inert gas supply systems.

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.

CGA C-6.3-2019

Visual Inspection of Low Pressure Aluminum Alloy Compressed Gas Cylinders - Fourth Edition

This publication covers the periodic inspection of aluminum alloy compressed gas cylinders with service pressures of 500 psi (35 bar) or less. This publication may not cover all circumstances for each individual cylinder type or lading. Inspection agencies may find it necessary to amplify these requirements to fit their condition of service if the service is more severe than encountered in transportation

CGA C-6.2-2019

Visual Inspection and Requalification of Fiber Reinforced High Pressure Cylinders - 8th Edition

This standard addresses the techniques for the inspection and requalification of composite overwrapped high pressure cylinders. The use of this standard is required in the United States by Title 49 of the U.S. Code of Federal Regulations (49 CFR) Part 180.205(f)(1) and in Canada by CSA B339, Clause 24 [6, 4]. The requalification consists primarily of an internal and external visual inspection followed by hydrostatic testing. This standard highlights those items that are essential for an accurate appraisal of a composite overwrapped cylinder for compressed gas service. For information on requirements of general cylinder inspection and requalification (visual inspection and hydrostatic testing), refer to the publications listed in Section 4.

CGA S-1.1-2019

Pressure Relief Device Standards - Part 1 - Cylinders for Compressed Gases

CGA S-1.1 is the definitive standard for the selection of the correct pressure relief device that is required to meet the requirements of the U.S. DOT in 49 CFR for over 150 gases. It provides guidance on when a pressure relief device can be optionally omitted, and when the use of a pressure relief device is prohibited. It provides direction and guidance on the manufacture and testing of pressure relief devices as well as the operation parameters and maintenance.   Previous edition cited in 49 CFR. Previous edition cited in 29 CFR.


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