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API RP 521

4th Edition, March 1997

Complete Document

Guide for Pressure-Relieving and Depressuring Systems

Includes all amendments and changes through Errata , February 15, 1999


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Superseded By: API STD 521

EN
Additional Comments:
W/D S/S BY API STD 521
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Referenced Items:

AGA XK0775
API PUBL 2216
API PUBL 2218
API RP 2003

Product Details:

  • Revision: 4th Edition, March 1997
  • Published Date: February 15, 1999
  • Status: Superseded By:
  • Superseded By: API STD 521
  • Document Language: English
  • Published By: American Petroleum Institute (API)
  • Page Count: 202
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:



1.1 Scope

This recommended practice is applicable to pressure-relieving and vapor depressuring systems. The information provided is designed to aid in the selection of the system that is most appropriate for the risks and circumstances involved in various installations. This recommended practice is intended to supplement the practices set forth in API Recommended Practice 520, Part 1, for establishing a basis of design.

This recommended practice provides guidelines for examining the principal causes of overpressure; determining individual relieving rates; and selecting and designing disposal systems, including such component parts as vessels, flares, and vent stacks.

Piping information pertinent to pressure-relieving systems is presented in 5.4.1, but the actual piping should be designed in accordance with ASME B31.3 or other applicable codes.

Health risks may be associated with the operation of pressure-relieving equipment. The discussion of specific risks is outside the scope of this document.