Forged Fittings, Socket-Welding and Threaded

1 AN AMERICAN NATIONAL STANDARD ASME (Revision of ASME ) Forged Fittings, Socket-Welding and ThreadedCopyright 2012 by the American Society of Mechanical reproduction may be made of this material without written consent of ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS--`,,```,,,,````-`-`,,`,,`,`,,`---//^ :^^#^~^^"~~:~"~$$"~$^"#:*~~@^~@#"@^~~*:# *:^$:$~:*"\\Copyright 2012 by the American Society of Mechanical reproduction may be made of this material without written consent of ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS--`,,```,,,,````-`-`,,`,,`,`,,`---//^ :^^#^~^^"~~:~"~$$"~$^"#:*~~@^~@#"@^~~*:# *:^$:$~.

2 *"\\ASME (Revision of ASME ) Forged Fittings, Socket-Weldingand ThreadedAN AMERICAN NATIONAL STANDARDT hree Park Avenue New York, NY 10016 USAC opyright 2012 by the American Society of Mechanical reproduction may be made of this material without written consent of ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS--`,,```,,,,````-`-`,,`,,`,`,,`---//^ :^^#^~^^"~~:~"~$$"~$^"#:*~~@^~@#"@^~~*:# *:^$:$~:*"\\Date of Issuance: January 30, 2012 The next edition of this Standard is scheduled for publication in issues written replies to inquiries concerning interpretations of technical aspects of thisStandard.

3 Periodically certain actions of the ASME B16 Committee may be published as and interpretations are published on the ASME Web site under the Committee Pages as they are issued, and will be published within the next edition of to codes and standards may be posted on the ASME Web site under the Committee Pages toprovide corrections to incorrectly published items, or to correct typographical or grammatical errorsin codes and standards. Such errata shall be used on the date Committee Pages can be found at There is an option available toautomatically receive an e-mail notification when errata are posted to a particular code or option can be found on the appropriate Committee Page after selecting Errata in the PublicationInformation is the registered trademark of The American Society of Mechanical code or standard was developed under procedures accredited as meeting the criteria for American NationalStandards.

4 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 for public review and 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 in connection with anyitems mentioned in this document.

5 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 by federal agency representative(s) or person(s) affiliated with industry is not to be interpreted asgovernment or industry endorsement of this code or 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 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.

6 NY 10016-5990 Copyright 2012 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in 2012 by the American Society of Mechanical reproduction may be made of this material without written consent of ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS--`,,```,,,,````-`-`,,`,,`,`,,`---//^ :^^#^~^^"~~:~"~$$"~$^"#:*~~@^~@ ivCommittee viCorrespondence With the B16 viiSummary of and 12 Pressure 13 Size and 87 Additional 98 Proof 9 Figures1 Method of Designating Outlets of Reducing Tees and 82 welding Gap and Minimum Flat Dimensions for Socket-Welding 9 Tables1 Socket-Welding 22 Forged Threaded 33 Forged Threaded Fittings Street 44 Threaded 55 Plugs and 66 Types of Fittings by Class Designation and NPS Size 77 Correlation of

7 Fittings Class With Schedule Number or Wall Designation ofPipe for Calculation of 78 Nominal Wall Thickness of Schedule 160 and Double Extra Strong 7 Mandatory AppendicesI Dimensions of Fittings in Customary 11II 17 Nonmandatory AppendixA Quality System 18iiiCopyright 2012 by the American Society of Mechanical reproduction may be made of this material without written consent of ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS--`,,```,,,,````-`-`,,`,,`,`,,`---//^ :^^#^~^^"~~:~"~$$"~$^"#:*~~@^~@#"@^~~*:# *:^$:$~:*"\\FOREWORDThe Sectional Committee on the Standardization of Pipe Flanges and Fittings, B16, organizedin 1920 under the procedure of the American Standards Association (ASA), appointed a subgroupof Subcommittee 3 (now Subcommittee F) to initiate the standardization of welding fittings inMay 1937.

8 The first meeting of this group was held later that month, and at its meeting inDecember 1938, in New York, it was agreed to undertake the standardization of dimensions ofsocket- welding fittings and to refer this project to a new drafting subgroup. One of the mostimportant dimensions of this type of fitting requiring standardization was considered to be thedimension from the centerline of the fitting to the bottom of the socket, since from the standpointof the designing engineer, this dimension governs the location of adjacent pipe with referenceto the entire piping layout.

9 Another important item for consideration was the welding drafting subgroup held meetings in Chicago, Detroit, and New York in March 1939 andMay and October 1940, respectively, and at the last named meeting, the completed draft of theproposed standard was discussed, and further revisions were suggested. When applied to theSeptember 1940 draft, these changes produced the May 1941 draft, which was prepared fordistribution to industry for criticism and distribution resulted in a number of helpful comments. The members of the subgroupagreed by mail that many of the changes suggested should be incorporated in the revised draft(December 1941).

10 Progress on the approval of the standard was delayed by the World War II,after which, a few more changes were added to make the proposal acceptable to all revised draft (April 1946) was then submitted to the members of the sectional committeefor letter ballot the approval of the sectional committee, the proposed standard was next approvedby the sponsor bodies and presented to the ASA with recommendation for approval as anAmerican Standard. This designation was given on December 9, 1960, it was agreed that the standard needed a complete revision and simultaneously thatit should be expanded to cover Threaded fittings and plugs, then covered by MSS SP-49 andSP-50.