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About This Item

 

Full Description

This standard is applicable to pressure-relieving and vapor depressuring systems. Although intended for use primarily in oil refineries, it is also applicable to petrochemical facilities, gas plants, liquefied natural gas (LNG) facilities, and oil and gas production facilities. 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 standard specifies requirements and gives guidelines for the following:
  • examining the principal causes of overpressure;
  • determining individual relieving rates;
  • selecting and designing disposal systems, including such component parts as piping, vessels, flares, and vent stacks.
This standard does not apply to direct-fired steam boilers.
 

Document History

  1. API Std 521

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    Pressure-relieving and Depressuring Systems, Seventh Edition

    • Most Recent
  2. API Std 521


    Pressure-relieving and Depressuring Systems, Sixth Edition

    • Historical Version
  3. API Std 521


    Guide for Pressure-relieving and Depressuring Systems: Petroleum petrochemical and natural gas industries-Pressure relieving and depressuring systems, Fifth Edition (Includes 2008 Addendum)

    • Historical Version
  4. API 521


    Guide for Pressure-Relieving and Depressuring Systems

    • Historical Version