What pressure relief device can be used in both gas or liquid service?

A. Safety valves
B. Relief valves
C. Safety relief valves
D. Rupture discs


A. Incorrect. Safety valves are used in compressible fluid service (gas, steam) and are spring-loaded devices.
B. Incorrect. Relief valves are used in liquid (incompressible fluid) service to limit the pressure in a vessel or system.
C. Correct. Safety relief valves are spring-loaded pressure relief devices that may be used in either liquid or gas service.
D. Incorrect. Rupture discs are a one-time use device that remains open after operation and must be replaced following each use.

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