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ASME B16.25-2007
(Revision of ASME B16.25-2003)

Buttwelding Ends

A N A M E R I C A N N AT I O N A L STA N DA R D

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ASME B16.25-2007
(Revision of ASME B16.25-2003)

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
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Date of Issuance: March 7, 2008

The next edition of this Standard is scheduled for publication in 2012. There will be no addenda issued to this edition. ASME issues written replies to inquiries concerning interpretations of technical aspects of this Standard. Interpretations are published on the ASME Web site under the Committee Pages at http://cstools.asme.org as they are issued.

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 ? 2008 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All rights reserved Printed in U.S.A.

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CONTENTS
Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Committee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Correspondence With the B16 Committee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 3 4 5 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Transition Contours . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Welding Bevel Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Preparation of Inside Diameter of Welding End. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv v vi 1 1 1 2 3 4 5 6 7 7 8 9 13 18 19

Figures 1 Maximum Envelope for Welding End Transitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Bevels for Wall Thickness Over 3 mm (0.12 in.) to 22 mm (0.88 in.), Inclusive . . . . . . . . 3 Weld Bevel Details for Wall Thickness Over 22 mm (0.88 in.) . . . . . . . . . . . . . . . . . . . . . . . . 4 Weld Bevel Details for GTAW Root Pass [Wall Thickness Over 3 mm (0.12 in.) to 10 mm (0.38 in.), Inclusive] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Weld Bevel Details for GTAW Root Pass [Wall Thickness Over 10 mm (0.38 in.) to 25 mm (1.0 in.), Inclusive] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Weld Bevel Details for GTAW Root Pass [Wall Thickness Over 25 mm (1.0 in.)] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 1 Dimensions of Welding Ends . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mandatory Appendices I Inch Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Nonmandatory Appendix A Quality System Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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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 6 (now Subcommittee F) of the B16 Sectional Committee was forwarded to the Committee, to the cosponsor organizations, and then to 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 this 2007 edition, buttwelding end data has been extended to cover requirements for sizes up to NPS 48 (DN 1200). The reference data has been updated and the interpretation section has been removed from the standard. This revision was approved as an by American National Standards Institute on August 17, 2007. 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.
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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
H. R. Sonderegger, Chair M. L. Nayyar, Vice Chair U. D’Urso, Secretary

STANDARDS COMMITTEE PERSONNEL
R. W. Barnes, ANRIC Enterprises W. B. Bedesem, ExxonMobil Research and Engineering Co. D. F. Buccicone, Elkhart Products Corp. M. A. Clark, NIBCO, Inc. U. D’Urso, American Society of Mechanical Engineers C. E. Floren, Mueller Co. D. R. Frikken, Becht Engineering Co., Inc. A. Hamilton, ABS Americas M. L. Henderson, Consultant G. A. Jolly, Vogt Valves/Flowserve Corp.
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M. Katcher, Haynes International W. N. McLean, Newco Valves T. A. McMahon, Fisher Controls International, Inc. M. L. Nayyar, Bechtel Power Corp. J. D. Page, U.S. Nuclear Regulatory Commission W. H. Patrick, The Dow Chemical Co. R. A. Schmidt, Hackney Ladish, Inc. H. R. Sonderegger, Anvil International, Inc. W. M. Stephan, Flexitallic L.P. D. A. Williams, Southern Company Generation

SUBCOMMITTEE F — STEEL-THREADED AND WELDING FITTINGS
G. A. Jolly, Chair, Vogt Valves/Flowserve Corp. G. A. Cuccio, Vice Chair, Capitol Manufacturing Co. T. Lazar, Secretary, The American Society of Mechanical Engineers A. Appleton, Alloy Stainless Products Co., Inc. W. J. Birkholz, Markovitz Enterprises, Inc. K. W. Doughty, Shaw Alloy Piping Products, Inc. J. P. Ellenberger, Consultant D. R. Frikken, Becht Engineering Co., Inc. R. E. Johnson, Consultant C. J. Lafferty, Pennsylvania Machine Works, Inc. D. H. Monroe, Consultant R. A. Schmidt, Hackney Ladish, Inc. H. R. Sonderegger, Anvil International, Inc. J. P. Tucker, Flowserve Corp. M. M. Zaidi, Jacobs Engineering Group, Inc.

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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. 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, which are necessary to explain the question; however, they should not contain proprietary names or information.

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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.

ASME B16.25-2007

BUTTWELDING ENDS
1 SCOPE 1.1 General
This Standard covers the preparation of buttwelding ends of piping components to be joined into a piping system by welding. It includes requirements for welding bevels, for external and internal shaping of heavy-wall components, and for preparation of internal ends (including dimensions and tolerances). Coverage includes preparation for joints with the following: (a) no backing rings (b) split or noncontinuous backing rings (c) solid or continuous backing rings (d) consumable insert rings (e) gas tungsten arc welding (GTAW) of the root pass Details of preparation for any backing ring must be specified when ordering the component.
For NPS ≥ 4, the related DN p 25 NPS.

1.5 Referenced Standards Standards and specifications adopted by reference in this Standard are shown in Mandatory Appendix II, which is part of this Standard. It is not considered practical to identify the specific edition of each standard and specification in the individual references; instead, the specific edition is identified in Mandatory Appendix II. An end preparation made in conformance to this Standard in all other respects will be considered to be in conformance to the standard even though the edition reference may be changed in a revision of this Standard. 1.6 Quality Systems Nonmandatory requirements relating to the manufacturer ’s quality system program are described in Nonmandatory Appendix A. 1.7 Convention For the purpose of determining conformance with this Standard, the convention for fixing significant digits where limits, maximum or minimum values, are specified shall be “rounding off” as defined in ASTM Practice E 29. This requires that an observed or calculated value shall be rounded off to the nearest unit in the last righthand digit used for expressing the limit. Decimal values and tolerances do not imply a particular method of measurement.

