1、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.ASME PTC 12.4-1 992 I AN AMERICAN NATIONAL STANDARD T H E A M E R I C A N S O C I E T Y OF
2、 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.10017 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.Uncontrolle
3、d when printed.Date of Issuance:May 24,1993 This Standard will be revised when the Society approves the issuance of a new edition.There will be no addenda or written interpretations of the require-ments of this Standard issued to this edition.ASME is the registered trademark of The American Society
4、of Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria for American National Standards.The Consensus Committee that approved the code or standard was balance to assure that individuals from competent and concerned interests have had an opportu
5、nity to participate.The proposed code or standard was made available for public review and comment which provides an opportunity for additional public input from industry,academia,regulatory agen-cies,and the public-at-large.ASME does not approve,rate,or endorse any item,construction,proprietary dev
6、ice,or activity.ASME does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in this document,and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable Letters Patent,nor assu
7、me any such liability.Users of a code or standard are expressly advised that the determination of the validity of any such patent rights,and the risk of the infringement of such rights,is entirely their own responsibility.Participation by federal agency representative(s1 or person(s)affiliated with
8、industry is not to be interpreted as government or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations issued in accordance with governing ASME procedures and policies which preclude the issuance of interpretations by individual vol-unteers.No par
9、t of this document may be reproduced in any form,in an electronic retrieval system or otherwise,without the prior written permission of the publisher.Copyright 0 1993 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in U.S.A.Copyrighted material licensed to Stanford Univer
10、sity 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 ASME PTC 12.4-1 992.)Moisture Separator Reheaters(MSRs)were introduced to steam power cycles after t
11、he advent of commercial nuclear power.A moisture separator,with no reheat was first added to nuclear power cycles to minimize the low pressure (LP)turbine erosion caused by wet steam prevalent in those cycles and improve turbine cycle performance.Steam reheat was added later to reduce further the qu
12、antity of moisture in the steam passing through the LP turbine and to increase further the efficiency of the LP turbine.The first MSRs were susceptible to many modes of failure.Great technological advances have occurred over the past 30 years with respect to MSR design and operation.These advances i
13、ncreased the reliability and enhanced the performance of the MSR which pro-vided the momentum and justification for MSR upgrades.During the 1970s and early 1980s an increasing number of utilities were involved in MSR upgrades which included replacing portions of or their entire MSRs.The ASME Board o
14、n Performance Test Code was notified in June 1984 that no code existed for the testing and analysis of MSRs.PTC-6(1982)on steam turbines treated the MSR as an integral part of a turbine generator,which it is when purchased as a package.The Board authorized the formation of a new performance test cod
15、e committee to develop a code for the treatment of the MSR as a separate component.A new committee was formed and first met in December 1985.Numerous drafts were developed over the next 4 years,each more detailed than the previous.Upon the comple-tion of appendices containing a set of sample calcula
16、tions and a complete uncertainty analysis,the draft was released for the industry review in July of 1990.The comment resolution process,completed in April 1991,strengthened the document.The committee was balloted and approved the code draft in July 1991.The Board on Performance Test Codes approved the code in January 1992.This test code has been approved as an Amer-ican National Standard by the ANSI Board of Standards Review on November 24,1992.Copyrighted material licensed to Stanford Universit