ASME_N278-1-1975.pdf

A M E R I C A N N A T I O N A L S T A N D A R D R E A C T O R P L A N T S A N D T H E I R M A I N T E N A N C E Self-operated and Power-Operated Safety-Related Valves Functional Specification Standard ANSI N278.1-1975 .REAFFIRMED 1992 FOR CURRENT COMMITTEE PERSONNEL PLEASE SEE ASME MANUAL AS-11 SECRETARIAT THE AMmlCAN SOCIETY OF MECHANICAL ENGINEERS PUBLISHED BY T H E A M E R I C A N S O C I E T Y O F M E C H A N I C A L E N G I N E E R S United Engineering Center 345 East 47th Street New York,N.Y.1001 7 Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.AMERICAN NATIONAL STANDARD An American National Standard implies a consensus of those substantially concerned with its scope and provisions.An American National Standard is intended as a guide to aid the manufacturer,the consumer,and the general public.The existence of an American National Standard does not in any respect preclude anyone,whether he has approved the standard or not,from manufacturing,marketing,purchasing,or using products,processes,or procedures not conforming to the standard.American National Standards are subject to periodic review,and users are cautioned to obtain the latest editions.CAUTION NOTICE:This American National Standard may be revised or withdrawn at any time.The procedures of the American National Standards Institute require that action be taken to reaffirm,revise,or withdraw t h i s standard no later than five years from date of pub-lication.Purchasers of American National Standards may receive current infoimation on all standards by calling or writing the American National Standards Institute.This standard was approved by the American National Standards Committee N45 and its Secretariat,and it was subsequently approved and designated N278.1-1975 by the American National Standards institute on September 18,1975.No part of this document may be reproduced in any form,in an electronic retrieval system or otherwise,without the prior written permission of the publisher.THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS Copyright 0 1976 by All Rights Reserved Printed in U.S.A.Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.FOREWORD(This foreword is not part of American National Standard Self-operated and Power-operated Safety-Related Valves Functional Specification Standard)This standard is one of a series of power plant equipment standards provided to assure that safety-related equipment will function as specified.The standard was developed under sponsorhip of the American Society of Mechanical Engineers(ASME)as an effort by the American National Standards Committee N45 on Reactor Plants and Their Maintenance.This committee has been chartered to promote the development of standards for the location,design,construction,and maintenance of nuclear reactors and plants embody-ing nuclear reactors,including equipment,methods,and components specifically for this purpose.In October of 1972,the N45 Committee of ANSI established a task force to prepare a series of standards to assure that safety-related valves would function as specified.This standard provides for the specification of the required functional characteristics of these valves.Utilization of this standard will provide assurance that the functional requirements of valves are fully described so that valves can be designed to provide safe,reliable operation for all foreseeable conditions including preoperational tests and extreme limits of plant design conditions.Suggestions for improvement gained in the use of this standard will be welcomed.They should be sent to the secretary,American National Standards Committee N45,The American Society of Mechanical Engi-neers,United Engineering Center,345 East 47th Street,New York,New York 10017.iii Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.AMERICAN NATIONAL STANDARDS COMMITTEE N&*Reactor Plants and Their Maintenance OFFICERS Sol Burstein,Chairman S.A.Bernsen.Vice-chairman Manuel Gutierrez,Secretary COMMITTEE PERSONNEL AMERICAN FEDERATION OF LABOR AND CONGRESS OF INDUSTRIAL ORGANIZATIONS f.R.Shoop,International Brotherhood of Electrical Workers,Washington,D.C.AMERICAN NUCLEAR SOCIETY J.S.Moore,Westinghouse Electric Corporation,Pittsburgh,Pennsylvania J.R.Roh/fs,North American Rockwell,Canoga Park,California AMERICAN SOCIETY OF CIVIL ENGINEERS A.A.Ferlito,Ebasco Services,New York,New York C.6.Miczek,Stone and Webster Engineering Corporation,Boston,Massachusetts AMERICAN SOCIETY OF MECHANICAL ENGINEERS,THE E.C.Bailey,Commonwealth Edison Company,Chicago,Illinois V.S.Boyer,