Edtn_2005.pdf

AN AMERICAN NATIO NAL STANDARDGray Iron Pipe Flanges and Flanged Fittings(Classes 25,125,and 250)ASME B16.1-2005(Revision of ASME B16.1-1998)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.ASME B16.1-2005(Revision of ASME B16.1-1998)Gray Iron PipeFlanges andFlanged Fittings(Classes 25,125,and 250)AN AMERICAN NATIONAL STANDARDThree Park Avenue New York,NY 10016Copyrighted 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:August 31,2006The next edition of this Standard is scheduled for publication in 2010.There will be no addenda orwritten 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 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 assumes 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 2006 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.vCommittee Roster.viiCorrespondence With the B16 Committee.viii1Scope.12PressureTemperature Ratings.13Size.24Marking.25Materials.26Fitting Dimensions and Tolerances.27Bolt,Nut,and Gasket Dimensions.48Hydrostatic Tests.49Certifications.4Figures1Method of Designating Outlets of Reducing Fittings in Specifications.62Class 25 Flanges.73Class 25 Flanged Fittings.84Class 125 Flanges.105Class 125 Flanged Fittings.126Class 250 Flanges.177Class 250 Flanged Fittings.198Class 125 Tees(Anchorage Bases).249Class 250 Tees(Anchorage Bases).2610Drain Connections.2811Method of Designating Location of Tapped Holes for Drains When Specified.29Tables1PressureTemperature Ratings.52Class 25 Flange and Bolting Dimensions.73Dimensions of Class 25 Gray Iron Flanged Fittings.94Class 125 Flange and Bolting Dimensions.115Dimensions of Class 125 Gray Iron Flanged Fittings.146Class 250 Flange and Bolting Dimensions.187Dimensions of Class 250 Gray Iron Flanged Fittings.218Dimensions of Anchorage Bases for Straight and Reducing Class 125 Tees.259Dimensions of Anchorage Bases for Straight and Reducing Class 250 Tees.2710Minimum Thread Length.28iiiCopyrighted 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.Mandatory AppendicesIDimensions of Fittings in U.S.Customary Units.31IIReferences.57Nonmandatory AppendixAQuality System Program.58ivCopyrighted 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.FOREWORDIn 1894,the American Society of Mechanical Engineers(ASME)adopted a standard flangetemplate(“ASME Standard”)for low-pressure service.A“Manufacturers Standard”for pressuresup to 250 psi followed in 1901.Around 1910,a group of fittings manufacturers form