1、Summary of Significant Changes in the2021 ASME Boiler and Pressure Vessel CodeASME BPVC.SSC.IV.II.V.IX-2021Section IVSection IISection VSection IXASME BPVC.SSC.IV.II.V.IX-2021Summary ofSignificant Changesin the 2021 ASMEBoiler and PressureVessel CodeSections IV,II,V,and IXTwo Park Avenue New York,NY
2、 10016 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 Me
3、chanical 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 IV.1Introduction.1Significant Changes.2S
4、ECTION II.5Introduction.5Part A.6Part B.10Part C.13Part DCustomary and Metric.15SECTION V.19Introduction.19Significant Changes.20SECTION IX.25Introduction.25Significant Changes.28iiiLIST OF SECTIONSIN THE ASME BOILER AND PRESSURE VESSEL CODEIRules for Construction of Power BoilersIIMaterials Part A
5、Ferrous 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
6、 1 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 Transport
7、ation 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 Boiler
8、sVIIIRules 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 C
9、omponents 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 Protectio
10、nivFOREWORDThisbookisacompaniontothe2021ASMEBoilerandPressureVesselCode(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 IV Section II,Parts A,B,C,and D Secti
11、on 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 an
12、d the 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:Carlton R.Ramcharran,S&C Project Engineering Advisor,Sections IV and V Colleen E.Rodrigues,S&C Project
13、Engineering Manager,Section II,Parts A,B,and D Erika Lawson,S&C Project Engineer,Section II,Part C;and Section IXASMEPresssOnlineCompanionGuidetotheASMEBoilerandPressureVesselCodes:CriteriaandCommentaryonSelectAspects of the Boiler&Pressure Vessel and Piping Codes(January 2020)provided source materi
14、al 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 volunteer committees,who are responsible for devel-
15、opment of the ASME Boiler and Pressure Vessel Code Sections noted in this book:BPV Committee on Heating Boilers(IV)BPV Committee on Materials(II)BPV Committee on Nondestructive Examination(V)BPV Committee on Welding,Brazing,and Fusing(IX)viSECTION IVIntroductionSection IV of the ASME Boiler and Pres
16、sure Vessel Code(BPVC)provides requirements for the design,fabrication,installation,and inspection ofsteam heating,hot water heating,and hot water supply boilers that are directly fired withoil,gas,electricity,coal,or other solid or liquid fuels,and for operation of these boilers at or below the pressure andtemperaturelimitssetforthinSectionIV.Similarrequirementsforpotablewaterheatersarealsoincluded.SectionIVisdivided into five Parts.Part HG covers general requirements for all materials and cons
