A 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 ASME B16 25 2012 (Revision of ASME B16 25 2007) Buttwelding Ends INTENTIONALLY LEFT BLANK ASME B16 25 2012 (Revision of ASME B16 25 2007) Buttweldin[.]
ASME B16.25-2012 (Revision of ASME B16.25-2007) Buttwelding Ends A N A M E R I C A N N AT I O N A L STA N DA R D ASME B16.25-2012 (Revision of ASME B16.25-2007) Buttwelding Ends A N A M E R I C A N N AT I O N A L S TA N D A R D Three Park Avenue • New York, NY • 10016 USA Date of Issuance: December 20, 2012 The next edition of this Standard is scheduled for publication in 2017 ASME issues written replies to inquiries concerning interpretations of technical aspects of this Standard Periodically certain actions of the ASME B16 Committee may be published as Cases Cases and interpretations are published on the ASME Web site under the Committee Pages at http://cstools.asme.org/ as they are issued Errata to codes and standards may be posted on the ASME Web site under the Committee Pages to provide corrections to incorrectly published items, or to correct typographical or grammatical errors in codes and standards Such errata shall be used on the date posted The Committee Pages can be found at http://cstools.asme.org/ There is an option available to automatically receive an e-mail notification when errata are posted to a particular code or standard This option can be found on the appropriate Committee Page after selecting “Errata” in the “Publication Information” section 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 Standards 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 that 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 representative(s) or person(s) affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard ASME accepts responsibility for only those interpretations of this document issued in accordance with the established ASME 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 Engineers Three Park Avenue, New York, NY 10016-5990 Copyright © 2012 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All rights reserved Printed in U.S.A CONTENTS Foreword Committee Roster Correspondence With the B16 Committee Summary of Changes iv v vi vii Scope Transition Contours Welding Bevel Design Preparation of Inside Diameter of Welding End Tolerances Figures Maximum Envelope for Welding End Transitions Bevels for Wall Thickness Over mm (0.12 in.) to 22 mm (0.88 in.), Inclusive Weld Bevel Details for Wall Thickness Over 22 mm (0.88 in.) Weld Bevel Details for GTAW Root Pass [Wall Thickness Over mm (0.12 in.) to 10 mm (0.38 in.), Inclusive] Weld Bevel Details for GTAW Root Pass [Wall Thickness Over 10 mm (0.38 in.) to 25 mm (1.0 in.), Inclusive] Weld Bevel Details for GTAW Root Pass [Wall Thickness Over 25 mm (1.0 in.)] Table Dimensions of Welding Ends Mandatory Appendices I Inch Table II References 13 18 Nonmandatory Appendix A Quality System Program 19 iii 7 FOREWORD In July 1953, the American Welding Society presented a proposal on Welding End Preparation to Sectional Committee B16 of the American Standards Association (ASA), with the recommendation that it be considered as a candidate for an American Standard The proposal was expanded to include welding preparation for flanges and valves covered by ASA B16.5, Steel Pipe Flanges and Flanged Fittings, and for fittings covered by ASA B16.9, Buttwelding Fittings Consideration was also given to Pipe Fabrication Institute Standard ES-1 The third draft reviewed by Subcommittee 3, Subgroup (now Subcommittee F), of the B16 Sectional Committee was forwarded to the Committee, cosponsor organizations, and then ASA for approval Final approval was given on September 14, 1955, with the designation ASA B16.25-1955 Revisions were developed as a need for clarification and improvements became known and were approved as ASA B16.25-1958 and ASA B16.25-1964 After ASA reorganized as the American National Standards Institute (ANSI) and the Sectional Committee became American National Standards Committee B16, a further revision was approved as ANSI B16.25-1972 Subcommittee F immediately began work on a major expansion and updating of the Standard, adding