CGA Position Statement on Non-ASME Certified Pressure Relief Valves Used for Thermal Expansion Relief in Certain Piping Systems, Second Edition

Published by	Publication Date	Number of Pages
CGA	06/14/2019	1

Category: CGA

Description

CGA PS-28 – CGA Position Statement on Non-ASME Certified Pressure Relief Valves Used for Thermal Expansion Relief in Certain Piping Systems, Second Edition

A thermal expansion relief valve is a pressure relief device used on piping systems to prevent overpressurization caused by the thermal expansion of a limited volume of trapped process fluid. A thermal expansion relief valve is normally used on piping systems where cryogenic liquids or cold gases can be trapped between two valves or between two devices. Thermal expansion relief valves are also called line block safeties, pop safeties, or thermal relief valves. This publication addresses requirements for installation and retesting of these valves.