1、AN AMERICAN NATIONAL STANDARD ASME B16.25-2017 (Revision of ASME B16.25-2012) Buttwelding EndsASME B16.25-2017 (Revision of ASME B16.25-2012) Buttwelding Ends AN AMERICAN NATIONAL STANDARD xDate of Issuance: December 29, 2017 The next edition of this Standard is scheduled for publication in 2022. AS
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11、American Society of Mechanical Engineers Two Park Avenue, New York, NY 10016-5990 Copyright 2017 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All rights reserved Printed in U.S.A.CONTENTS Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12、. . . . . . . . . . . . . . . . . . . . . . iv Committee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v Correspondence With the B16 Committee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13、. . . . . . . . . . . . . . . . . vi Summary of Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii List of Changes in Record Number Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14、. . . . . . . . . . . . . ix 1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 Transition Contours . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15、 . 1 3 Welding Bevel Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 4 Preparation of Inside Diameter of Welding End . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 5 Tolerances . . . . . . . . . . . . . . . . . .
16、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Mandatory Appendices I Inch Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 II References . . . . . . . . . . . . . . . .
17、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Nonmandatory Appendix A Quality System Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Figures 1 Maximum Envelope for Welding End Transi
18、tions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 Bevels for Wall Thickness Over 3 mm (0.12 in.) to 22 mm (0.88 in.), Inclusive . . . . . . . . . . . . . 5 3 Weld Bevel Details for Wall Thickness Over 22 mm (0.88 in.) . . . . . . . . . . . . . . . . . . . . . . . . . 6
19、4 Weld Bevel Details for GTAW Root Pass Wall Thickness Over 3 mm (0.12 in.) to 10 mm (0.38 in.), Inclusive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 Weld Bevel Details for GTAW Root Pass Wall Thickness Over 10 mm (0.
20、38 in.) to 25 mm (1.0 in.), Inclusive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 Weld Bevel Details for GTAW Root Pass Wall Thickness Over 25 mm (1.0 in.) . . . . . . . . . . . . 8 Tables 1 Dimensions of Welding Ends,
21、 Metric . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 I-1 Dimensions of Welding Ends, U.S. Customary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 iiiFOREWORD In July 1953, the American Welding Society presented a proposal
22、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 F
23、langes 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 6 (now Subcommittee F), of the B16 Sectional Committee was forwarded to the Committ
24、ee, 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 reorgan
25、ized 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 an
26、d 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
27、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 ma
28、de. 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 preparat
29、ion 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
30、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 AS
31、ME 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 appr
32、oved 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 f
33、rom the Standard. In the 2012 edition, the references in Mandatory Appendix II were updated, and notes were updated in the included tables. In this 2017 edition, provisions have been made to update verbiage and readings. Following the approval by the ASME B16 Standards Committee, approval as an Amer
34、ican National Standard was given by ANSI on September 7, 2017. ivASME 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 R. M. Bojarczuk, Chair C. E. Davila, Vic
35、e Chair C. R. Ramcharran, Secretary STANDARDS COMMITTEE PERSONNEL A. Appleton, Alloy Stainless Products Co., Inc. J. E. Barker, Dezurik Water Controls K. Barron, Ward Manufacturing D. C. Bayreuther, Metso Automation W. B. Bedesem, Consultant R. M. Bojarczuk, ExxonMobil Research however, they should not contain proprietary names or information. vi
