BPVC_2021_Section_IV.pdf

Rules for Constructionof Heating BoilersSECTION IVASME BPVC.IV-20212021ASME Boiler andPressure Vessel CodeAn International CodeMarkings 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 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-accreditaon.)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.IVRULES FOR CONSTRUCTIONOF HEATING BOILERSASME Boiler and Pressure Vessel Committeeon Heating BoilersTwo Park Avenue New York,NY 10016 USAAN INTERNATIONAL CODE2021 ASME Boiler&Pressure Vessel CodeJuly 1,20212021 EditionDate 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 Standard.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 additional 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 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 assume any such liability.Users of a code or standard are expressly advised that determination of the validity of any such patent rights,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 those 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 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 Congress 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 MECHANICAL ENGINEERSAll rights reservedTABLE OF CONTENTSList of Sections.xivForeword.xviStatement of Policy on the Use of the ASME Single Certification Mark and Code Authorization in AdvertisingxviiiStatement of Policy on the Use of ASME Marking to Identify Manufactured Items.xviiiSubmittal of Technical Inquiries to the Boiler and Pressure Vessel Standards Committees.xixPersonnel.xxiiPreamble.xliiiSummary of Changes.xlivList of Changes in Record Number Order.xlviiiCross-Referencing and Stylistic Changes in the Boiler and Pressure Vessel Code.xlixPART HGGENERAL REQUIREMENTS FOR ALL MATERIALS OF CONSTRUCTION.1Article 1Scope and Service Restrictions.1HG-100Scope.1HG-101Service Restrictions.1HG-102Units.1HG-103Tolerances.2Article 2Material Requirements.3HG-200General Material Requirements.3HG-201Specific Material Requirements.3Article 3Design.4HG-300Design Pressure.4HG-301Cylindrical Parts Under Internal Pressure.4HG-305Formed Heads,Pressure on Concave Side.4HG-306Formed Heads,Pressure on Convex Side.5HG-307Flat Heads.5HG-309Spherically Dished Covers(Bolted Heads).9HG-312Cylindrical Parts Under External Pressure.11HG-320Openings in Boilers,General Requirements.14HG-321Reinforcement Required for Openings in Shells and Formed Heads.15HG-323Flanged-In Openings in Formed Heads.16HG-325Reinforcement Required for Openings in Flat Heads.16HG-326Limits of Metal Available for Reinforcement.17HG-327Strength of Reinforcement.19HG-328Reinforcement for Multiple Openings.19HG-330Inspection and Access Openings.21HG-340Stayed Surfaces.22HG-341Staybolts.23iiiHG-342Dimensions of Stays.23HG-343Dimensions of Diagonal Stays.25HG-345Staying of Heads.25HG-346Tubesheets With Firetubes Used as Stays.