1.2 Application This Standard applies to any metallic materials for which a welding procedure can be satisfactorily qualified, but does not prescribe specific welding processes or procedures. Unless otherwise specified by the purchaser, it does not apply to welding ends conforming to ASME B16.5, B16.9, or B16.47. 1.3 Standard Units The values stated in either metric or inch units are to be regarded separately as the standard. Within the text, the inch units are shown in parentheses. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with this Standard. 1.4 Size Nominal pipe size (NPS), followed by a dimensionless number, is the designation for nominal fitting size. NPS is related to the reference nominal diameter (DN) used in international standards. The relationship is typically as follows:
NPS
?2 ?4 1 11?4 11?2 2 21?2 3 4
3 1

2

TRANSITION CONTOURS

15 20 25 32 40 50 65 80 100

3 WELDING BEVEL DESIGN 3.1 Bevels for Other Than GTAW Root Pass
(a) Components having nominal wall thicknesses of 3 mm (0.12 in.) and less shall have ends cut square or slightly chamfered.
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DN

Figure 1 delineates the maximum envelope in which transitions from welding bevel to the outer surface of the component and from the root face to the inner surface of the component must lie. Except as specified in Note (5) to Fig. 1, and as otherwise specified by the purchaser, the exact contour within this envelope is the manufacturer’s option, provided it maintains the specified minimum wall thickness, has no slopes steeper than those indicated for the respective regions, and includes the proper surface for backing rings if specified.

ASME B16.25-2007

(b) Components having nominal wall thicknesses over 3 mm (0.12 in.) to 22 mm (0.88 in.) inclusive shall have single angle bevels as illustrated in Fig. 2. (c) Components having nominal wall thicknesses greater than 22 mm (0.88 in.) shall have compound angle bevels as illustrated in Fig. 3.

a cylindrical surface at the end as shown in Figs. 4 through 6.

4.2 Dimension C
Values for dimension C shown in Fig. 2, illustrations (c) and (d); Fig. 3, illustrations (c) and (d); and Figs. 5 and 6 can be determined by the following equations: (SI Units)
C p A ? O.D. tolerance ? 2 tmin ? 0.25 (1)

3.2 Bevels for GTAW Root Pass
(a) Components having nominal wall thicknesses of 3 mm (0.12 in.) and less shall have ends cut square or slightly chamfered. (b) Components having nominal wall thicknesses over 3 mm (0.12 in.) to 10 mm (0.38 in.) inclusive shall have 371?2-deg ± 21?2-deg bevels or slightly concave bevels. See Fig. 4. (c) Components having nominal wall thicknesses over 10 mm (0.38 in.) to 25 mm (1.0 in.) inclusive shall have bevels as shown in Fig. 5. (d) Components having nominal wall thicknesses greater than 25 mm (1.0 in.) shall have bevels as shown in Fig. 6.

(U.S. Customary Units)
C p A ? O.D. tolerance ? 2 tmin ? 0.010 (2)

where A p specified outside pipe diameter at welding end (see para. 3.3) O.D. tolerance p undertolerance on the pipe O.D. from the applicable piping specification tmin p t ? manufacturing tolerance for pipe wall thickness per applicable pipe specification, mm (in.) t p nominal wall thickness of pipe, mm (in.) 0.25 (0.010) p plus machining tolerance on Bore C, mm (in.) Based on tolerances specific to ASTM A 106 and ASTM A 335 pipe, including an undertolerance on wall thickness of 12.5%, eqs. (1) and (2) can be defined as follows: (SI Units)
C p A ? 0.79 ? 2 0.875t ? 0.25
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3.3 Outside Diameter at Welding Ends
Dimension A shall be either that specified in the applicable component standard or that specified in the purchaser ’s component specification. In the absence of a requirement for dimension A in a component standard or a purchaser ’s specification, the values for dimension A in Table 1 or Table I-1 may be used.

4

PREPARATION OF INSIDE DIAMETER OF WELDING END

4.1 General
Preparation of the inside diameter at the end of a component shall be in accordance with one of the following, as specified by the purchaser: (a) Components to be welded without backing rings shall meet the requirements of the standard or specification for the component. (b) Components to be welded using split or noncontinuous backing rings shall be contoured with a cylindrical surface at the end as shown in Fig. 2, illustration (b) and Fig. 3, illustration (b). If the backing ring contour is other than rectangular, details must be furnished by the purchaser. (c) Components to be welded using solid or continuous backing rings shall be contoured with a cylindrical or tapered surface at the end as specified by the purchaser. End preparation is illustrated in Fig. 2, illustration (c) and Fig. 3, illustration (c) for rectangular ends and in Fig. 2, illustration (d) and Fig. 3, illustration (d) for tapered ends. (d) Components to be welded using consumable insert rings or GTAW root pass shall be contoured with
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(U.S. Customary Units)
C p A ? 0.031 ? 2 0.875t ? 0.010

Tables 1 and I-1 list the C values for pipe with an undertolerance of 12.5% on wall thickness, including ASTM A 106 and ASTM A 335 pipe, in sizes NPS 2? through NPS 48. For pipe with a pipe wall thickness undertolerance other than 12.5%, do not use the C data from Tables 1 and I-1. See para. 4.3(a).

4.3 Exceptions
(a) For pipe or tubing varying from the ASTM A 106 and A 335 types, having different wall thickness and/or outside diameter tolerances (such as forged and bored pipe), the foregoing equations may be inapplicable. Equations (1) and (2) may be used to determine C for these applications. The purchaser shall specify the C dimension when Tables 1 and I-1 data do not apply.

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ASME B16.25-2007

(b) For components in smaller sizes and lower schedule numbers, it may be necessary to deposit weld metal on the inside diameter (I.D.) or use thicker wall materials in order to machine the backing ring while maintaining required wall thickness. This condition may also arise when using material whose nominal dimensions indicate sufficient metal but whose actual I.D., considering tolerances, is large enough to require additional metal.

the measured diameters may vary with orientation. A tolerance of +0.25 mm (+0.010 in.) applies to the average C diameter in Figs. 2 and 3, illustrations (c) and (d). A tolerance of +0.25 mm, ?1.02 mm (+0.010 in., ?0.040 in.) applies to the average C diameter for Figs. 5 and 6.

