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Compressed Gas Association , 11/21/2022
Publisher: CGA
File Format: PDF
$68.00$137.00
This publication applies to cryogenic liquid supply systems, located either on a customer site or a production site, where cryogenic liquid is vaporized and is then supplied either as the primary or secondary source of gaseous product. This publication is limited to the prevention of brittle fracture in piping and associated equipment installed downstream of the vaporization system.
The secondary source of supply can be a back-up supply to a production plant when the production plant trips or is shut down, a supplementary supply to meet customer demand where it exceeds the capacity of the production plant (peak shaving), or as a back-up supply at a customer site (for example, a healthcare facility).
The safeguard principles presented in this publication apply to any process fluid supply system where the temperature of the cryogenic liquid source is less than the minimum temperature rating of the piping and/or associated equipment downstream of the vaporizer.
Examples include:
Carbon dioxide and nitrous oxide are excluded from the scope of this publication; however, the principles of this publication may be applied.
The supply systems work by vaporizing cryogenic liquid, typically in response to decreasing pipeline pressure.
Supply systems are made up of the following:
Although this publication does not cover the following situations, the techniques listed may be considered for cold embrittlement prevention:
This publication recommends safe practice for the design of new cryogenic vaporizer systems. For existing systems, a risk assessment shall be undertaken to establish if any modifications are required. The principles developed in this publication can be used for this purpose.
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