20-1_Edtn_2009.pdf

AN AMERICAN NATIO NAL STANDARDSafety Standard for Conveyors and Related EquipmentASME B20.1-2009(Revision of ASME B20.1-2006)Copyright 2009 by the American Society of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.cCopyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.ASME B20.1-2009(Revision of ASME B20.1-2006)Safety Standardfor Conveyorsand RelatedEquipmentAN AMERICAN NATIONAL STANDARDCopyright 2009 by the American Society of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.cCopyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.Date of Issuance:March 16,2009The next edition of this Standard is scheduled for publication in 2012.This Standard will becomeeffective 1 year after the Date of Issuance.There will be no addenda issued to this edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisStandard.Interpretations are included with each edition.Interpretations are also published on theASME Web site under the Committee Pages at http:/cstools.asme.org as they are issued.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria for American NationalStandards.The Standards Committee that approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an opportunity to participate.The proposed code or standard was madeavailable forpublic review andcomment thatprovides an opportunityfor additional publicinput from industry,academia,regulatory agencies,and the public-at-large.ASME does not“approve,”“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 anyitems mentioned in this document,and does not undertake to insure anyone utilizing a standard against liability forinfringement of any applicable letters patent,nor assume any such liability.Users of a code or standard are expresslyadvised 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 accepts responsibility for only those interpretations of this document issued in accordance with the establishedASME procedures and policies,which precludes the issuance of interpretations by individuals.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 Mechanical EngineersThree Park Avenue,New York,NY 10016-5990Copyright 2009 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.Copyright 2009 by the American Society of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.cCopyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.CONTENTSForeword.ivCommittee Roster.viSummary of Changes.viiIntroduction.11Scope.12Reference to Other Codes.13Intent.14Definitions.25General Safety Standards.66Specific Safety Standards.9iiiCopyright 2009 by the American Society of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.cCopyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.FOREWORDThe first edition of the Safety Standard for Conveyors,Cableways,and Related Equipmentwas sponsored by the National Conservation Bureau and the American Society of MechanicalEngineers.It was approved by the American Standards Association(now known as the AmericanNational Standards Institute,Inc.)as American Standard B20.1-1947.In 1950,the Sectional Committee B20 was reorganized under the sponsorship of the AccidentPrevention Department of the Association of Casualty and Surety Companies and the AmericanSocietyofMechanicalEngineers.FourSubcommitteeswereformedtomakespecificrecommenda-tions for revisions.These were:Subcommittee No.1 Scope and IntentSubcommittee No.2 Nomenclature and DefinitionsSubcommittee No.3 Portable ConveyorsSubcommittee No.4 Conveyors in GeneralSe