Pipe Flanges and Flanged Fittings

NPS 1/2 Through NPS 24 Metric/Inch Standard

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

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

PIPE FLANGES AND FLANGED FITTINGS

NPS 1⁄2 Through NPS 24 Metric/Inch Standard

ASME B16.5-2003

(Revision of ASME B16.5-1996)

Date of Issuance: October 29, 2004

The next edition of this Standard is scheduled for publication in 2007. There will be no addenda or written interpretations to the requirements of this Standard issued to this edition.

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Copyright © 2004 by

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CONTENTS

Foreword vi

Committee Roster ix

Correspondence With the B16 Committee x

2-1.10 Pressure–Temperature Ratings for Group 1.10 Materials 30

2-1.11 Pressure–Temperature Ratings for Group 1.11 Materials 31

2-1.13 Pressure–Temperature Ratings for Group 1.13 Materials 32

2-1.14 Pressure–Temperature Ratings for Group 1.14 Materials 33

2-1.15 Pressure–Temperature Ratings for Group 1.15 Materials 34

2-1.17 Pressure–Temperature Ratings for Group 1.17 Materials 35

2-2.1 Pressure–Temperature Ratings for Group 2.1 Materials 36

2-2.2 Pressure–Temperature Ratings for Group 2.2 Materials 37

2-2.3 Pressure–Temperature Ratings for Group 2.3 Materials 38

2-2.4 Pressure–Temperature Ratings for Group 2.4 Materials 39

2-2.5 Pressure–Temperature Ratings for Group 2.5 Materials 40

2-2.6 Pressure–Temperature Ratings for Group 2.6 Materials 41

2-2.7 Pressure–Temperature Ratings for Group 2.7 Materials 42

2-2.8 Pressure–Temperature Ratings for Group 2.8 Materials 43

2-2.9 Pressure–Temperature Ratings for Group 2.9 Materials 44

2-2.10 Pressure–Temperature Ratings for Group 2.10 Materials 45

2-2.11 Pressure–Temperature Ratings for Group 2.11 Materials 46

2-2.12 Pressure–Temperature Ratings for Group 2.12 Materials 47

2-3.1 Pressure–Temperature Ratings for Group 3.1 Materials 48

2-3.2 Pressure–Temperature Ratings for Group 3.2 Materials 48

2-3.3 Pressure–Temperature Ratings for Group 3.3 Materials 49

2-3.4 Pressure–Temperature Ratings for Group 3.4 Materials 50

2-3.5 Pressure–Temperature Ratings for Group 3.5 Materials 51

2-3.6 Pressure–Temperature Ratings for Group 3.6 Materials 52

2-3.7 Pressure–Temperature Ratings for Group 3.7 Materials 53

2-3.8 Pressure–Temperature Ratings for Group 3.8 Materials 54

2-3.9 Pressure–Temperature Ratings for Group 3.9 Materials 55

2-3.10 Pressure–Temperature Ratings for Group 3.10 Materials 56

2-3.11 Pressure–Temperature Ratings for Group 3.11 Materials 56

2-3.12 Pressure–Temperature Ratings for Group 3.12 Materials 57

2-3.13 Pressure–Temperature Ratings for Group 3.13 Materials 57

2-3.14 Pressure–Temperature Ratings for Group 3.14 Materials 58

2-3.15 Pressure–Temperature Ratings for Group 3.15 Materials 59

2-3.16 Pressure–Temperature Ratings for Group 3.16 Materials 60

2-3.17 Pressure–Temperature Ratings for Group 3.17 Materials 61

1. Permissible Imperfections in Flange Facing Finish for Raised Face and

   Large Male and Female Flanges 61

2. Dimensions of Facings (Other Than Ring Joints, All Pressure Rating

   Classes) 62

3. Dimensions of Ring-Joint Facings (All Pressure Rating Classes) 64

4. Reducing Threaded and Slip-On Flanges for Classes 150 Through 2500 68

5. Templates for Drilling Class 150 Flanges 69

6. Dimensions of Class 150 Flanges 70

7. Dimensions of Class 150 Flanged Fittings 73

8. Templates for Drilling Class 300 Flanges 78

9. Dimensions of Class 300 Flanges 79

10. Dimensions of Class 300 Flanged Fittings 82

11. Templates for Drilling Class 400 Flanges 86

12. Dimensions of Class 400 Flanges 87

13. Templates for Drilling Class 600 Flanges 89

14. Dimensions of Class 600 Flanges 90

15. Templates for Drilling Class 900 Flanges 92

16. Dimensions of Class 900 Flanges 93

17. Templates for Drilling Class 1500 Flanges 95

18. Dimensions of Class 1500 Flanges 96

19. Templates for Drilling Class 2500 Flanges 98

20. Dimensions of Class 2500 Flanges 99

    Annexes

    1. Threading of Pipe for American National Standard Thread Flanges 101

    2. Method Used for Establishing Pressure-Temperature Ratings 103

    3. Limiting Dimensions of Gaskets Other Than Ring Joint Gaskets 107

    4. Method for Calculating Bolt Lengths 109

    5. Quality System Program 111

