Publication Detail: P-40
Calculation Method for the Analysis and Prevention of Overpressure During Refilling of Cryogenic Tanks with Rupture Disk(s)
Edition: 4
Published: September, 2017
Status: Available
Type: Standards and Specifications
Catalog group: Protection and Safe Handling
Size: 46 pages
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Publisher: CGA
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This publication provides technical guidance and the complete equation set needed to determine if a particular vessel can or cannot be overpressurized during the refill operation. Acceptable engineering controls for the protection of cryogenic storage tanks and transport tanks with rupture disk(s) as part of the relief system are provided. The application of these engineering controls constitutes a minimum standard.

The calculations in this publication may be used to evaluate each pumping system and cryogenic tank combination in use with oxygen, nitrogen, or argon. It applies to tanks filled either by pump from a cryogenic transport or by a ground-mounted pump. This applies to cryogenic tanks greater than 265 gal (1000 L) water capacity. This does not apply to cryogenic tanks with flat bottoms. For flat bottomed cryogenic tanks, refer to CGA P-8.9, Bulk Liquid Oxygen, Nitrogen, and Argon Storage Systems at Production Sites.

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