Factory-Made Wrought Buttwelding Fittings

AN A MERICAN NA TIONAL S T AND ARD

ASME B16.9-2018

(Revision of ASME B16.9-2012)

ASME B16.9-2018

(Revision of ASME B16.9-2012)

Factory-Made

Wrought Buttwelding Fittings

AN AMERICAN NATIONAL STANDARD

Date of Issuance: October 29, 2018

The next edition of this Standard is scheduled for publication in 2023.

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CONTENTS

Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

Committee Roster vi

Correspondence With the B16 Committee vii

Summary of Changes ix

List of Changes in Record Number Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . x

1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2 Pressure Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

3 Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

4 Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

5 Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

6 Fitting Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

7 Surface Contours . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

8 End Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

9 Design Proof Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

10 Production Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

11 Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Mandatory Appendix

I References 28

Nonmandatory Appendix

6.1-11 Dimensions of Reducers 21

8-1 Welding Bevels and Root Face 23

9.2.1-1 Testing Coverage 25

9.3.1-1 Test Factor, f, Determination 25

11-1 Tolerances 26

FOREWORD

In 1921, the American Engineering Standards Committee, later the American Standards Association (ASA), organized Sectional Committee B16 to unify and further develop national standards 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 Mechanical Contractors Association of America (MCAA)], and the Manufacturers Standardization Society of the Valve and Fittings Industry (MSS). Cosponsors were later designated as cosecretariat organizations.

Standardization of welding fittings was initiated in 1937 by a subgroup (designated Subgroup 6) of Subcommittee 3. After consideration of several drafts, a standard was approved by the Committee, cosponsors, and ASA, and published with the designation ASA B16.9-1940.

Revisions were made in 1950 and 1955 to add sizes up to NPS 24 and to complete coverage of fittings in some sizes. These revisions were approved and published as ASA B16.9-1951 and ASA B16.9-1958. With the subgroup now desig- nated Subcommittee 6 (later Subcommittee F), further revisions were begun to clarify the intent of the Standard, to add angularity tolerances, and to include fittings of different types (long radius reducing elbows and crosses) and smaller sizes (NPS 1∕4 and NPS 1∕2). This revision was published as ASA B16.9-1964 after ASA approval.

After reorganization of ASA, first as the United States of America Standards Institute (USASI), then as the American National Standards Institute (ANSI), with the Sectional Committee being redesignated as an American National Standards Committee, another revision increasing the size range to NPS 48 and revising the text for clarity was approved and published as ANSI B16.9-1971.

In 1975, Subcommittee F began a major revision to bring the standard up to date with current practice and usage. Common fractions were expressed as decimals (but without intending higher precision) and metric dimensional equiva- lents were added. Provisions for step-wise change of radius for NPS 3∕4 long radius elbows and 180-deg returns were introduced. Following Standards Committee, cosecretariat, and ANSI approval, the revision was published as ANSI B16.9- 1978. It was updated by a corrective addendum, B16.9a-1981, issued in February 1982.

In 1982, American National Standards Committee B16 was reorganized as an ASME Committee operating under procedures accredited by ANSI. In ASME/ANSI B16.9-1986, the text was revised and inch dimensions were established as the standard.

In 1991, the Subcommittee reviewed the Standard and made a number of revisions that were included in ASME B16.9- 1993. Dimensions for short pattern lap joints were also added.

In ASME B16.9-2001, short radius elbows and returns were added, which included all dimensions and tolerances of ASME B16.28-1994. Metric units were provided as an independent but parallel alternative standard to U.S. Customary units. U.S. Customary units were moved into parentheses or separate tables in Mandatory Appendix I. In addition, a Quality System Program appendix was added.

In 2003, the Subcommittee reviewed the Standard and made a number of revisions. The scope of the Standard was changed to permit fabricated lap joint stub ends employing circumferential or intersection welds.

In 2006, the Subcommittee reviewed the Standard and made a number of additions and revisions. Segmental elbow requirements were added, as were 3D radius elbow dimensions. Reference documents were updated.

In 2012, the Subcommittee reviewed the Standard and made numerous revisions to the design proof test in section 9 and updated the references in Mandatory Appendix II.

This edition adds more specific descriptions of acceptable design methods, revises the requirements for the design proof test, and updates the references. In addition, the U.S. Customary tables in Mandatory Appendix I have been merged with the Metric tables and all tables have been redesignated. Following the approval of the ASME B16 Standards Committee, ANSI approved ASME B16.9-2018 as an American National Standard on September 25, 2018.

