scope:

This recommended practice is intended to cover methods of installation for pressure-relieving devices. Pressure relief valves or rupture disks may be used independently or in combination with each other to provide the required protection against excessive overpressure. As used in this recommended practice, the term pressure relief valve includes safety relief valves used in compressible-fluid service and relief valves used in liquid service. This recommended practise covers gas, vapor, and liquid service; it does not cover special applications that require unusual installation considerations.