-21M_R2003_E1996.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.REAFFIRMED 2003FOR CURRENT COMMITTEE PERSONNELPLEASE E-MAIL CSasme.orgA The American Society of Mechanical Engineers N A M E R I C A N N A T I O N A L S T A N D A R D 700 CLASS WELDED STEEL AND CAST CHAINS,ATTACHMENTS AID SPROCKETS FOR WATER AND SEWAGE TREATMENT PLANTS ASME B29.21 M-1996(Revision of A N S I 829.21 M-1981)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:May 3,1996 This Standard will be revised when the Society approves the issuance of a new edition.There will be no addenda or written interpretations of the requirements 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 for American National Standards.The Consensus 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 which 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 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 representativek)or personk)affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard.ASME accepts responsibilityfor only those interpretations issued in accordance with governing ASME procedures and policies which preclude the issuance of interpretations by individual volunteers.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.Copyright 0 1996 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS 345 East 47 Street,New York,N.Y.10017 All Rights Reserved Printed in USA.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.FOREWORD(This Foreword is not part of ASME B29.21M-1996.)An ANSI B29 Subcommittee was established in 1975 to develop a standard which would aid municipalities and others in specifying chains for water and sewage treatment plants.This Standard is the result of that effort.Previous ANSI chain standards have covered dimensions which assured interchangeability and listed ultimate strengths.This Standard serves a dual purpose.It was developed to assure consistency with previous standards and does replace ANSI B29.13-1972.However,it also contains a supplementary section which is unique to ANSI B29 standards.The supplement identifies“Engineering Characteristics”of 700 Class Welded Steel and Cast Chain including attachments and sprockets in common use for rectangular straight line collectors in water and sewage treatment tanks.“Engineering Characteristics”as used in this Standard identify those properties of the chains,attachments and sprockets which are required to assure that they will operate successfully.Use of this Standard and supplement offers sufficient information to use as a minimum or base requirement when specifying chain attachments and sprockets for water and sewage treat-ment plants.The Standard specifies a minimum chain “quality”.The user must identify those options,not affecting chain “quality”,but which do describe the chain features for a specific application.User specifications should include the following:-Chain type and number-Attachment and spacing-Pin and cotter or riveted-Pearlitic malleable-cast chain-Heat treated or nonheat treated (welded steel chain only)-Destructive tests,if any-Sprocket construction details-Special materials or plating-Shipping Instructions In the event that any chain,attachment or sprocket produced in accordance with this Standard does not comply with the listed“Engineering Characteristics”of the supplement for new and unused chain,it would be anticipated that the supplier would like an appropriate corrective actio