5.3 Dimension A
Unless otherwise specified, the tolerances for dimension A shall be as follows:
Size
NPS ≤ 5 NPS ≥ 6

5

TOLERANCES (See Figs. 2, 3, 5, and 6)

Tolerance
+2.5 mm, ?0.79 mm (+0.10 in., ?0.031 in.) +4.0 mm, ?0.79 mm (+0.16 in., ?0.031 in.)

5.1 Dimension B
Values for the I.D. at the welding end [see dimension B, Fig. 2, illustrations (a) and (b); and Fig. 3, illustrations (a) and (b)] shall be as specified in the applicable standard or specification for the component.

5.4 Wall Thickness
The maximum thickness, tmax, at the end of the component is (a) greater of tmin + 4 mm (0.16 in.) or 1.15tmin when ordered on a minimum wall basis (b) greater of tmin + 4 mm (0.16 in.) or 1.10tnom when ordered on a nominal wall basis (see Fig. 1) The minimum thickness, tmin, shall be as specified in the applicable standard or specification for the component (see Figs. 2, 3, 5, and 6).

5.2 Welding Bevels, Root Face, and Dimension C
Values of welding bevels, root face, and dimension C shall be as indicated in Figs. 2 through 6. Large diameter pipe and fittings with a relatively thin wall have a tendency to spring out-of-round after removal from the machining fixture. For this reason,

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ASME B16.25-2007

Fig. 1 Maximum Envelope for Welding End Transitions
tmin
2

Outside

1.5tmin Radius 0.05tmin

Note (5)
Outside

45 deg max.

Radius

0.05tmin

30 deg max.

Note (3)

Note (4)

Component or Fitting

tnom

tmin

Maximum [Note (2)] Minimum 1.0tmin
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30 deg max. Note (1)
Inside Note (5) Inside

Maximum slope 1:3 Radius 0.05tmin

2tmin transition region

NOTES: (1) The value of tmin is whichever of the following is applicable: (a) the minimum ordered wall thickness of the pipe to include pipe that is purchased to a nominal wall thickness with an undertolerance other than 12.5% (b) 0.875 times the nominal wall thickness of pipe ordered to a pipe schedule wall thickness that has an undertolerance of 12.5% (c) the minimum ordered wall thickness of the cylindrical welding end of a component or fitting (or the thinner of the two) when the joint is between two components (2) The maximum thickness at the end of the components is (a) the greater of tmin + 4 mm (0.16 in.) or 1.15tmin when ordered on a minimum wall basis (b) the greater of tmin + 4 mm (0.16 in.) or 1.10tnom when ordered on a nominal wall basis (3) Weld bevel shown is for illustration only. (4) The weld reinforcement permitted by applicable code may lie outside the maximum envelope. (5) Where transitions using maximum slope do not intersect inside or outside surface, as shown by phantom outlines, maximum slopes shown or alternate radii shall be used.

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ASME B16.25-2007

Fig. 2 Bevels for Wall Thickness Over 3 mm (0.12 in.) to 22 mm (0.88 in.), Inclusive
37.5 deg ± 2.5 deg
37.5 deg ± 2.5 deg
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Note (1)

1.6 ± 0.8 (0.06 ± 0.03)
A

Note (2)

1.6 ± 0.8 (0.06 ± 0.03)

30 deg max.
B

A

B

13 (0.5) min.

(a) Welding End Detail for Joint Without Backing Ring

(b) Welding End Detail for Joint Using Split Rectangular Backing Ring

37.5 deg ± 2.5 deg

37.5 deg ± 2.5 deg

Note (2)

Note (2)

1.6 ± 0.8 (0.06 ± 0.03) 30 deg max.
C +0.25, 0 (+0.010,

A

1.6 ± 0.8 (0.06 ± 0.03)

10 deg
C +0.25, 0 (+0.010,

A

13 (0.5) min.

0)

30 deg max.

6 (0.22) min.

0)

(c) Welding End Detail for Joint Using Continuous Rectangular Backing Ring

(d) Welding End Detail for Joint Using Continuous Tapered Backing Ring

GENERAL NOTES: (a) Broken lines denote maximum envelope for transitions from welding bevel and root face into body of component. See Fig. 1 for details. (b) See section 5 for tolerances other than those given in these illustrations. (c) Purchase order must specify contour of any backing ring to be used. (d) Linear dimensions are in millimeters with inch values in parentheses. NOTES: (1) Internal surface may be as-formed or machined for dimension B at root face. Contour within the envelope shall be in accordance with section 2. (2) Intersections should be slightly rounded.

5
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ASME B16.25-2007

Fig. 3 Weld Bevel Details for Wall Thickness Over 22 mm (0.88 in.)
10 deg ± 2.5 deg 10 deg ± 2.5 deg

Note (2)
19 ± 2 (0.75 ± 0.06) 37.5 deg ± 2.5 deg
37.5 deg ± 2.5 deg

1.6 ± 0.8 (0.06 ± 0.03) Note (1)
B
A
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19 ± 2 (0.75 ± 0.06) 30 deg max.

1.6 ± 0.8 (0.06 ± 0.03)
A

B

13 (0.5) min.

(a) Welding End Detail for Joint Without Backing Ring

(b) Welding End Detail for Joint Using Split Rectangular Backing Ring

10 deg ± 2.5 deg

10 deg ± 2.5 deg

Note (2)
19 ± 2 (0.75 ± 0.06)

37.5 deg ± 2.5 deg

Note (2) 19 ± 2 (0.75 ± 0.06)

37.5 deg ± 2.5 deg

1.6 ± 0.8 (0.06 ± 0.03)
A

1.6 ± 0.8 (0.06 ± 0.03)
A

30 deg max.
C

10 deg 0.25, 0 ( 0.010,

13 (0.5) min.

0.25, 0 ( 0.010,

C

0)

30 deg max.

6 (0.22) min.

0)

(c) Welding End Detail for Joint Using Continuous Rectangular Backing Ring

(d) Welding End Detail for Joint Using Continuous Tapered Backing Ring

GENERAL NOTES: (a) Broken lines denote maximum envelope for transitions from welding bevel and root face into body of component. See Fig. 1 for details. (b) See section 5 for tolerances other than those given in these illustrations. (c) Purchase order must specify contour of any backing ring to be used. (d) Linear dimensions are in millimeters with inch values in parentheses. NOTES: (1) Internal surface may be as-formed or machined for dimension B at root face. Contour within the envelope shall be in accordance with section 2. (2) Intersections should be slightly rounded.

