ASME_B29-24-2002.pdf

Copyrighted 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.AN AMERICAN NA TIONALST ANDARDROLLER LOAD CHAINS FOROVERHEAD HOISTSASME B29.24-2002(Revision of ASME B29.24M-1995)Copyrighted 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:September 26,2002This Standard will be revised when the Society approves the issuance ofa new edition.There will be no addenda or written interpretations of therequirements of this Standard issued to this Edition.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 forAmerican National Standards.The Standards Committee that approved the code or standardwas balanced to assure that individuals from competent and concerned interests have had anopportunity to participate.The proposed code or standard was made available for public reviewand comment that provides an opportunity for 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 inconnection withany itemsmentioned inthis document,and doesnot undertaketo insureanyoneutilizing a standardagainst liability for infringementof any applicable letterspatent,nor assumesany such liability.Users of a code or standard are expressly advised that determination of thevalidity of any such patent rights,and the risk of infringement of such rights,is entirely theirown responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not tobe interpreted as government or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued inaccordance with the established ASME procedures and policies,which precludes the issuanceof 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 2002 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll Rights ReservedPrinted in U.S.A.Copyrighted 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.vCorrespondence With the B29 Committee.vi1Scope.12Purpose.13Roller Load Chains.13.11Nomenclature.3.21General Proportions.3.31Numbering System.3.41Minimum Ultimate Tensile Strength.3.51Length Tolerance.3.64Measuring Load.3.74Preload.3.84General Chain Dimensions.4Roller Chain Inspection,Replacement,and Maintenance.44.14Chain Inspection.4.27Maintenance.4.38Replacement of Load Chain.Figures1Typical Hoist Roller Load Chain.22Overhead Hoist.43Elongation Measurement.54Illustration of Camber and Twist.55Hook.66Pin Turning.67Inspection of Chain Rollers.78Inspection for Tight Joints.7Table1General Load Chain Dimensions.3iiiCopyrighted 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.FOREWORDA number of specialized roller chains are made and supplied to original equipmentmanufacturers for use as load chains on overhead hoists.Although these chains are ofsimilar design and construction,and are usually dimensionally interchangeable with equivalentpitch ANSI B29.1,Power Transmission Roller Chains,they differ in that they are normallymade using select steels and/or specially treated chain parts to provide for the higher tensileand fatigue strength properties required to meet the rate load capacitites of the overheadhoists in which they are used.Hoist load chains are consequently assigned special chain numbers to distinguish themfrom equivalent pitch B29.1 or other roller chains,which even if dimensionaly interchangeable,may not have the necessary strength or special characteristics for replacement of the originalhoist load chain.It was recognized by the Roller Chain Technical Committee of the American ChainAssociation that a potential risk of personal injury could occur as a result of chain failureif the original load chiain was inadvertently replaced by a lower strenght chain,or if properuse,care,and maintenace procedures were not followed.Consequently,a committee wasformed in October 1978 to prepare a standared for chains used in overhead hoists