API RP 520 PT II: Sizing, Selection, and Installation of Pressure-Relieving Devices in Refineries Part II—Installation
SDO: API: American Petroleum Institute
DOD Adopted ANSI Approved Approved
This recommended practice covers methods of installation for pressure-relief devices for equipment that has a maximum allowable working pressure (MAWP) of 15 psig (1.03 bar g or 103 kPA) or greater. Pressure-relief valves or rupture disks may be used independently or in combination with each other to provide the required protection against excessive pressure accumulation. As used in this recommended practice, the term pressure-relief valve includes safety relief valves used in either compressible or incompressible ßuid service, and relief valves used in incompressible ßuid service. This recommended practice covers gas, vapor, steam, two-phase and incompressible ßuid service; it does not cover special applications that require unusual installation considerations.
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