1、2021ASME Boiler andPressure Vessel CodeAn International CodeRules for Constructionof Power BoilersSECTION IASME BPVC.I-2021Markings such as“ASME,”“ASME Standard,”or any other marking including“ASME,”ASME logos,or the ASME Single Cerficaon Mark shall not be used on any item that is not constructed in
2、 accordance with all of the applicable requirements of the Code or Standard.Use of of the ASME Single Cerficaon Mark requires formal ASME cerficaon;if no cerficaon program is available,such ASME markings may not be used.(For Cerficaon and Accreditaon Programs,see hps:/www.asme.org/cerficaon-accredit
3、aon.)Items produced by pares not formally possessing an ASME Cerficate may not be described,either explicitly or implicitly,as ASME cerfied or approved in any code forms or other document.IRULES FOR CONSTRUCTIONOF POWER BOILERSASME Boiler and Pressure Vessel Committeeon Power BoilersAN INTERNATIONAL
4、 CODE2021 ASME Boiler&Pressure Vessel CodeJuly 1,20212021 EditionTwo Park Avenue New York,NY 10016 USADate of Issuance:July 1,2021This international code or standard was developed under procedures accredited as meeting the criteria for American National Standards and it is an American National Stand
5、ard.The Standards Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate.The proposed code or standard was made available for public review and comment that provides an opportunity for additio
6、nal public input from industry,academia,regulatory agencies,and the public-at-large.ASME does not“approve,”“certify,”“rate,”or“endorse”any item,construction,proprietary device,or activity.ASME does not take any position with respect to the validity of any patent rights asserted in connection with an
7、y 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 assume any such liability.Users of a code or standard are expressly advised that determination of the validity of any such patent ri
8、ghts,and the risk of infringement of such rights,is entirely their own responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard.ASME accepts responsibility for only tho
9、se interpretations of this document issued in accordance with the estab-lished ASME procedures and policies,which precludes the issuance of interpretations by individuals.The endnotes and preamble in this document(if any)are part of this American National Standard.ASME Collective Membership MarkASME
10、 Single Certification MarkASME and the above ASME symbols are registered trademarks of The American Society of Mechanical Engineers.No part of this document may be reproduced in any form,in an electronicretrieval system or otherwise,without the prior written permission of thepublisher.Library of Con
11、gress Catalog Card Number:56-3934Printed in the United States of AmericaAdopted by the Council of The American Society of Mechanical Engineers,1914;latest edition 2021.The American Society of Mechanical EngineersTwo Park Avenue,New York,NY 10016-5990Copyright 2021 byTHE AMERICAN SOCIETY OF MECHANICA
12、L ENGINEERSAll rights reservedTABLE OF CONTENTSList of Sections.xxivForeword.xxviStatement of Policy on the Use of the ASME Single Certification Mark and Code Authorization in AdvertisingxxviiiStatement of Policy on the Use of ASME Marking to Identify Manufactured Items.xxviiiSubmittal of Technical
13、Inquiries to the Boiler and Pressure Vessel Standards Committees.xxixPersonnel.xxxiiPreamble.liiiSummary of Changes.lvList of Changes in Record Number Order.lviiiCross-Referencing and Stylistic Changes in the Boiler and Pressure Vessel Code.lixPart PGGeneral Requirements for All Methods of Construct
14、ion.1General.1PG-1Scope.1PG-2Service Limitations.1PG-3Referenced Standards.1PG-4Units of Measure.1Materials.2PG-5General.2PG-6Plate.3PG-7Forgings.3PG-8Castings.3PG-9Pipes,Tubes,and Pressure-Containing Parts.4PG-10Material Identified With or Produced to a Specification Not Permitted byThis Section,an
15、d Material Not Fully Identified.6PG-11Prefabricated or Preformed Pressure Parts Furnished Without aCertification Mark.8PG-12Water Level Indicators and Connector Material.10PG-13Stays.11PG-14Rivets.11Design.11PG-16General.11PG-17Fabrication by a Combination of Methods.12PG-18Design Validation by Proo
16、f Test.12PG-19Cold Forming of Austenitic Materials.12PG-20Cold Forming of Carbon,Carbon-Molybdenum,and Creep StrengthEnhanced Ferritic Steels.14PG-21Maximum Allowable Working Pressure.15iiiPG-22Loadings.16PG-23Stress Values for Calculation Formulas.16PG-25Quality Factors for Steel Castings.16PG-26Weld Joint Strength Reduction Factor.18PG-27Cylindrical Components Under Internal Pressure.18PG-28Components Under External Pressure.23PG-29Dished Heads.25PG-30Stayed Dished Heads.27PG-31Unstayed Flat H