Print Page Email Page Smaller Text Larger Text

API RP 520 PT II: Sizing, Selection, and Installation of Pressure-Relieving Devices in Refineries Part II—Installation

Publication Date: Aug 1, 2003
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.

Buy this Standard Now

Or if you answer yes to any of these questions:


  • Do you purchase more than $3000 in standards per year?
  • Do you purchase many different kinds of standards?
  • Do you have multiple employees accessing the same standards?

You may save money by purchasing more comprehensive online access.

* Required field

* First Name:

* Last Name:

* Email Address: