ASME_B20.1-2021.pdf

AN AM E R ICAN NAT IO NAL STANDARDASME B20.1-2021(Revision of ASME B20.1-2018)Safety Standard for Conveyors and Related EquipmentASME B20.1-2021(Revision of ASME B20.1-2018)Safety Standardfor Conveyorsand RelatedEquipmentAN AMERICAN NATIONAL STANDARDTwo Park Avenue New York,NY 10016 USAxDate of Issuance:August 31,2021ThenexteditionofthisStandardisscheduledforpublicationin2024.ThisStandardwillbecomeeffective1yearaftertheDateofIssuance.ASME issues written replies to inquiries concerning interpretations of technical aspects of this Standard.Interpretations arepublished on the ASME website under the Committee Pages at http:/cstools.asme.org/as they are issued.Errata to codes and standards may be posted on the ASME website under the Committee Pages to provide corrections toincorrectlypublisheditems,ortocorrecttypographicalorgrammaticalerrorsincodesandstandards.Sucherratashallbeusedon the date posted.TheCommitteePagescanbefoundathttp:/cstools.asme.org/.Thereisanoptionavailabletoautomaticallyreceiveane-mailnotification when errata are posted to a particular code or standard.This option can be found on the appropriate CommitteePage after selecting“Errata”in the“Publication Information”section.ASME is the registered trademark of The American Society of Mechanical Engineers.ThiscodeorstandardwasdevelopedunderproceduresaccreditedasmeetingthecriteriaforAmericanNationalStandards.TheStandardsCommitteethatapprovedthecodeorstandardwasbalancedtoassurethatindividualsfromcompetentandconcernedinterestshavehadanopportunityto participate.The proposed codeorstandardwasmadeavailable forpublic reviewandcommentthatprovidesanopportunityfor additional public input 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 any items mentioned in thisdocument,anddoesnotundertaketoinsureanyoneutilizingastandardagainstliabilityforinfringementofanyapplicableletterspatent,norassumeanysuchliability.Usersofacodeorstandardareexpresslyadvisedthatdeterminationofthevalidityofanysuchpatentrights,andtherisk 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 industryendorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the established ASME proceduresand 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 EngineersTwo Park Avenue,New York,NY 10016-5990Copyright 2021 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.ivCommittee Roster.viCorrespondence With the B20 Committee.viiIntroduction.ixSummary of Changes.x1Scope.12References.13Intent.24Definitions.25General Safety Standards.76Specific Safety Standards.10Mandatory AppendixISpecifications for Design,Installation,Commissioning,and Periodic Inspection of VerticalReciprocating Conveyors.17FiguresI-3.1-1Cantilever Design.17I-3.1-2Straddle Design.18I-3.1-3Four-Post Design.18I-3.9.2-1Single-Swing Hinged Gate.19I-3.9.2-2Biparting,Double-Swing Hinged Gates.19I-3.9.2-3Vertical Rising Gates.19I-3.9.2-4Horizontal Sliding Gate.19I-3.9.2-5Roll-Up Type Door(Gate).20iiiFOREWORDThe first edition of the Safety Standard for Conveyors,Cableways,and Related Equipment was sponsored by theNational Conservation Bureau and The American Society of Mechanical Engineers(ASME).It was approved by theAmericanStandardsAssociationnowknownastheAmericanNationalStandardsInstitute(ANSI)asAmericanStandardB20.1-1947.In1950,theSectionalCommitteeB20wasreorganizedunderthesponsorshipoftheAccidentPreventionDepartmentoftheAssociationofCasualtyandSuretyCompaniesandASME.ThefollowingfourSubcommitteeswereformedtomakespecific recommendations for revisions:Subcommittee No.1:Scope and IntentSubcommittee No.2:Nomenclature and DefinitionsSubcommittee No.3:Portable ConveyorsSubcommittee No.4:Conveyors in GeneralThedefinitionssectionwasbasedontheconveyorindustrydictionary,ConveyorTermsandDefinitions,aspreparedbythe Technical Committee(now the Engineering Conference)of the Conveyor Equipment Manufacturers Association(CEMA).The second edition of this Standard,dated April 1955,was submitted in draft form to the Sectional Committee forapproval and distributed to industry in general for criticism and comment.Approval was then given by the SectionalCommittee,the sponsors,and the American Standards Association.The Standard was designated as American StandardB20.1-1957 on December 4,1957.In1967,thethirdeditionoftheSafetyStandard forConveyorsand RelatedEquipment wassubmit