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NOTICE OF I ADOPTION I

ADOPTION NOTICE 1 6 April 1992 for API STD 527-91 THIRD EDITION July 1991 SUPERSEDING API STD 527-78(R87) SECOND EDITION 21 June 1989

API STD 527-91 was adopted 6on April 1992 and is approved for use by the Department of Defense (DoD). The AmericanPetroleum Institute has furnished t clearance required by existing regulations. Copies the document are stocked of 4D, at the Standardization Documents Order Desk, Bldg. 700 Robbins Avenue, to Philadelphia, PA 19111-5094, for issue DoD activities only. All othe-r requestors must obtain copies from: American Petroleum Institute Publications and Distribution 1220 L Street, Northwest Washington, DC20005 Section

Title of Document: Seat Tightness of Pressure Relief Valves Date of Specific Issue Adopted: July 1991, Third Edition Releasing Non-Government Standards Body: American Petroleum Institute Custodians: Army - ME Navy YD Air Force - 99 Military Coordinating Navy - YD (Project 4820-0628)

Activity:

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Review Activities: Army - CE Air Force - 82 DLA - CS User Activity: Navy - MC
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COPYRIGHT American Petroleum Institute Licensed by Information Handling Services

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Seat Tightness of Pressure Relief Valves

API STANDARD 527 THlRD EDITION, JULY 1991

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COPYRIGHT American Petroleum Institute Licensed by InformationHandling Services

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A P I STD*527 91 E 0732290 0099b83 4 E

Seat Tightness of Pressure Relief Valves

Refining Department

API STANDARD 527 THIRD EDITION, JULY 1991

American Petroleum Institute

COPYRIGHT American Petroleum Institute Licensed by Information Handling Services

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A P I STD*527

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SPECIAL NOTES
1. API PUBLICATIONS NECESSARILYADDRESS PROBLEMS OF A GENERAL NATURE. WITH RESPECT TO PARTICULAR CIRCUMSTANCES, LOCAL, STATE, AND FEDERAL LAWS AND REGULATIONS SHOULD BE REVIEWED. 2. API IS NOT UNDERTAKING TO MEET THE DUTIES OF EMPLOYERS, MANUFACTURERS, OR SUPPLIERS TO WARN AND PROPERLY TRAIN AND EQUIP THEIR EMPLOYEES, AND OTHERS EXPOSED, CONCERNING HEALTH AND SAFETY RISKS AND PRECAUTIONS, NOR UNDERTAKING.THEJR OBLIGATIONS UNDERLOCAL, STATE, OR FEDERAL LAWS.

3. INFORMATION CONCERNING SAFETY AND HEALTH RISKS AND PROPER PRECAUTIONS WITH RESPECT TO PARTICULAR MATERIALS AND CONDITIONS SHOULD BE OBTAINED FROM THE EMPLOYER, THE MANUFACTURER OR SUPPLIER OF THAT MATERIAL, OR THE MATERIAL SAFETY DATA SHEET.
4. NOTHING CONTAINEDIN ANY API PUBLICATION IS BE CONSTRUED AS TO GRANTING ANY RIGHT, BY IMPLICATION OR OTHERWISE, FORTHE MANUFACTURE, SALE, OR USE OF ANY METHOD, APPARATUS, ORPRODUCT COVERED BY LETTERS PATENT. NEITHER SHOULD ANYTHING CONTAINED IN THE PUBLICATIONBE CONSTRUED AS INSURING ANYONE AGAINSTLIABILITY FORINFRINGEMENT OF LETTERS PATENT.

5. GENERALLY, API STANDARDS AREREVIEWED AND REVISED,REAFFIRMED, OR WITHDRAWN LEAST EVERY FIVE YEARS. SOMETIMES A ONEAT TIME EXTENSION OF UP TO TWO YEARS WILL BE ADDED TOTHIS REVIEW CYCLE. THIS PUBLICATIONWILL NO LONGER BE IN EFFECT FIVE YEARS AFTER ITS PUBLICATION DATE AS AN OPERATIVE API STANDARDOR, WHERE AN EXTENSION HAS BEEN GRANTED, UPON REPUBLICATION. STATUS OF THE PUBLICATION CAN BE ASCERTAINED FROM THE API AUTHORING DEPARTMENT [TELEPHONE (202) 682-8000]. A CATALOG OF API PUBLICATIONS AND MATERIALS IS PUBLISHED ANNUALLY AND UPDATED QUARTERLY BYAPI, 1220 LSTREET,N.W., WASHINGTON, D.C.20005.

Copyright O 1991 American Petroleum Iristitute

COPYRIGHT American Petroleum Institute Licensed by Information Handling Services

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FOREWORD
This standard describes tests to determine the seat tightness of metal- and soft-seated pressure relief valves. Valves conventional,bellows, and pilot-operated designs are...