ASME_B16.5-2020.pdf

Pipe Flanges and Flanged Fittings NPS Through NPS 24 Metric/Inch StandardAN AM E R ICAN NAT IO NAL STANDARDASME B16.5-2020(Revision of ASME B16.5-2017)ASME B16.5-2020(Revision of ASME B16.5-2017)Pipe Flanges andFlanged FittingsxNPS12Through NPS 24Metric/Inch StandardAN AMERICAN NATIONAL STANDARDxDate of Issuance:January 29,2021The next edition of this Standard is scheduled for publication in 2024.ASME issues written replies to inquiries concerning interpretations of technical aspects of this Standard.Periodically certainactionsoftheASMEB16CommitteemaybepublishedasCases.CasesandinterpretationsarepublishedontheASMEwebsiteunder 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.viiiCommittee Roster.xCorrespondence With the B16 Committee.xiSummary of Changes.xiiiList of Changes in Record Number Order.xvi1General.12PressureTemperature Ratings.23Component Size.34Marking.45Materials.46Dimensions.87Tolerances.138Pressure Testing.14Mandatory AppendicesIThreading of Pipe for American National Standard Threaded Flanges.189IIReferences.191Nonmandatory AppendicesAMethod Used for Establishing PressureTemperature Ratings.194BLimiting Dimensions of Gaskets Other Than Ring Joint Gaskets.198CMethod for Calculating Bolt Lengths.200DQuality System Program.202EDimensions of Classes 400,600,900,1500,and 2500 Flanged Fittings in U.S.Customary Units203FMethod Used to Establish SI Unit Values.231Figures1Bevel for Outside Thickness.152Bevel for Inside Thickness.153Bevel for Combined Thickness.154Straight Hub Welding Flanges.155Method of Designating Outlets of Reducing Fittings in Specifications(Flanged Fittings).166EndFlangeFacingsandTheirRelationshiptoFlangeThicknessandCenter-to-EndandEnd-to-EndDimensions.177WeldingNeckFlangeHubandWeldingEndProfilesforWallThicknessestFrom5mm(0.19in.)to22 mm(0.88 in.).198Welding Neck Flange Hub and Welding End Profiles for Wall Thicknesses t Greater Than 22 mm(0.88 in.).20iii9Inside Contour for Use With Rectangular Backing Ring.2110Inside Contour for Use With Taper Backing Ring.2111Thread Length for Connection Tapping.2212Socket Welding for Connections.2213Bosses for Connections.2214Butt Welding for Connections.2215Method of Designating Location of Auxiliary Connections When Specified(Flanged Fittings).23C-1Specified Machine Bolt Length.200C-2Specified Stud Bolt Length.200Tables1.1-1List of Material Specifications.51.1-2List of Bolting Specifications:Applicable ASTM Specifications.91.1-3Flange Bolting Dimensional Recommendations.122-1.1PressureTemperature Ratings for Group 1.1 Materials.242-1.1CPressureTemperature Ratings for Group 1.1 Materials.252-1.2PressureTemperature Ratings