BPVC_2021_Section_VII.pdf

Recommended Guidelinesfor the Care of Power BoilersSECTION VIIASME BPVC.VII-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.VIIRECOMMENDED GUIDELINESFOR THE CARE OF POWERBOILERSASME Boiler and Pressure Vessel Committeeon Power 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 forAmerican National Standards and it is an American National Standard.The Standards Committee that approvedthe code or standard was balanced to assure that individuals from competent and concerned interests have had anopportunitytoparticipate.Theproposedcodeor standardwasmadeavailable forpublicreview andcommentthatprovidesanopportunityforadditionalpublicinputfromindustry,academia,regulatoryagencies,andthepublic-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 anyitemsmentionedinthisdocument,anddoesnotundertaketoinsureanyoneutilizingastandardagainstliabilityforinfringementofanyapplicableletterspatent,norassumeanysuchliability.Usersofacodeorstandardareexpresslyadvised that determination of the validity of any such patent rights,and the risk of infringement of such rights,isentirely their own responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not to be interpreted asgovernment or industry endorsement of this code or standard.ASME acceptsresponsibilityforonlythoseinterpretations ofthisdocument issuedin accordance withtheestab-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.viiiForeword.xStatement of Policy on the Use of the ASME Single Certification Mark and Code Authorization in AdvertisingxiiStatement of Policy on the Use of ASME Marking to Identify Manufactured Items.xiiSubmittal of Technical Inquiries to the Boiler and Pressure Vessel Standards Committees.xiiiPersonnel.xviOrganization of Section VII.xxxviiSummary of Changes.xxxixList of Changes in Record Number Order.xlCross-Referencing and Stylistic Changes in the Boiler and Pressure Vessel Code.xliSUBSECTION 1WATERTUBE DRUM-TYPE INDUSTRIAL STEAM BOILERS.1Article 100Fundamentals of Watertube Boilers.1100.1Steam Generation.1100.2Watertube Boilers.1100.3Steam Drums.1100.4Economizers.4100.5Superheaters.6100.6Combustion.6100.7Boiler Efficiency and Air Emissions.7Article 101Boiler Operation.8101.1General Guidelines.8101.2Preparing for Operation.10101.3Starting Up.13101.4Online Operation.14101.5Out-of-Service Operation.18Article 102Boiler Auxiliaries.21102.1Preparation of Auxiliaries for Service.21102.2Fuel-Burning Equipment.21102.3Air Heaters.26102.4Boiler Feed Pumps.29102.5Auxiliary Drives.30102.6Draft Fans.35102.7Dampers.35Article 103Appurtenances.37103.1Boiler Pressure Relief Valves.37103.2Pressure Relief Valves for Economizers and Auxiliaries.44103.3Transportation and Installation of Pressure Relief Valves.45iii103.4Water Columns,Gage Glasses,and Level Transmitters.46103.5Boiler Blowdown.48103.6Pressure Gages.49103.7Feedwater Regulator Valve.49103.8Soot Blowers.50103.9Fusible Plugs.50Article 104Instrumentation,Controls,and Interlocks.52104.1General.52104.2Indicators and Recorders.52104.3Water-Level Indication.53104.4Controls and Interlocks.53Article 105Examinations.561