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

R. M. Bojarczuk, Chair

C. E. Davila, Vice Chair

C. Ramcharran, Secretary

STANDARDS COMMITTEE PERSONNEL

A. Appleton, Alloy Stainless Products Co., Inc.

1. E. Barker, Dezurik Water Controls

2. Barron, Ward Manufacturing

D. C. Bayreuther, Metso Automation, Flow Control Division

W. B. Bedesem, Consultant

R. M. Bojarczuk, Consultant

A. M. Cheta, Qatar Shell GTL

M. A. Clark, Consultant

G. A. Cuccio, Capitol Manufacturing Co.

J. D’Avanzo, Fluoroseal Valves

C. E. Davila, Crane Energy

K. S. Felder, Valero Energy

D. R. Frikken, Becht Engineering Co.

D. Hunt, Jr., Fastenal

G. A. Jolly, Samshin Ltd.

E. J. Lain, Exelon Nuclear

T. A. McMahon, Emerson Process Management

R. C. Merrick, Fluor Enterprises

M. L. Nayyar, NICE

W. H. Patrick, The Dow Chemical Co.

D. Rahoi, CCM 2000

1. Ramcharran, The American Society of Mechanical Engineers

2. F. Reid, VSP Technologies

R. A. Schmidt, Canadoil

J. P. Tucker, Flowserve Corp.

F. R. Volgstadt, Volgstadt & Associates, Inc.

F. Feng, Delegate, China Productivity Center for Machinery

R. W. Barnes, Contributing Member, Anric Enterprises, Inc.

P. V. Craig, Contributing Member, Jomar Group

B. G. Fabian, Contributing Member, Pennsylvania Machine Works

M. Katcher, Contributing Member, Haynes International

1. G. Kireta, Jr., Contributing Member, Copper Development Association, Inc.

   
   

   SUBCOMMITTEE F — STEEL THREADED AND WELDING FITTINGS

2. G. Fabian, Chair, Pennsylvania Machine Works

R. A. Schmidt, Vice Chair, Canadoil

E. Lawson, Secretary, The American Society of Mechanical Engineers

J. Oh, Secretary, The American Society of Mechanical Engineers

A. Appleton, Alloy Stainless Products Co., Inc.

G. A. Cuccio, Capitol Manufacturing Co.

1. G. Dominguez, Welding Outlets, Inc.

2. W. Doughty, CB&I Alloy Piping Products

J. P. Ellenberger

D. R. Frikken, Becht Engineering Co.

P. W. Heald, Bonney Forge

D. Hunt, Jr., Fastenal

G. A. Jolly, Samshin Ltd.

F. Kavarana, CBI, Inc.

W. Pritzl, Erne Fittings GmbH

J. P. Tucker, Flowserve Corp.

G. T. Walden, Wolseley

M. M. Zaidi, Jacobs Engineering Group, Inc.

1. J. Lafferty, Alternate, US Drop Forge Co.

   
   

   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 or a case, and attending Committee meetings. Correspondence should be addressed to:

   
   

   Secretary, B16 Standards Committee

   The American Society of Mechanical Engineers Two Park Avenue

   New York, NY 10016-5990

   https://go.asme.org/Inquiry

   
   

   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 to provide 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 and 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 Standards 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.

   Requests for interpretation should preferably be submitted through the online Interpretation Submittal Form. The form is accessible at https://go.asme.org/InterpretationRequest. Upon submittal of the form, the Inquirer will receive an automatic e-mail confirming receipt.

   If the Inquirer is unable to use the online form, he/she may e-mail the request to the Secretary of the B16 Standards Committee at SecretaryB16@asme.org, or mail it to the above address. The request for an interpretation should be clear and unambiguous. It is further recommended that the Inquirer submit his/her request in the following format:

   Subject: Cite the applicable paragraph number(s) and the topic of the inquiry in one or two words. Edition: Cite the applicable edition of the Standard for which the interpretation is being requested.

   Question: 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. Please provide a condensed and precise question, composed in such a way that a “yes” or “no” reply is acceptable.

   Proposed Reply(ies): Provide a proposed reply(ies) in the form of “Yes” or “No,” with explanation as needed. If entering replies to more than one question, please number the questions and replies.

   Background Information: Provide the Committee with any background information that will assist the Committee in understanding the inquiry. 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 the format described above may be rewritten in the appropriate format by the Committee prior to being answered, which may inadvertently change the intent of the original request.

   Moreover, ASME does not act as a consultant for specific engineering problems or for the general application or understanding of the Standard requirements. If, based on the inquiry information submitted, it is the opinion of the Committee that the Inquirer should seek assistance, the inquiry will be returned with the recommendation that such assistance be obtained.

   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 and/or telephone confer- ences that are open to the public. Persons wishing to attend any meeting and/or telephone conference should contact the Secretary of the B16 Standards Committee.

   
   

   ASME B16.9-2018 SUMMARY OF CHANGES

   
   

   Following approval by the ASME B16.9 Committee and ASME, and after public review, ASME B16.9-2018 was approved by the American National Standards Institute on September 29, 2018.

   
   

   In ASME B16.9-2018, the U.S. Customary tables formerly in Mandatory Appendix I have been merged with the Metric tables in the main text; the tables have been redesignated, Mandatory Appendix I deleted, and the cross-references updated accordingly. In addition, this edition includes the following changes identified by a margin note, (18). The Record Number listed below is explained in more detail in the “List of Changes in Record Number Order” following this Summary of Changes.