6
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ASME B16.25-2007

Fig. 4 Weld Bevel Details for GTAW Root Pass [Wall Thickness Over 3 mm (0.12 in.) to 10 mm (0.38 in.), Inclusive]
37.5 deg ± 2.5 deg Alternate

1.6 ± 0.8 (0.06 ± 0.03)
GENERAL NOTES: (a) This detail applies for gas tungsten arc welding (GTAW) of the root pass where nominal wall thickness is over 3 mm (0.12 in.) to 10 mm (0.38 in.), inclusive. (b) Linear dimensions are in millimeters with inch values in parentheses.

Fig. 5 Weld Bevel Details for GTAW Root Pass [Wall Thickness Over 10 mm (0.38 in.) to 25 mm (1.0 in.), Inclusive]
--`,``,,,,,``,`,,`,,`,```,,,`-`-`,,`,,`,`,,`---

20 deg ± 2.5 deg

20 deg ± 2.5 deg

3 (0.12)

0 to 2 (0.06)

5 (0.19) R Note (1) 2 ± 0.4 (0.078 ± 0.016) A Note (1) 2 ± 0.4 A (0.078 ± 0.016)

30 deg max.
C 5 (0.19) min.
Type A

30 deg max. 0.25, 1.02 ( 0.010, 0.040)
C

5 (0.19) min.
Type B

0.25, 1.02 ( 0.010, 0.040)

GENERAL NOTES: (a) This detail applies for gas tungsten arc welding (GTAW) of the root pass where nominal wall thickness is over 10 mm (0.38 in.) to 25 mm (1.0 in.), inclusive. (b) Broken lines denote maximum envelope for transitions from welding groove and land into body of component. See Fig. 1 for details. (c) See section 5 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.

7
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ASME B16.25-2007

Fig. 6 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

3 (0.12) 20 deg ± 2.5 deg Note (1) 19 to 25 (0.75 to 1.00) 2 ± 0.4 (0.078 ± 0.016) A
19 to 25 (0.75 to 1.00) 20 deg ± 2.5 deg

0 to 2 (0.06)

5 (0.19) R 2 ± 0.4 (0.078 ± 0.016) A

Note (1)
30 deg max.

30 deg max.
C 5 (0.19) min. 0.25, 1.02 ( 0.010, 0.040)

5 (0.19) min.

C

0.25, 1.02 ( 0.010, 0.040)

Type A

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. 1 for details. (c) See section 5 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.

--`,``,,,,,``,`,,`,,`,```,,,`-`-`,,`,,`,`,,`---

8
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ASME B16.25-2007

Table 1 Dimensions of Welding Ends (See Figs. 1 Through 6)
O.D. at Welding Ends
Wrought or Fabricated Components, A [Note (1)]
73.0 73.0 73.0 73.0 73.0 88.9 88.9 88.9 88.9 88.9 101.6 101.6 101.6 114.3 114.3 114.3 114.3 114.3 114.3 141.3 141.3 141.3 141.3 141.3 168.3 168.3 168.3 168.3 168.3 219.1 219.1 219.1 219.1 219.1 219.1 219.1 219.1 219.1 219.1 273.0 273.0 273.0 273.0 273.0 273.0

Nominal Pipe Size (NPS)
21?2

Schedule No. [Note (1)]
30 40 80 160 XXS 30 40 80 160 XXS 30 40 80 30 40 80 120 160 XXS 40 80 120 160 XXS 40 80 120 160 XXS 20 30 40 60 80 100 120 140 XXS 160

Cast Components, A
75 75 75 75 75 91 91 91 91 91 105 105 105 117 117 117 117 117 117 144 144 144 144 144 172 172 172 172 172 223 223 223 223 223 223 223 223 223 223 278 278 278 278 278 278

B
63.50 62.50 59.00 54.00 45.00 79.50 78.00 73.50 66.50 58.50 92.00 90.00 85.50 104.50 102.00 97.00 92.00 87.50 80.00 128.00 122.00 116.00 109.50 103.00 154.00 146.50 140.00 132.00 124.50 206.50 205.00 203.00 198.50 193.50 189.00 182.50 178.00 174.50 173.00 260.50 257.50 254.50 247.50 243.00 236.50

C [Note (2)]
63.60 62.93 59.69 55.28 47.43 79.50 78.25 74.53 68.38 61.19 92.20 90.52 86.42 104.90 102.73 98.28 93.78 89.65 83.30 128.80 123.58 118.04 112.47 106.92 154.82 148.06 142.29 135.31 128.85 206.95 205.74 203.75 200.02 195.84 191.65 186.11 181.98 179.16 177.79 260.85 258.31 255.74 249.74 245.55 240.01

t
4.78 5.16 7.01 9.53 14.02 4.78 5.49 7.62 11.13 15.24 4.78 5.74 8.08 4.78 6.02 8.56 11.13 13.49 17.12 6.55 9.53 12.70 15.88 19.05 7.11 10.97 14.27 18.26 21.95 6.35 7.04 8.18 10.31 12.70 15.09 18.26 20.62 22.23 23.01 6.35 7.80 9.27 12.70 15.09 18.26

3

31?2

4

5

6

8

10

20 30 40 60 80 100

9
--`,``,,,,,``,`,,`,,`,```,,,`-`-`,,`,,`,`,,`---

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ASME B16.25-2007

Table 1 Dimensions of Welding Ends (Cont’d) (See Figs. 1 Through 6)
O.D. at Welding Ends
Wrought or Fabricated Components, A [Note (1)]
273.0 273.0 273.0 323.8 323.8 323.8 323.8 323.8 323.8 323.8 323.8 323.8 323.8 323.8 355.6 355.6 355.6 355.6 355.6 355.6 355.6 355.6 355.6 355.6 406.4 406.4 406.4 406.4 406.4 406.4 406.4 406.4 406.4 457.2 457.2 457.2 457.2 457.2 457.2 457.2 457.2 457.2 457.2 457.2 508.0 508.0 508.0

