Significant amounts of medical and industrial gases are being delivered in portable cryogenic liquid cylinders or 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 cylinder owners of DOT-4L/TC-4LM cylinders and provides requirements for the attachment of cylinder outlet connections and labeling of these cylinders.
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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