illustrations and requirements for welding end configurations applicable to a number of specific circumstances, including cast steel and alloy valves When a draft had been developed that overcame the many problems and conflicting demands, the Standards Committee, cosecretariat organizations, and ANSI concurred in approval of ANSI B16.25-1979 on July 18, 1979 In 1982, American National Standards Committee B16 was reorganized as an ASME committee operating under procedures accredited by ANSI In the 1986 edition, inch dimensions were established as the standard, and numerous changes in text and format were made Notes for illustrations were also clarified Following approval by the Standards Committee and ASME, approval as an American National Standard was given by ANSI on October 8, 1986, with the new designation ASME/ANSI B16.25-1986 In 1992, the subcommittee revised the requirements for the preparation of the inside diameter of welding end The references in Annex B were also updated After public review and approval by ASME, this edition was approved by ANSI on October 26, 1992, with the new designation ASME B16.25-1992 In the 1997 edition, metric dimensions were added as an independent but equal standard to the inch units An Annex was also added to reference quality system requirements Following approval by the Standards Committee and ASME, this revision to the 1992 edition of B16.25 was approved as an American National Standard by ANSI on April 17, 1997, with the new designation ASME B16.25-1997 In the 2003 edition, the reference standard dates were updated There were clarifications to text made to address inquiries Tolerances on bevel angles were modified slightly Following approval by the Standards Committee and ASME, this revision to the 1997 edition of B16.25 was approved as an American National Standard by ANSI on December 17, 2003, with the new designation ASME B16.25-2003 In the 2007 edition, buttwelding end data were extended to cover requirements for sizes up to NPS 48 (DN 1200) The reference data were updated, and the interpretation section was removed from the Standard In this 2012 edition, the references in Mandatory Appendix II have been updated, and notes have been updated in the included tables This revision was approved by ANSI on October 22, 2012 Requests for interpretation or suggestions for revision should be sent to the Secretary, B16 Committee, The American Society of Mechanical Engineers, Three Park Avenue, New York, NY 10016-5990 iv ASME B16 COMMITTEE Standardization of Valves, Flanges, Fittings, and Gaskets (The following is the roster of the Committee at the time of approval of this Standard.) STANDARDS COMMITTEE OFFICERS W B Bedesem, Chair G A Jolly, Vice Chair C E O’Brien, Secretary STANDARDS COMMITTEE PERSONNEL G A Jolly, Vogt Valves/Flowserve Corp M Katcher, Haynes International W N McLean, B&L Engineering T A McMahon, Emerson Process Management M L Nayyar, Consultant C E O’Brien, The American Society of Mechanical Engineers W H Patrick, Dow Chemical Co R A Schmidt, Canadoil H R Sonderegger, Fluoroseal, Inc W M Stephan, Flexitallic LP F R Volgstadt, Volgstadt & Associates, Inc D A Williams, Southern Co Generation A Appleton, Alloy Stainless Products Co., Inc R W Barnes, ANRIC Enterprises, Inc W B Bedesem, Consultant R M Bojarczuk, ExxonMobil Research & Engineering Co D F Buccicone, Elkhart Products Corp A M Cheta, Shell Exploration and Production Co M A Clark, NIBCO, Inc G A Cuccio, Capitol Manufacturing Co C E Davila, Crane Energy D R Frikken, Becht Engineering Co., Inc R P Griffiths, U.S Coast Guard SUBCOMMITTEE F — STEEL-THREADED AND WELDING FITTINGS D R Frikken, Becht Engineering Co., Inc D Hunt, Jr., Fastenal G A Jolly, Vogt Valves/Flowserve Group D H Monroe, Consultant J P Tucker, Flowserve Corp G T Walden, Wolsley M M Zaidi, Jacobs Engineering Group, Inc G A Cuccio, Chair, Captiol Manufacturing Co A Appleton, Vice Chair, Alloy Stainless Products Co., Inc F Huang, Secretary, The American Society of Mechanical Engineers W J Birkholz, Ezeflow USA, Inc K W Doughty, Shaw Alloy Piping Products, Inc J P Ellenberger, Retired B G Fabian, Pennsylvania Machine