Nominal Pipe Size (NPS)
10 (Cont’d)

Schedule No. [Note (1)]
120 140 160 20 30 STD 40 XS 60 80 100 120 140 160

Cast Components, A
278 278 278 329 329 329 329 329 329 329 329 329 329 329 362 362 362 362 362 362 362 362 362 362 413 413 413 413 413 413 413 413 413 464 464 464 464 464 464 464 464 464 464 464 516 516 516

B
230.00 222.00 216.00 311.00 307.00 305.00 303.00 298.50 295.00 289.00 281.00 273.00 266.50 257.00 340.00 336.50 333.50 330.00 325.50 317.50 308.00 300.00 292.00 284.00 390.50 387.50 381.00 373.00 363.50 354.00 344.50 333.50 325.50 441.50 435.00 438.00 432.00 428.50 419.00 409.50 398.50 387.50 378.00 366.50 489.00 482.50 478.00

C [Note (2)]
234.44 227.51 221.95 311.65 308.10 306.08 304.72 300.54 297.79 292.17 285.24 278.31 272.75 264.45 340.70 337.88 335.08 332.34 328.15 321.22 312.86 305.93 299.00 292.07 391.50 388.68 383.14 376.21 367.84 359.53 351.18 341.43 334.50 442.30 436.68 439.48 433.94 431.19 422.82 414.46 404.78 395.03 386.77 376.99 490.28 484.74 480.55

t
21.44 25.40 28.58 6.35 8.38 9.53 10.31 12.70 14.27 17.48 21.44 25.40 28.58 33.32 7.92 9.53 11.13 12.70 15.09 19.05 23.83 27.79 31.75 35.71 7.92 9.53 12.70 16.66 21.44 26.19 30.96 36.53 40.49 7.92 11.13 9.53 12.70 14.27 19.05 23.83 29.36 34.93 39.67 45.24 9.53 12.70 15.09

12

14

20 STD 40 XS 60 80 100 120 140 160 20 STD 40 60 80 100 120 140 160 20 30 STD XS 40 60 80 100 120 140 160

16

18

20

STD XS 40

10
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--`,``,,,,,``,`,,`,,`,```,,,`-`-`,,`,,`,`,,`---

ASME B16.25-2007

Table 1 Dimensions of Welding Ends (Cont’d) (See Figs. 1 Through 6)
O.D. at Welding Ends
Wrought or Fabricated Components, A [Note (1)]
508.0 508.0 508.0 508.0 508.0 508.0 558.8 558.8 558.8 558.8 558.8 558.8 558.8 558.8 609.6 609.6 609.6 609.6 609.6 609.6 609.6 609.6 609.6 609.6 660.4 660.4 660.4 711.2 711.2 711.2 711.2 762.0 762.0 762.0 762.0 812.8 812.8 812.8 812.8 812.8 863.6 863.6 863.6 863.6 863.6

Nominal Pipe Size (NPS)
20 (Cont’d)

Schedule No. [Note (1)]
60 80 100 120 140 160 STD XS 60 80 100 120 140 160

Cast Components, A
516 516 516 516 516 516 567 567 567 567 567 567 567 567 619 619 619 619 619 619 619 619 619 619 670 670 670 721 721 721 721 772 772 772 772 825 825 825 825 825 876 876 876 876 876

B
467.00 455.50 443.00 432.00 419.00 408.00 539.00 533.00 514.00 501.00 488.50 476.00 463.00 450.50 590.50 584.00 581.00 574.50 560.50 547.50 532.00 517.50 505.00 490.50 645.50 641.34 635.00 695.50 692.14 686.00 679.50 746.00 742.94 736.50 730.00 797.00 793.74 787.50 781.00 778.00 848.00 844.54 838.00 832.00 828.50

C [Note (2)]
470.88 461.13 450.02 440.29 429.17 419.44 541.08 535.54 518.86 507.75 496.63 485.52 474.41 463.30 591.88 586.34 583.59 577.97 565.49 554.38 540.49 528.03 516.91 504.37 645.50 642.68 637.14 696.30 693.48 687.94 682.37 747.10 744.28 738.74 733.17 797.90 795.08 789.54 783.97 781.17 848.70 845.88 840.34 834.77 831.97

t
20.62 26.19 32.54 38.10 44.45 50.01 9.53 12.70 22.23 28.58 34.93 41.28 47.63 53.98 9.53 12.70 14.27 17.48 24.61 30.96 38.89 46.02 52.37 59.54 7.92 9.53 12.70 7.92 9.53 12.70 15.88 7.92 9.53 12.70 15.88 7.92 9.53 12.70 15.88 17.48 7.92 9.53 12.70 15.88 17.48
--`,``,,,,,``,`,,`,,`,```,,,`-`-`,,`,,`,`,,`---

22

24

STD XS 30 40 60 80 100 120 140 160

26

10 STD 20 10 STD 20 30 10 STD 20 30 10 STD 20 30 40 10 STD 20 30 40

28

30

32

34

11
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ASME B16.25-2007

Table 1 Dimensions of Welding Ends (Cont’d) (See Figs. 1 Through 6)
O.D. at Welding Ends
Wrought or Fabricated Components, A [Note (1)]
914.4 914.4 914.4 914.4 914.4 965.2 965.2 1016.0 1016.0 1066.8 1066.8 1117.6 1117.6 1168.4 1168.4 1219.2 1219.2

Nominal Pipe Size (NPS)
36

Schedule No. [Note (1)]
10 STD 20 30 40 STD XS STD XS STD XS STD XS STD XS STD XS

Cast Components, A
927 927 927 927 927 978 978 1029 1029 1079 1079 1130 1130 1181 1181 1232 1232

B
898.50 895.34 889.00 882.50 876.50 946.00 940.00 997.00 990.50 1047.50 1041.50 1098.50 1092.00 1149.50 1143.00 1200.00 1194.00

C [Note (2)]
899.50 896.68 891.14 885.57 880.02 947.48 941.94 998.28 992.74 1049.08 1043.54 1099.88 1094.34 1150.68 1145.14 1201.48 1195.94

t
7.92 9.53 12.70 15.88 19.05 9.53 12.70 9.53 12.70 9.53 12.70 9.53 12.70 9.53 12.70 9.53 12.70

