Codes and Standards Instrumentation Process Equipments Relief devices

API Standards for Pressure Relieving Systems

API Standard Title Description
API-520 Part I Sizing, Selection, and Installation of Pressure Relieving Devices in Refineries—Part I, Sizing and Selection Guide for sizing and selection of pressure relief devices used in petroleum related industries for equipments with maximum allowable working pressure of 15 psig greater. The document is intended for protection of unfired pressure vessels and equipments against overpressure from operation or fire.
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{adinserter 1}
API-520 Part II Sizing, Selection, and Installation of Pressure Relieving Devices in Refineries—Part II, Installation Guide for installation of pressure relief devices used in petroleum related industries for equipments with maximum allowable working pressure of 15 psig greater.
API-521 Guide for Pressure relieving and Depressuring Systems Petroleum petrochemical and natural gas industries—Pressure relieving and depressuring systems This API standard specifies requirements and gives guidelines for determining overpressure causes, relieving rates for pressure relieving and vapor depressurizing systems in petroleum related industries. The standard also discusses selection and design of disposal systems, including such component parts as piping, vessels, flares, and vent stacks.{adinserter 1}
API-526 Flanged Steel Pressure relief Valves The standard covers specifications for flanged steel pressure relief valves (PRVs) by presenting basic requirements such as orifice designation and area, valve size, pressure rating, materials etc. for direct spring-loaded pressure relief valves and pilot-operated pressure relief valves.
API-527 Seat Tightness of Pressure Relief Valves Describes methods of determining the seat tightness of metal- and soft-seated pressure relief valves (PRVs), including those of conventional, bellows, and pilot-operated designs.
API-576 Inspection of Pressure-relieving Devices Describes the inspection and repair practices for automatic pressure relieving devices commonly used in the oil and petrochemical industries. This API standard covers pressure relief valves, pilot-operated pressure relief valves, rupture disks, and weight-loaded pressure-vacuum vents, with regards to inspection and repair.
API-2000 Venting Atmospheric and Low-pressure Storage Tanks Petroleum, petrochemical and natural gas industries—Venting of atmospheric and low-pressure storage tanks Guide for normal and emergency vapor venting requirements for above ground petroleum and petroleum product storage tanks, above ground and underground refrigerated storage tanks. The tanks discussed in the document are designed for low pressures ranging from full vacuum through 15 psig. This API standard discusses causes of overpressure and vacuum, venting requirements, means of venting, selection,
and installation of venting devices and testing and marking of relief devices etc for storage tanks.{adinserter 1}

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