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API 749.1

1986 Edition, May 1986

Complete Document

Report of the Subcommittee on Pressure-Relieving Systems Reference Document Project

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822-00520 * W/D NO S/S
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Product Details:

  • Revision: 1986 Edition, May 1986
  • Published Date: May 1986
  • Status: Not Active, See comments below
  • Document Language: English
  • Published By: American Petroleum Institute (API)
  • Page Count: 36
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:


The Subcommittee on Pressure-Relieving Systems was organized in the post-world War II period to develop standards and recommended practices f9r the design, installation, and operation of pressure-relieving and depressuring systems. These standards were also intended to simplify procurement of safety-relief valves.

The subcommittee now has responsibility for the following standardization publications:

1. Recommended Practice 520, Desisn and Installation of Pressure-Relieving Systems in Reflnerles.

a. Part I--Design.

b. Part II--Installation.

2. Recommended Practice 521, Guide for Pressure-Relieving and Depressuring Systems.

3. Standard 526, Flanged Steel Safety Relief Valves.

4. Standard 527, Commercial Seat Tightness of Safety Relief Valves with Metal-to-Metal Seats

5. Standard 2000, Venting Atmospheric and Low-Pressure Storage Tanks, Nonrefrigerated and Refrigerated

The subcommittee utilized many sources of information in the development of these documents. These sources include the practices of the various user companies and studies carried out by individual researchers, user companies, manufacturers, and engineering organizations, as well as the incividual expertise of subcommittee members. Published papers and reports, empirical data from technical manuals, and certain unpublished letters and test data.constituted the basis for formulating the subcommittee's standards.

As is the case of the many other consensus standardization efforts developed through Refining Department committees, the subcommittee did not systematically assemble and retain the references it used or considered over the years. Many of the papers and reports presented at API-sponsored technical symposia, articles that appeared in periodicals, and published references were retained in the API library. Other documents were retained in the files of individual committee members or API member companies.

During the last several years, the normal retirement of committee members and a major restructuring of the refining industry have combined to cause an almost complete turn-over of members of the Subcommittee on Pressure-Relieving Systems. Significant historical background on the development of the subcommittee's standards was being lost in the knowledge and files of those who were leaving after many years of participation in the development of those standards. The subcommittee petitioned the Committee on Refinery Equipment to make resources available to locate and assemble all documents referenced in the six publications under the subcommittee's authority. A former member of the subcommittee was assigned to the project in 1985.

The intent of the reference documents project was to establish a central file of technical data and documents to support the publications of the API Subcommittee on Pressure-Relieving Systems. This report is the result of that project.