38 40 42 44 46 48

GENERAL NOTES: (a) Dimensions are in millimeters. (b) See section 5 for tolerances. NOTES: (1) Data are from ASME B36.10M or a more precise rounding of the inch dimensions from Table I-1. Data in the table are also applicable to ASME B36.19M when the wall thickness conforms to ASME B36.10M. Letter designations signify (a) STD p standard wall thickness (b) XS p extra strong wall thickness (c) XXS p double, extra strong wall thickness (2) Internal machining for continuous backing rings for sizes NPS 2 and smaller is not contemplated. See para. 4.2 for C dimension for sizes not listed.
--`,``,,,,,``,`,,`,,`,```,,,`-`-`,,`,,`,`,,`---

12
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ASME B16.25-2007

MANDATORY APPENDIX I INCH TABLE
This Appendix provides a table (Table I-1) of the standard inch dimensions for fittings.

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ASME B16.25-2007

Table I-1 Dimensions of Welding Ends (See Figs. 1 Through 6)
O.D. at Welding Ends
Wrought or Fabricated Components, A [Note (1)]
2.875 2.875 2.875 2.875 2.875 3.500 3.500 3.500 3.500 3.500 4.000 4.000 4.000 4.500 4.500 4.500 4.500 4.500 4.500 5.563 5.563 5.563 5.563 5.563 6.625 6.625 6.625 6.625 6.625 8.625 8.625 8.625 8.625 8.625 8.625 8.625 8.625 8.625 8.625 10.750 10.750 10.750 10.750 10.750 10.750

Nominal Pipe Size (NPS)
21?2

Schedule No. [Note (1)]
30 40 80 160 XXS 30 40 80 160 XXS 30 40 80 30 40 80 120 160 XXS 40 80 120 160 XXS 40 80 120 160 XXS 20 30 40 60 80 100 120 140 XXS 160

Cast Components, A
2.96 2.96 2.96 2.96 2.96 3.59 3.59 3.59 3.59 3.59 4.12 4.12 4.12 4.62 4.62 4.62 4.62 4.62 4.62 5.69 5.69 5.69 5.69 5.69 6.78 6.78 6.78 6.78 6.78 8.78 8.78 8.78 8.78 8.78 8.78 8.78 8.78 8.78 8.78 10.94 10.94 10.94 10.94 10.94 10.94

B
2.499 2.469 2.323 2.125 1.771 3.124 3.068 2.900 2.624 2.300 3.624 3.548 3.364 4.124 4.026 3.826 3.624 3.438 3.152 5.047 4.813 4.563 4.313 4.063 6.065 5.761 5.501 5.187 4.897 8.125 8.071 7.981 7.813 7.625 7.437 7.187 7.001 6.875 6.813 10.250 10.136 10.020 9.750 9.562 9.312

C [Note (2)]
2.505 2.479 2.351 2.178 1.868 3.130 3.081 2.934 2.692 2.409 3.630 3.564 3.402 4.130 4.044 3.869 3.692 3.530 3.279 5.070 4.866 4.647 4.428 4.209 6.094 5.828 5.600 5.326 5.072 8.146 8.099 8.020 7.873 7.709 7.544 7.326 7.163 7.053 6.998 10.272 10.172 10.070 9.834 9.670 9.451

t
0.188 0.203 0.276 0.375 0.552 0.188 0.216 0.300 0.438 0.600 0.188 0.226 0.318 0.188 0.237 0.337 0.438 0.531 0.674 0.258 0.375 0.500 0.625 0.750 0.280 0.432 0.562 0.719 0.864 0.250 0.277 0.322 0.406 0.500 0.594 0.719 0.812 0.875 0.906 0.250 0.307 0.365 0.500 0.594 0.719

3

31?2

4

5

6

8

10

20 30 40 60 80 100

14
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--`,``,,,,,``,`,,`,,`,```,,,`-`-`,,`,,`,`,,`---

ASME B16.25-2007

Table I-1 Dimensions of Welding Ends (Cont’d) (See Figs. 1 Through 6)
O.D. at Welding Ends
Wrought or Fabricated Components, A [Note (1)]
10.750 10.750 10.750 12.750 12.750 12.750 12.750 12.750 12.750 12.750 12.750 12.750 12.750 12.750 14.000 14.000 14.000 14.000 14.000 14.000 14.000 14.000 14.000 14.000 16.000 16.000 16.000 16.000 16.000 16.000 16.000 16.000 16.000 18.000 18.000 18.000 18.000 18.000 18.000 18.000 18.000 18.000 18.000 18.000 20.000 20.000 20.000

Nominal Pipe Size (NPS)
10 (Cont’d)

Schedule No. [Note (1)]
120 140 160 20 30 STD 40 XS 60 80 100 120 140 160

Cast Components, A
10.94 10.94 10.94 12.97 12.97 12.97 12.97 12.97 12.97 12.97 12.97 12.97 12.97 12.97 14.25 14.25 14.25 14.25 14.25 14.25 14.25 14.25 14.25 14.25 16.25 16.25 16.25 16.25 16.25 16.25 16.25 16.25 16.25 18.28 18.28 18.28 18.28 18.28 18.28 18.28 18.28 18.28 18.28 18.28 20.31 20.31 20.31

B
9.062 8.750 8.500 12.250 12.090 12.000 11.938 11.750 11.626 11.374 11.062 10.750 10.500 10.126 13.376 13.250 13.124 13.000 12.812 12.500 12.124 11.812 11.500 11.188 15.376 15.250 15.000 14.688 14.312 13.938 13.562 13.124 12.812 17.376 17.124 17.250 17.000 16.876 16.500 16.124 15.688 15.250 14.876 14.438 19.250 19.000 18.812

