Decoding CGA’s Publications Library

JULY 27, 2022


If you have ever read a CGA publication, you may have noticed that each publication has a unique alphabetical and numerical identifier. But did you know that you can use the alphabetical identifier as a clue to help determine the expected content of the publication?  

The identifiers are either single letter for standards and guidelines grouped in broad technical categories, or a double letter identifier for helpful technical and educational information presented as alerts, bulletins, position statements, training materials, and reports. 

First, lets look at the single letter identifiers:    

C = Cylinders

Publications that address steel, aluminum, and composite cylinders including information on methods of pressure testing, requalification, inspection, marking, change of gas service, internal corrosion, etc.   

E = Equipment  

Publications that address equipment such as hose and hose connections, low pressure pipeline station outlet/regulator inlet connections, regulators, flowmeters, and orifice flow selectors, etc.  

F = Food Gases  

Publications that address food gases and management systems, good manufacturing practices, hazard analysis and risk-based preventative control, qualifying suppliers used by food and beverage gas distributors and manufacturers, analytical validations for food gases, etc.  

G = Gases 

Publications that address gases including acetylene, anhydrous ammonia, sulfur dioxide, oxygen, hydrogen, carbon dioxide, air, nitrous oxide, helium, nitrogen, argon, hydrogen sulfide, silane, nitrogen trifluoride, fluorine, arsine, phosphine, hydrogen selenide, natural gas as well as equipment and processes related to these gases.  

H = Hydrogen 

Publications that specifically address hydrogen and other issues such as cryogenic hydrogen storage, hydrogen fuel technologies, bulk hydrogen supply systems, steam reformer operations, syngas outlet systems, hydrogen pressure swing adsorbers, HYCO plants, etc.  

M = Medical Gases  

Publications that address medical gases including use at a variety of different facilities, design of systems, analytical method validation, quality management systems, changes of grade/product, etc.  

P = Protection & Safe Handling 

In this largest category are these publications that address many aspects of protection and safe handling. Including the safe handling, use, transfilling, and storage of compressed gases in containers, safe practices for air separation units (ASUs) and related processes and components, hazard communication, process safety management, plant integrity management, oxygen deficient atmospheres, container product migration, etc.  

S = Safety Devices  

Publications that address Pressure Relief Devices (PRDs) and other safety devices.   

V = Valves & Valve Connections 

Publications that address many different types of valves, valve outlet and inlet connections, transfer connections, high pressure gas trailer connections, leak detection fluids, marking requirements, torque guidelines, etc.   


Now, let’s look at the double letter identifiers: 


PS = Position Statements 

Publications that are used to document CGA’s position on a subject. A PS may be used to communicate an existing position to regulators, code developers, or outside organizations. 

SA = Safety Alerts 

Publications that are used for quick notification of an imminent danger resulting from an incident or a situation known to be potentially hazardous. Alerts are posted to CGA’s website free of charge. 

SB/TB = Safety Bulletins/Technical Bulletins  

Publications that may include enforceable language or provide guidance and are 2 to 3 pages. There is an ongoing effort to incorporate SB/TBs into existing publications or transition to a standard or guideline.  

TM = Training Materials  

Communications intended to teach compliance with or communicate Standards and/or guidance generally targeted to an audience other than safety or technical experts, or those knowledgeable in the subject. Examples of training materials include safety posters, videos, and eLearning modules. 

TR = Technical Reports 

Reports which provide documentation of research or testing completed to verify or establish CGA positions. 


If you would like to access a copy of CGA’s entire library, members can log onto the CGA member portal and download it here:  

Founded in 1913, the Compressed Gas Association (CGA) is dedicated to the development and promotion of safety standards and safe practices in the industrial, medical, and food gases industry. CGA represents more than 110 member companies including manufacturers, distributors, suppliers, and transporters of gases, cryogenic liquids, and related products and services. Through a committee system, CGA develops technical specifications, safety standards, and training and educational materials, and works with government agencies to formulate and promote compliance with responsible regulations and standards.

Press Contact:

Paul Pflieger