1、Summary of Significant Changes in the2021 ASME Boiler and Pressure Vessel CodeASME BPVC.SSC.I.II.V.IX-2021Section ISection IISection VSection IXASME BPVC.SSC.I.II.V.IX-2021Summary ofSignificant Changesin the 2021 ASMEBoiler and PressureVessel CodeSections I,II,V,and IXTwo Park Avenue New York,NY 100
2、16 USAxDate of Issuance:April 23,2021ASME does not issue written replies to inquiries concerning this publication.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 Mechan
3、ical EngineersTwo Park Avenue,New York,NY 10016-5990Copyright 2021 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSList of Sections in the ASME Boiler and Pressure Vessel Code.ivForeword.vAcknowledgments.viSECTION I.1Introduction.1Significant Changes.2SECTIO
4、N II.10Introduction.10Part A.11Part B.15Part C.18Part DCustomary and Metric.20SECTION V.24Introduction.24Significant Changes.25SECTION IX.30Introduction.30Significant Changes.33iiiLIST OF SECTIONSIN THE ASME BOILER AND PRESSURE VESSEL CODEIRules for Construction of Power BoilersIIMaterials Part A Fe
5、rrous Material Specifications Part B Nonferrous Material Specifications Part C Specifications for Welding Rods,Electrodes,and Filler Metals Part D Properties(Customary)Part D Properties(Metric)IIIRules for Construction of Nuclear Facility Components Subsection NCA General Requirements for Division 1
6、 and Division 2 Appendices Division 1 Subsection NB Class 1 Components Subsection NCD Class 2 and Class 3 Components Subsection NE Class MC Components Subsection NF Supports Subsection NG Core Support Structures Division 2 Code for Concrete Containments Division 3 Containment Systems for Transportat
7、ion and Storage of Spent Nuclear Fuel and High-LevelRadioactive Material Division 5 High Temperature ReactorsIVRules for Construction of Heating BoilersVNondestructive ExaminationVIRecommended Rules for the Care and Operation of Heating BoilersVIIRecommended Guidelines for the Care of Power BoilersV
8、IIIRules for Construction of Pressure Vessels Division 1 Division 2 Alternative Rules Division 3 Alternative Rules for Construction of High Pressure VesselsIXWelding,Brazing,and Fusing QualificationsXFiber-Reinforced Plastic Pressure VesselsXIRules for Inservice Inspection of Nuclear Power Plant Com
9、ponents Division 1 Rules for Inspection and Testing of Components of Light-Water-Cooled Plants Division 2 Requirements for Reliability and Integrity Management(RIM)Programs for Nuclear PowerPlantsXIIRules for Construction and Continued Service of Transport TanksXIIIRules for Overpressure Protectioni
10、vFOREWORDThisbookisacompaniontothe2021ASMEBoilerandPressureVesselCode(BPVC).Itexplainsonlysignificantchangesto Code requirements that have been approved since 2019 and that will be published in the 2021 Edition.It covers thefollowing ASME BPVC Sections:Section I Section II,Parts A,B,C,and D Section
11、V Section IXForeachoftheaboveSections,anIntroductiondescribesthehistoricalbackground,scopeofcoverage,andcommercialapplication of that Section by industry and government organizations.The list of changes follows the Introduction.The“Explanation”for each change provides the reason for the action and t
12、he value to the Code user.The sequence of thechanges follows the order of the Code requirements.vACKNOWLEDGMENTSThis book is the work of the following ASME Standards and Certification(S&C)staff:Umberto DUrso,S&C Project Engineering Advisor,Section I Colleen E.Rodrigues,S&C Project Engineering Manage
13、r,Section II,Parts A,B,and D Erika Lawson,S&C Project Engineer,Section II,Part C;and Section IX Carlton R.Ramcharran,S&C Project Engineering Advisor,Section VASMEPresssOnlineCompanionGuidetotheASMEBoilerandPressureVesselCodes:CriteriaandCommentaryonSelectAspects of the Boiler&Pressure Vessel and Pip
14、ing Codes(January 2020)provided source material for the Introductionpreceding each list of changes.The complete Guide is available in the ASME Digital Collection athttps:/asmedigitalcollection.asme.org/ebooks/pages/onlinecompanionguide.ASME gratefully acknowledges the members of the following volunt
15、eer committees,who are responsible for devel-opment of the ASME Boiler and Pressure Vessel Code Sections noted in this book:BPV Committee on Power Boilers(I)BPV Committee on Materials(II)BPV Committee on Nondestructive Examination(V)BPV Committee on Welding,Brazing,and Fusing(IX)viSECTION IIntroduct
16、ionSectionIcoversrulesfornewconstructionofpowerboilers,electricboilers,miniatureboilers,high-temperaturewaterboilers,heatrecoverysteamgenerators,solarreceiversteamgenerators,certainfiredpressurevessels,andliquidphasethermal fluid heaters to be used in stationary service,and includes power boilers used in locomotive,portable,andtraction service.The scope of Section I applies to the boiler proper and to the boiler external piping.It also includespressure vessels in which an organic fluid is vapori