Works v CORRESPONDENCE WITH THE B16 COMMITTEE General ASME Standards are developed and maintained with the intent to represent the consensus of concerned interests As such, users of this Standard may interact with the Committee by requesting interpretations, proposing revisions, and attending Committee meetings Correspondence should be addressed to: Secretary, B16 Standards Committee The American Society of Mechanical Engineers Three Park Avenue New York, NY 10016-5990 As an alternative, inquiries may be submitted via e-mail to: SecretaryB16@asme.org Proposing Revisions Revisions are made periodically to the Standard to incorporate changes that appear necessary or desirable, as demonstrated by the experience gained from the application of the Standard Approved revisions will be published periodically The Committee welcomes proposals for revisions to this Standard Such proposals should be as specific as possible, citing the paragraph number(s), the proposed wording, and a detailed description of the reasons for the proposal, including any pertinent documentation Proposing a Case Cases may be issued for the purpose of providing alternative rules when justified, to permit early implementation of an approved revision when the need is urgent, or to provide rules not covered by existing provisions Cases are effective immediately upon ASME approval and shall be posted on the ASME Committee Web page Requests for Cases shall provide a Statement of Need and Background Information The request should identify the Standard, the paragraph, figure or table number(s), and be written as a Question and Reply in the same format as existing Cases Requests for Cases should also indicate the applicable edition(s) of the Standard to which the proposed Case applies Interpretations Upon request, the B16 Committee will render an interpretation of any requirement of the Standard Interpretations can only be rendered in response to a written request sent to the Secretary of the B16 Standards Committee The request for interpretation should be clear and unambiguous It is further recommended that the inquirer submit his/her request in the following format: Subject: Edition: Question: Cite the applicable paragraph number(s) and the topic of the inquiry Cite the applicable edition of the Standard for which the interpretation is being requested Phrase the question as a request for an interpretation of a specific requirement suitable for general understanding and use, not as a request for an approval of a proprietary design or situation The inquirer may also include any plans or drawings that are necessary to explain the question; however, they should not contain proprietary names or information Requests that are not in this format will be rewritten in this format by the Committee prior to being answered, which may inadvertently change the intent of the original request ASME procedures provide for reconsideration of any interpretation when or if additional information that might affect an interpretation is available Further, persons aggrieved by an interpretation may appeal to the cognizant ASME Committee or Subcommittee ASME does not “approve,” “certify,” “rate,” or “endorse” any item, construction, proprietary device, or activity Attending Committee Meetings The B16 Standards Committee regularly holds meetings, which are open to the public Persons wishing to attend any meeting should contact the Secretary of the B16 Standards Committee vi ASME B16.25-2012 SUMMARY OF CHANGES Following approval by the ASME B16 Committee and ASME, and after public review, ASME B16.25-2012 was approved by the American National Standards Institute on October 22, 2012 ASME B16.25-2012 includes the following changes identified by a margin note, (12) Page Location Change Table Note (2) added 14 Table I-1 Note (2) added 18 Mandatory Appendix II Updated vii INTENTIONALLY LEFT BLANK viii ASME B16.25-2012 Fig Weld Bevel Details for GTAW Root Pass [Wall Thickness Over 25 mm (1.0 in.)] 10 deg ± 2.5 deg 10 deg ± 2.5 deg (0.12) to (0.06) 20 deg ± 2.5 deg 20 deg ± 2.5 deg Note (1) 19 to 25 (0.75 to 1.00) (0.19) R 19 to 25 (0.75 to 1.00) ± 0.4 (0.078 ± 