C [Note (2)]
9.232 8.959 8.740 12.272 12.132 12.053 11.999 11.834 11.725 11.505 11.232 10.959 10.740 10.413 13.413 13.303 13.192 13.084 12.920 12.646 12.318 12.044 11.771 11.498 15.413 15.303 15.084 14.811 14.482 14.155 13.826 13.442 13.170 17.413 17.192 17.303 17.084 16.975 16.646 16.318 15.936 15.553 15.225 14.842 19.303 19.084 18.920

t
0.844 1.000 1.125 0.250 0.330 0.375 0.406 0.500 0.562 0.688 0.844 1.000 1.125 1.312 0.312 0.375 0.438 0.500 0.594 0.750 0.938 1.094 1.250 1.406 0.312 0.375 0.500 0.656 0.844 1.031 1.219 1.438 1.594 0.312 0.438 0.375 0.500 0.562 0.750 0.938 1.156 1.375 1.562 1.781 0.375 0.500 0.594

12

14

20 STD 40 XS 60 80 100 120 140 160

16

20 STD 40 60 80 100 120 140 160

18

20 30 STD XS 40 60 80 100 120 140 160

20

STD XS 40

--`,``,,,,,``,`,,`,,`,```,,,`-`-`,,`,,`,`,,`---

15
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ASME B16.25-2007

Table I-1 Dimensions of Welding Ends (Cont’d) (See Figs. 1 Through 6)
O.D. at Welding Ends
Wrought or Fabricated Components, A [Note (1)]
20.000 20.000 20.000 20.000 20.000 20.000 22.000 22.000 22.000 22.000 22.000 22.000 22.000 22.000 24.000 24.000 24.000 24.000 24.000 24.000 24.000 24.000 24.000 24.000 26.000 26.000 26.000 28.000 28.000 28.000 28.000 30.000 30.000 30.000 30.000 32.000 32.000 32.000 32.000 32.000 34.000 34.000 34.000 34.000 34.000

Nominal Pipe Size (NPS)
20 (Cont’d)

Schedule No. [Note (1)]
60 80 100 120 140 160 STD XS 60 80 100 120 140 160

Cast Components, A
20.31 20.31 20.31 20.31 20.31 20.31 22.34 22.34 22.34 22.34 22.34 22.34 22.34 22.34 24.38 24.38 24.38 24.38 24.38 24.38 24.38 24.38 24.38 24.38 26.38 26.38 26.38 28.38 28.38 28.38 28.38 30.38 30.38 30.38 30.38 32.50 32.50 32.50 32.50 32.50 34.50 34.50 34.50 34.50 34.50

B
18.376 17.938 17.438 17.000 16.500 16.062 21.250 21.000 20.250 19.750 19.250 18.750 18.250 17.750 23.250 23.000 22.876 22.624 22.062 21.562 20.938 20.376 19.876 19.312 25.376 25.250 25.000 27.376 27.250 27.000 26.750 29.376 29.250 29.000 28.750 31.376 31.250 31.000 30.750 30.624 33.376 33.250 33.000 32.750 32.624

C [Note (2)]
18.538 18.155 17.717 17.334 16.896 16.513 21.303 21.084 20.428 19.990 19.553 19.115 18.678 18.240 23.303 23.084 22.975 22.755 22.263 21.826 21.280 20.788 20.350 19.857 25.413 25.303 25.084 27.413 27.303 27.084 26.865 29.413 29.303 29.084 28.865 31.413 31.303 31.084 30.865 30.755 33.413 33.303 33.084 32.865 32.755

t
0.812 1.031 1.281 1.500 1.750 1.969 0.375 0.500 0.875 1.125 1.375 1.625 1.875 2.125 0.375 0.500 0.562 0.688 0.969 1.219 1.531 1.812 2.062 2.344 0.312 0.375 0.500 0.312 0.375 0.500 0.625 0.312 0.375 0.500 0.625 0.312 0.375 0.500 0.625 0.688 0.312 0.375 0.500 0.625 0.688

22

24

STD XS 30 40 60 80 100 120 140 160

26

10 STD 20 10 STD 20 30 10 STD 20 30 10 STD 20 30 40 10 STD 20 30 40

28

30

32

34

16
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ASME B16.25-2007

Table I-1 Dimensions of Welding Ends (Cont’d) (See Figs. 1 Through 6)
O.D. at Welding Ends
Wrought or Fabricated Components, A [Note (1)]
36.000 36.000 36.000 36.000 36.000 38.000 38.000 40.000 40.000 42.000 42.000 44.000 44.000 46.000 46.000 48.000 48.000

Nominal Pipe Size (NPS)
36

Schedule No. [Note (1)]
10 STD 20 30 40 STD XS STD XS STD XS STD XS STD XS STD XS

Cast Components, A
36.50 36.50 36.50 36.50 36.50 38.50 38.50 40.50 40.50 42.50 42.50 44.50 44.50 46.50 46.50 48.50 48.50

B
35.376 35.250 35.000 34.750 34.500 37.250 36.000 39.250 39.000 41.250 41.000 43.250 43.000 45.250 45.000 47.250 47.000

C [Note (2)]
35.413 35.303 35.084 34.865 34.646 37.303 37.084 39.303 39.084 41.303 41.084 43.303 43.084 45.303 45.084 47.303 47.084

t
0.312 0.375 0.500 0.625 0.750 0.375 0.500 0.375 0.500 0.375 0.500 0.375 0.500 0.375 0.500 0.375 0.500

38 40 42 44 46 48

GENERAL NOTES: (a) Dimensions are in inches. (b) See section 5 for tolerances. NOTES: (1) Data are from ASME B36.10M and are also applicable to ASME B36.19M data when the wall thickness conforms to ASME B36.10M. Letter designations signify (a) STD p standard wall thickness (b) XS p extra strong wall thickness (c) XXS p double, extra strong wall thickness (2) Internal machining for continuous backing rings for sizes NPS 2 and smaller is not contemplated. See para. 4.2 for C dimension for sizes not listed.

