Publication

V-23: Standard for Cylinder Connections on Portable Cryogenic Liquid Cylinders

Abstract

Significant amounts of medical and industrial gases are being delivered in portable cryogenic liquid cylinders sometimes referred to as dewars, most commonly the DOT-4L/TC-4LM series cylinders. This publication was developed to prevent tampering of outlet connections on portable liquid cryogenic cylinders.

This publication is intended for owners of portable cryogenic liquid cylinders (i.e., DOT-4L/TC-4LM, UN 21029-1 cryogenic receptacles, authorized non-specification liquid helium cylinders) and provides requirements for the attachment of outlet connections and labeling of these cylinders. In the remainder of this publication, these containers will be referred to as cryogenic liquid cylinders.

Only trained and qualified personnel with knowledge of proper safety precautions shall perform modifications specified in this publication.

Users of cryogenic liquid cylinders and related equipment should be familiar with the characteristics and safe handling of gases as outlined in CGA P-1, Standard for Safe Handling of Compressed Gases in Containers and CGA P-2, Guideline for Characteristics and Safe Handling of Medical Gases .

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Properties

Edition:
2
Published:
August 2026
Status:
Available To the Public
Size:
2 pages
Publisher:
CGA
Special Attributes:
Notes:
Committee:
Cylinder Valve