   
   

   Page 1	Location 1.4	Change (Record Number) First paragraph editorially revised
   1	1.5.1	References to Mandatory Appendix II
   		editorially revised
   2	2.2	Revised in its entirety (17-1543)
   3	Section 5	Revised (17-1543)
   3	6.2.4	In subpara. (c), “3D” revised to “3D radius”
   		(17-1543)
   3	Section 9	Revised in its entirety (17-1543)
   6	Table 5-1	Added (17-1543)
   8	Table 6.1-2	Formerly Tables 2 and I-2; illustration

   within table revised (17-1543)

   1. Table 6.1-5 Formerly Tables 5 and I-5; General Note editorially redesignated as Note (1), and Note reference added to the illustration

   2. Table 6.1-6 Formerly Tables 6 and I-6; in title, “3D” revised to “3D Radius,” and in 45-deg elbow entry for NPS 30,“964” mm revised to “946” mm (17-1543)

1. Table 8-1 Formerly Table 12; Note (2) revised (17- 1543)

2. Figure 8-1 Editorially redesignated from Figure 1

28 Mandatory Appendix I Redesignated from Mandatory Appendix II and updated (17-1543)

LIST OF CHANGES IN RECORD NUMBER ORDER

Record Number Changes

17-1543 Revised Table 6 title from “3D” to “3D Radius” in the Contents. Revised the Foreword. Revised section 2.2 in its entirety. Revised section 5. Revised “3D” to “3D radius” in section 6.2.4. Revised section 9 in its entirety. Replaced the figure in Tables 2 and I-2. Revised “3D” to “3D Radius” and “964” to “946” in Table 6. Revised the wording of Note

(2) in Table 12. Revised “3D” to “3D Radius” in Table I-6. Made multiple revisions in Mandatory Appendix II.

ASME B16.9-2018

FACTORY-MADE WROUGHT BUTTWELDING FITTINGS

1. SCOPE

   1. General

      This Standard covers overall dimensions, tolerances, ratings, testing, and markings for factory-made wrought buttwelding fittings in sizes NPS 1∕2 through NPS 48 (DN 15 through DN 1200).

      
      

   2. Special Fittings

      Fittings may be made to special dimensions, sizes, shapes, and tolerances by agreement between the man- ufacturer and the purchaser.

      
      

   3. Fabricated Fittings

Fabricated laterals and other fittings employing circum- ferential or intersection welds are considered pipe fabri- cation and are not within the scope of this Standard.

Fabricated lap joint stub ends are exempt from the above restrictions, provided they meet all the require- ments of the applicable ASTM material specification listed in section 5.

1.5.2 Codes and Regulations. A fitting used under the jurisdiction of the ASME Boiler and Pressure Vessel Code (BPVC), the ASME Code for Pressure Piping, or a govern- mental regulation is subject to any limitation of that code or regulation. This includes any maximum temperature limitation or rule governing the use of a material at low temperature.

1. Service Conditions

   Criteria for selection of fitting types and materials suitable for particular fluid service are not within the scope of this Standard.

   
   

2. Welding

   Installation welding requirements are outside the scope of this Standard.

   
   

3. Quality Systems

   Nonmandatory requirements relating to the fitting manufacturer’s Quality System Program are described in Nonmandatory Appendix A.

   
   

   ð18Þ

   
   

   1.4

   
   

   Relevant Units

4. Convention

ð18Þ

This Standard states values in both SI (Metric) and U.S. Customary units. These systems of units are to be regarded separately as standard. Within the text and tables, the U.S. Customary units are shown in parentheses. The values stated in each system are not exact equivalents; therefore, it is required that each system of units be used independently of the other. Combining values from the two systems constitutes nonconformance with the Standard.

The designation for size is NPS for both Metric- and Customary-dimensioned fittings. Fitting pressure rating is associated with the connecting wall thickness of pipe of equivalent size and material.

1.5 References

1.5.1 Referenced Standards. Standards and specifica- tions adopted by reference in this Standard are shown in Mandatory Appendix I. It is not considered practical to identify the specific edition of each standard and specifi- cation in the individual references. Instead, the specific edition reference is identified in Mandatory Appendix

I. A product made in conformance with a prior edition of referenced standards and in all other respects conforming to this Standard will be considered to be in conformance.

For determining conformance with this Standard, the convention for fixing significant digits where limits (maximum and minimum values) are specified shall be as defined in ASTM E29. This requires that an observed or calculated value be rounded off to the nearest unit in the last right-hand digit used for expressing the limit. Decimal values and tolerances do not imply a particular method of measurement.

1.10 Pressure Rating Designation

Class followed by a dimensionless number is the des- ignation for pressure–temperature ratings. Standardized designations for flanges per ASME B16.5 referenced in this Standard are Classes 150, 300, 600, 900, 1500, and 2500.

2 PRESSURE RATINGS

2.1 Basis of Ratings

The allowable pressure ratings for fittings designed in accordance with this Standard may be calculated as for straight seamless pipe of equivalent material (as shown by comparison of composition and mechanical properties in the respective material specifications) in accordance with the rules established in the applicable sections of ASME B31, Code for Pressure Piping. For the calculation, applicable data for the pipe size, wall