17
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ASME B16.25-2007

MANDATORY APPENDIX II REFERENCES

The following is a list of publications referenced in this Standard. ASME B16.5-2003, Pipe Flanges and Flanged Fittings ASME B16.9-2003, Factory-Made Wrought Buttwelding Fittings ASME B16.47-1996, Large Diameter Steel Flanges ASME B36.10M-2004, Welded and Seamless Wrought Steel Pipe ASME B36.19M-2004, Stainless Steel Pipe Publisher: The American Society of Mechanical Engineers (ASME), Three Park Avenue, New York, NY 10016-5990; Order Department: 22 Law Drive, Box 2300, Fairfield, NJ 07007-2300 ASTM A 106/A 106M-06a, Specification for Seamless Carbon Steel Pipe for High-Temperature Service

ASTM A 335/A 335M-06, Specification for Seamless Ferritic Alloy Steel Pipe for High-Temperature Service ASTM E 29-06b, Standard Practice for Using Significant Digits in Test Data to Determine Conformance With Specifications Publisher: American Society for Testing and Materials (ASTM), 100 Barr Harbor Drive, West Conshohocken, PA 19428 ISO 9000-2000: Quality management systems — Fundamentals and vocabulary ISO 9001-2000: Quality management systems — Requirements ISO 9004-2000: Quality management systems — Guidelines for performance improvement Publisher: International Organization for Standardization (ISO), 1 ch. de la Voie-Creuse, Case ` postale 56, CH-1211, Geneve 20, Switzerland/Suisse

18
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ASME B16.25-2007

NONMANDATORY APPENDIX A QUALITY SYSTEM PROGRAM

The products manufactured in accordance with this Standard shall be produced under a quality system program following the principles of an appropriate standard from the ISO 9000 series.1 A determination of the need for registration and/or certification of the product
The series is also available from the American National Standards Institute (ANSI) and the American Society for Quality Control (ASQC) as American National Standards that are identified by a prefix “Q” replacing the prefix “ISO.” Each standard of the series is listed in Mandatory Appendix II.
1

manufacturer’s quality system program by an independent organization shall be the responsibility of the manufacturer. The detailed documentation demonstrating program compliance shall be available to the purchaser at the manufacturer ’s facility. A written summary description of the program utilized by the product manufacturer shall be available to the purchaser upon request. The product manufacturer is defined as the entity whose name or trademark appears on the product in accordance with the marking or identification requirements of this Standard.

19
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AMERICAN NATIONAL STANDARDS FOR PIPING, PIPE FLANGES, FITTINGS, AND VALVES
Scheme for the Identification of Piping Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A13.1-1996 Pipe Threads, General Purpose (Inch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1.20.1-1983(R1992) Dryseal Pipe Threads (Inch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1.20.3-1976(R1998) Cast Iron Pipe Flanges and Flanged Fittings: Classes 25, 125, and 250 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.1-1998 Malleable Iron Threaded Fittings: Classes 150 and 300. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.3-1998 Gray Iron Threaded Fittings: Classes 125 and 250 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.4-1998 Pipe Flanges and Flanged Fittings (NPS 1?2 Through NPS 24) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.5-1996 Factory-Made Wrought Buttwelding Fittings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.9-2001 Face-to-Face and End-to-End Dimensions of Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.10-2000 Forged Fittings, Socket-Welding and Threaded . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.11-2001 Cast Iron Threaded Drainage Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.12-1998 Ferrous Pipe Plugs, Bushings, and Locknuts with Pipe Threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.14-1991 Cast Bronze Threaded Fittings: Classes 125 and 250. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.15-1985(R1994) Cast Copper Alloy Solder Joint Pressure Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.18-1984(R1994) Metallic Gaskets for Pipe Flanges: Ring-Joint, Spiral-Wound, and Jacketed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.20-1998 Nonmetallic Flat Gaskets for Pipe Flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.21-1992 Wrought Copper and Copper Alloy Solder Joint Pressure Fittings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.22-1995 Cast Copper Alloy Solder Joint Drainage Fittings — DWV. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.23-1992 Cast Copper Alloy Pipe Flanges and Flanged Fittings: Classes 150, 300, 600, 900, 1500, and 2500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.24-2006 Buttwelding Ends. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.25-2007 Cast Copper Alloy Fittings for Flared Copper Tubes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.26-1988 Wrought Steel Buttwelding Short Radius Elbows and Returns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.28-1994 Wrought Copper and Wrought Copper Alloy Solder Joint Drainage Fittings — DWV. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.29-1994 Manually Operated Metallic Gas Valves for Use in Gas Piping Systems up to 125 psig (Sizes 1?2 Through 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.33-1990 Valves — Flanged, Threaded, and Welding End. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.34-1996 Orifice Flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.36-1996 Large Metallic Valves for Gas Distribution (Manually Operated, NPS 21?2 to 12, 125 psig Maximum). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.38-1985(R1994) Malleable Iron Threaded Pipe Unions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.39-1998 Manually Operated Thermoplastic Gas Shutoffs and Valves in Gas Distribution Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.40-1985(R1994) Functional Qualification Requirements for Power Operated Active Valve Assemblies for Nuclear Power Plants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.41-1983(R1989) Ductile Iron Pipe Flanges and Flanged Fittings, Classes 150 and 300 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.42-1998 Manually Operated Metallic Gas Valves for Use in House Piping Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.44-1995 Cast Iron Fittings for Sovent? Drainage Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.45-1998 Large Diameter Steel Flanges (NPS 26 Through NPS 60) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.47-1996 Steel Line Blanks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.48-1997 Factory-Made, Wrought Steel, Buttwelding Induction Bends for Transportation and Distribution Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B16.49-2007 Power Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B31.1-1998 Fuel Gas Piping (not an ANSI standard). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B31.2-1968 Process Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B31.3-1999 Pipeline Transportation Systems for Liquid Hydrocarbons and Other Liquids. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B31.4-1998 Refrigeration Piping and Heat Exchanger Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B31.5-2000 Gas Transmission and Distribution Piping Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B31.8-1999 Building Services Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B31.9-1996 Slurry Transportation Piping Systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B31.11-1989(R1998) Manual for Determining the Remaining Strength of Corroded Pipelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B31G-1991 Welded and Seamless Wrought Steel Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B36.10M-1996 Stainless Steel Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B36.19M-1985(R1994) Self-Operated and Power-Operated Safety-Related Valves Functional Specification Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N278.1-1975(R1992) The ASME Publications Catalog shows a complete list of all the Standards published by the Society. For a complimentary catalog, or the latest information about our publications, call 1-800-THE-ASME (1-800-843-2763).

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ASME B16.25-2007

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