CGA’s October & November 2021 Safety Publications (New Releases & Revisions)

December 16, 2021

During October and November 2021, the Compressed Gas Association (CGA) issued the following new and revised safety standards and safety alerts:

CGA G-4.1F, Nettoyage D’équipment Pour un Service en Contact Avec de L’oxygène

Released: November 18, 2021 (7th Edition)

French translation of CGA G-4.1, Cleaning of Equipment for Oxygen Service (2018 – 7th Edition).

Cette publication décrit les méthodes de nettoyage et les exigences relatives aux équipements utilisés dans la production, le stockage, la distribution et l’utilisation d’oxygène liquide et gazeux afin de réduire le risque d’incendie, d’explosion ou de promotion de la combustion.

CGA P-48, Reciprocating Cryogenic Pumps and Pump Installations for Oxygen, Argon, and Nitrogen

Released: October 1, 2021 (2nd Edition)

Reciprocating cryogenic pumps have become key components within the industrial gas industry handling primarily liquid oxygen, argon, and nitrogen. To ensure that pumps operate both safely and reliably, it is important that pumps are correctly designed, installed, operated, and maintained for the required duty.

Pumping cryogenic fluids is accompanied by some degree of hazard. The hazards include liquid under pressure, cryogenic temperatures, volume and pressure increases due to vaporization, and the ability of oxygen to accelerate combustion.

CGA P-48 gives guidance to manage these hazards, and is intended to cover cryogenic reciprocating pumps and installations for liquid oxygen, argon, and nitrogen.

CGA P-89, Prevention of Plant Instrument and Utility Gas System Cross Contamination

Released: November 5, 2021 (1st Edition)

This publication provides recommendations and minimum requirements for the design and safeguards of utility and instrument gas systems and their interconnections, both permanent and temporary. It includes startup systems as well as maintenance and continuous purge connections. It identifies the potential hazards resulting from the connections between purge gases, instrument gases, and the process. These requirements may also be considered for existing facilities.

CGA P-89 was developed around and applies to HYCO plants, which are facilities that produce hydrogen and/or carbon monoxide. These plants are typically operated with feed stocks such as natural gas, refinery off gas, naphtha, and other light hydrocarbons. 

The principles and concepts identified in this publication are applicable to other segments of the gases industry (for example, specialty gas plants and air separation units), although some of the scenarios described might not apply and some design details can require modification. Other technologies could require either more or less stringent minimum requirements depending on the specific application, whether contamination is a safety concern or a quality or reliability concern, and the severity of any consequences.

CGA SA-40, Safety Alert, CGA 870 Medical Oxygen Regulator Yoke Connection Issue

Released: October 8, 2021 (1st Edition)

The Compressed Gas Association has received reports of certain medical gas regulator yokes available for purchase and use in the United States and Canada that do not meet CGA standards. Use of these non-conforming regulator yokes may result in these regulator yokes not achieving a proper connection and seal with oxygen cylinders that utilize certain CGA 870 pin-indexed valves that conform to applicable CGA standards.