0.016) A ± 0.4 (0.078 ± 0.016) A Note (1) 30 deg max 30 deg max (0.19) C ⫹0.25, ⫺1.02 (⫹0.010, ⫺0.040) (0.19) Type A C ⫹0.25, ⫺1.02 (⫹0.010, ⫺0.040) Type B GENERAL NOTES: (a) This detail applies for gas tungsten arc welding (GTAW) of the root pass where nominal wall thickness is greater than 25 mm (1.0 in.) (b) Broken lines denote maximum envelope for transitions from welding groove and land into body of component See Fig for details (c) See section for tolerances other than those given in these illustrations (d) Linear dimensions are in millimeters with inch values in parentheses NOTE: (1) Inside corners should be slightly rounded ASME B16.25-2012 Table Dimensions of Welding Ends (See Figs Through 6) (12) O.D at Welding Ends Nominal Pipe Size (NPS) Schedule No [Note (1)] Wrought or Fabricated Components, A [Notes (1), (2)] 21⁄2 30 40 80 160 XXS 73.0 73.0 73.0 73.0 73.0 75 75 75 75 75 63.50 62.50 59.00 54.00 45.00 63.60 62.93 59.69 55.28 47.43 4.78 5.16 7.01 9.53 14.02 30 40 80 160 XXS 88.9 88.9 88.9 88.9 88.9 91 91 91 91 91 79.50 78.00 73.50 66.50 58.50 79.50 78.25 74.53 68.38 61.19 4.78 5.49 7.62 11.13 15.24 31⁄2 30 40 80 101.6 101.6 101.6 105 105 105 92.00 90.00 85.50 92.20 90.52 86.42 4.78 5.74 8.08 30 40 80 120 160 XXS 114.3 114.3 114.3 114.3 114.3 114.3 117 117 117 117 117 117 104.50 102.00 97.00 92.00 87.50 80.00 104.90 102.73 98.28 93.78 89.65 83.30 4.78 6.02 8.56 11.13 13.49 17.12 40 80 120 160 XXS 141.3 141.3 141.3 141.3 141.3 144 144 144 144 144 128.00 122.00 116.00 109.50 103.00 128.80 123.58 118.04 112.47 106.92 6.55 9.53 12.70 15.88 19.05 40 80 120 160 XXS 168.3 168.3 168.3 168.3 168.3 172 172 172 172 172 154.00 146.50 140.00 132.00 124.50 154.82 148.06 142.29 135.31 128.85 7.11 10.97 14.27 18.26 21.95 20 30 40 60 80 219.1 219.1 219.1 219.1 219.1 223 223 223 223 223 206.50 205.00 203.00 198.50 193.50 206.95 205.74 203.75 200.02 195.84 6.35 7.04 8.18 10.31 12.70 100 120 140 XXS 160 219.1 219.1 219.1 219.1 219.1 223 223 223 223 223 189.00 182.50 178.00 174.50 173.00 191.65 186.11 181.98 179.16 177.79 15.09 18.26 20.62 22.23 23.01 20 30 40 60 80 100 273.0 273.0 273.0 273.0 273.0 273.0 278 278 278 278 278 278 260.50 257.50 254.50 247.50 243.00 236.50 260.85 258.31 255.74 249.74 245.55 240.01 6.35 7.80 9.27 12.70 15.09 18.26 10 Cast Components, A [Note (2)] B C [Note (3)] t ASME B16.25-2012 Table Dimensions of Welding Ends (Cont’d) (See Figs Through 6) O.D at Welding Ends Nominal Pipe Size (NPS) Schedule No [Note (1)] 10 (Cont’d) 120 140 160 12 14 16 18 20 Wrought or Fabricated Components, A [Notes (1), (2)] Cast Components, A [Note (2)] B C [Note (3)] t 273.0 273.0 273.0 278 278 278 230.00 222.00 216.00 234.44 227.51 221.95 21.44 25.40 28.58 20 30 STD 40 XS 323.8 323.8 323.8 323.8 323.8 329 329 329 329 329 311.00 307.00 305.00 303.00 298.50 311.65 308.10 306.08 304.72 300.54 6.35 8.38 9.53 10.31 12.70 60 80 100 120 140 160 323.8 323.8 323.8 323.8 323.8 323.8 329 329 329 329 329 329 295.00 289.00 281.00 273.00 266.50 257.00 297.79 292.17 285.24 278.31 272.75 264.45 14.27 17.48 21.44 25.40 28.58 33.32 20 STD 40 XS 60 355.6 355.6 355.6 355.6 355.6 362 362 362 362 362 340.00 336.50 333.50 330.00 325.50 340.70 337.88 335.08 332.34 328.15 7.92 9.53 11.13 12.70 15.09 80 100 120 140 160 355.6 355.6 355.6 355.6 355.6 362 362 362 362 362 317.50 308.00 300.00 292.00 284.00 321.22 312.86 305.93 299.00 292.07 19.05 23.83 27.79 31.75 35.71 20 STD 40 60 406.4 406.4 406.4 406.4 413 413 413 413 390.50 387.50 381.00 373.00 391.50 388.68 383.14 376.21 7.92 9.53 12.70 16.66 80 100 120 140 160 406.4 406.4 406.4 406.4 406.4 413 413 413 413 413 363.50 354.00 344.50 333.50 325.50 367.84 359.53 351.18 341.43 334.50 21.44 26.19 30.96 36.53 40.49 20 30 STD XS 40 457.2 457.2 457.2 457.2 457.2 464 464 464 464 464 441.50 435.00 438.00 432.00 428.50 442.30 436.68 439.48 433.94 431.19 7.92 11.13 9.53 12.70 14.27 60 80 100 120 140 160 457.2 457.2 457.2 457.2 457.2 457.2 464 464 464 464 464 464 419.00 409.50 398.50 387.50 378.00 366.50 422.82 414.46 404.78 395.03 386.77 376.99 19.05 23.83 29.36 34.93 39.67 45.24 STD XS 40 508.0 508.0 508.0 516 516 516 489.00 482.50 478.00 490.28 484.74 480.55 9.53 12.70 15.09 10