Description

CGA P-59 – Prevention of Overpressure During Filling of Cryogenic Vessels

This publication is intended to provide guidance to the filler/owner of either transportable or static cryogenic tanks, detailing the systems and procedures that can be used to prevent them being overpressurized during filling. Vessels for which the upper pressure limit cannot be exceeded by the maximum allowable pump feed pressure do not require any additional protection.

It is intended to address the issue of receiving vessels greater than 265 gal (1000 L) water capacity for liquid argon, nitrogen, oxygen, natural gas, helium, hydrogen, or ethylene. This publication should also be used for receiving vessels under 265 gal (1000 L) that are not designed for transport when full. This publication can also be used as guidance for other products and other transfer systems. It does not consider the hazardous nature of any product release, only the prevention of a failure of the tank due to pressure.

Protective measures that prevent the overpressurization of receiving vessels in service (e.g., by failure of the vacuum, pressure raising, flame engulfment, etc.) are detailed in other codes and standards, and are not considered further here.