Saferty relief valves used in either compressible or incompressible fluid service, and relief valves used in incompressible fluid service. Valves or rupture disks may be used independently or in combination with each other to provide the required protection against excessive pressure accumulation. This standard 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. Sizing, Selection, and Installation of Pressure-Relieving Devices in Refineries-Part II, Installation. The rules for overpressure protection of fired vessels are provided in ASME Section I and ASME B31.1, and are not within the scope of this standard. See API 521 for information about appropriate ways of reducing pressure and restricting heat input.Ītmospheric and low-pressure storage tanks covered in API 2000 and pressure vessels used for the transportation of products in bulk or shipping containers are not within the scope of this standard. Pressure relief devices protect a vessel against overpressure only they do not protect against structural failure when the vessel is exposed to extremely high On steady state flow of Newtonian fluids. It also includes sizing procedures and methods based

This standard includes basic definitions and information about the operational characteristics and applications of various pressure relief devices. The pressure relief devices covered in this standard are intended to protect unfired pressure vessels and related equipment against overpressure from operating and fire contingencies. This standard applies to the sizing and selection of pressure relief devices used in refineries and related industries for equipment that has a maximum allowable working pressure of 15 psig (103 kPag) Sizing, Selection, and Installation of Pressure-relieving Devices in Refineries, Part I - Sizing and Selection.

Api standard 598