B16.9-2001 7/23/01 2:40 PM Page 1 ASME B16.9 …

1 asme N A ME R I C A N N A T I O N A LS TA N D A R DASME N A ME R I C A N N A T I O N A LS TA N D A R 7/23/01 2:40 PM Page 1AN AMERICAN NATIONALSTANDARDFACTORY-MADEWROUGHTBUTTW ELDINGFITTINGSASME 105-18-01 10:39:37 Unit: UCPT extfile: B16P9$$$CPp. 1 Date of Issuance: June 22, 2001 This Standard will be revised when the Society approves the issuance of anew edition. There will be no addenda issued to this edition. The next editionof this Standard is scheduled for publication in will issue written replies to inquiries concerning interpretation oftechnical aspects of this is the registered trademark of The American Society of Mechanical code or standard was developed under procedures accredited as meeting the criteria forAmerican National standards .

2 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 does not approve, rate, or endorse any item, construction, proprietary device,or does not take any position with respect to the validity of any patent rights asserted inconnection with any items mentioned in this document, and does not undertake to insure anyoneutilizing a standard against liability for infringement of any applicable letters patent, nor assumeany such liability.

3 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 by federal agency representative(s) or person(s) affiliated with industry is not tobe interpreted as government or industry endorsement of this code or accepts responsibility for only those interpretations of this document issued inaccordance with the established asme procedures and policies, which precludes the issuanceof interpretations by part of this document may be reproduced in any form,in an electronic retrieval system or otherwise,without the prior written permission of the American Society of Mechanical EngineersThree Park Avenue, New York, NY 10016-5990 Copyright 2001 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll Rights ReservedPrinted in 305-18-01 08:31:17 Unit: UFWT extfile.

4 B16P9$$$FWp. 3 FOREWORDIn 1921, the American Engineering standards Committee, later American StandardsAssociation (ASA), organized Sectional Committee B16 to unify and further develop nationalstandards for pipe flanges and fittings (and, later, for valves, gaskets, and valve actuators).Cosponsors of the B16 Committee were the American Society of Mechanical Engineers( asme ), the Heating and Piping Contractors National Association [now the MechanicalContractors Association of America (MCAA)], and the Manufacturers Standardization Societyof the Valve and Fittings Industry (MSS). Cosponsors were later designated as of welding fittings was initiated in 1937 by a subgroup (designatedSubgroup 6) of Subcommittee 3.

5 After consideration of several drafts, a standard wasapproved by the Committee, cosponsors, and ASA, and published with the designation were made in 1950 and 1955 to add sizes up to NPS 24 and to completecoverage of fittings in some sizes. These revisions were approved and published as and ASA With the subgroup now designated Subcommittee 6 (laterSubcommittee F), further revisions were begun to clarify the intent of the standard, to addangularity tolerances, and to include fittings of different types (long radius-reducing elbowsand crosses) and smaller sizes (NPS1 4and1 2). This revision was published as ASA after ASA reorganization of ASA, first as the United States of America standards Institute(USASI), then as the American National standards Institute (ANSI), with the SectionalCommittee being redesignated as an American National standards Committee, anotherrevision increasing the size range to NPS 48 and revising the text for clarity was approvedand published as ANSI 1975, Subcommittee F began a major revision to bring the standard up to date withcurrent practice and usage.

6 Common fractions were expressed as decimals (but withoutintending higher precision) and metric dimensional equivalents were added. Provisions forstep-wise change of radius for NPS3 4long radius elbows and 180 deg returns wereintroduced. Following standards Committee, cosecretariat, and ANSI approval, the revisionwas published as ANSI It was updated by a corrective addendum, , issued in February 1982, American National standards Committee B16 was reorganized as an ASMEC ommittee operating under procedures accredited by ANSI. In this Edition, the text hasbeen revised and inch dimensions are established as the standard.

7 Following approval bythe standards Committee and asme , approval as an American National Standard was givenby ANSI on November 12, 1986 with the new designation asme /ANSI 1991 the Subcommittee reviewed the document and made a number of for short pattern lap joints were also added to this 1993 Edition of the this 2001 Edition, short radius elbows and returns were added which includes alldimensions and tolerances of asme This Edition also provides metric unitsas an independent but parallel alternative standard to Customary units and a QualitySystem Program 405-18-01 08:31:17 Unit: UFWT extfile: B16P9$$$FWp.

8 4 Requests for interpretation or suggestions for revision should be sent to the Secretary,B16 Committee, The American Society of Mechanical Engineers, Three Park Avenue, NewYork, NY Standard was approved as an American National Standard on April 6, 505-18-01 08:31:55 Unit: UCRT extfile: B16P9$$$CRp. 5 asme standards COMMITTEE B16 Standardization of Valves, Flanges, Fittings, andGaskets(The following is the roster of the Committee at the time of approval of this Standard.)OFFICERSW. N. McLean,ChairH. R. Sonderegger,Vice ChairP. Reddington,SecretaryCOMMITTEE PERSONNELW. L. Ballis,Columbia Gas Distribution E. Batey,Union Carbide M.

9 Bell,Underwriter s Laboratory, L. Blair, Coast GuardR. R. Brodin,Fisher Controls International, Cohen,Copper Development AssociationW. C. Farrell, Jr.,ConsultantC. E. Floren,Mueller R. Frikken,Monsanto W. Garland,Frick B. Hagen,ABS AmericasJ. C. Inch,Mueller Brass S. John,J Square Engineering A. Jolly,Vogt Valve G. Knecht,Anchor/Darling Valve Koester,The William Powell H. Longacre,Nibco, H. McCauley, Jr.,James H. McCauley, N. McLean,Newco ValvesA. F. Rhodes,Arnco Technology TrustF. C. Rosch, Jr.,Techincon Enterprises, A. Schmidt,Ladish R. Sonderegger,Tyco Flow ControlW. M. Stephan,Flexitallic F. Stroud,Ductile Iron Pipe Research AssociationR.

10 E. White,Repairs, A. Williams,Southern Company ServicesL. A. Willis,Dow Chemical F STEEL THREADED ANDWELDING FITTINGSG. A. Jolly,Chairman, Vogt Valve J. Rossi,Secretary, The American Society of Mechanical EngineersP. R. Benavides,Tube Forgings of American, A. Cuccio,Capitol ManufacturingJ. P. Ellenberger,WFI InternationalD. R. Frikken,Monsanto 605-18-01 08:31:55 Unit: UCRT extfile: B16P9$$$CRp. 6R. E. Johnson,ConsultantR. C. Lafferty,Penna Machine Works, H. Monroe,ConsultantR. A. Schmidt,Ladish R. Sonderegger,Tyco Flow ControlL. A. Willis,Dow Chemical R. Worley,Union Carbidevip. 705-18-01 08:32:13 Unit: UCTT extfile: B16P9$$$CTp. of of of Proof of Test Production 805-18-01 08:32:13 Unit: UCTT extfile: B16P9$$$CTp.