    6. Pressure–Temperature Ratings and Dimensional Data for Classes 150, 300, 400, 600, 900, 1500, and 2500 Flanges and Classes 150 and 300

       Flanged Fittings in U.S. Customary Units 112

    7. Dimensions of Classes 400, 600, 900, 1500, and 2500 Flanged Fittings in

       U.S. Customary Units 195

    8. References 214

FOREWORD

In 1920, the American Engineering Standards Committee[later the American Standards Associa- tions (ASA)] organized Sectional Committee B16 to unify and further develop standards for pipe flanges and fittings (and later for valves and gaskets). Co-sponsors of the B16 Committee were the American Society of Mechanical Engineers (ASME), the Heating and Piping Contractors National Association [now Mechanical Contractors Association of America (MCAA)], and the Manufacturers Standardization Society of the Valves and Fittings Industry (MSS). Co-sponsors were later designated as co-secretariat organizations.

The Committee soon recognized the need for standardization of steel pipe flanges. In May, 1923, Subcommittee 3 was organized to develop such standards for pressures in the 250 psi to 3200 psi range and for elevated temperatures. Active work began in October, including steel flanged fittings. The first proposed standard was submitted to the Committee in April 1926 and approved by letter ballot in December. After favorable review by the three sponsor organizations, the Standard was approved as American Tentative Standard B16e in June 1927.

Experience in using the Standard showed the need for hub dimensions of companion flanges and for other changes, including rerating of 250 lb and 1350 lb flanges and development of flanged fittings with integral bases. An investigation was made into the factors determining stiffness of flanges and flange hubs. The revised edition was approved as ASA B16E-1932.

A revision was initiated in 1936, stimulated by suggestions from Committee members and industrial users. The resulting 1939 edition contained standards for welding neck flanges (com- pleted in March 1937), 1500 lb flanges in the 14 in. through 24 in. range 2500 lb flanges and flanged fittings in the 1⁄2 in. through 12-in. range, and dimensions for a full line of ring joint flanges developed by the American Petroleum Institute. Pressure-temperature ratings for alloy steel flanges and fittings, developed by Subcommittee 4, were included for the first time.

In August 1942, the War Production Board requested a review of measures to conserve vital materials in piping components. A special War Committee of B16 was appointed and, operating under War Standard Procedure, developed revised pressure-temperature ratings for all materials and all pressure classes. The ratings were published as American War Standard B16e5-1943. In 1945, under normal procedures, Subcommittees 3 and 4 reviewed the 1939 standard and the 1943 ratings, and recommended adoption of the wartime ratings. Their report was approved as Supplement No. 1 to B16e-1939 and published as ASA B16e6-1949. In addition to ratings, the supplement updated material specification references and added a table of metal wall thickness for welding-end valves.

Subcommittee 3 then began a revision of the entire standard. Technically, the 1949 Supplement was absorbed, new materials were recognized, a general rating method was developed and added as an appendix, and welding end preparations were expanded. Editorially, a new style of presentation was worked out, including tables rearranged for easier use. Approval by Sectional Committee, cosponsors, and ASA resulted in publication of ASA B16.5-1953 (designation changed from B16e).

Work soon began on further revisions. Class B ratings were deleted and Class A ratings were clarified as the standard. An appendix defined qualifications for gaskets, other than ring joint, which would merit the ratings. Another appendix defined the method for calculating bolt lengths (including measurement of the length of stud bolts between thread ends instead of between points). Pressure-temperature ratings for several new materials were added, the table of welding end dimensions was expanded, and the temperatures used in determining ratings were redefined. The resulting new edition, after approval, was published as ASA B16.5-1957.

The more modest revision approved as ASA B16.5-1961 changed the text to clarify the intent or to make requirements easier to administer. The next revision began in 1963 with nearly 100 comments and suggestions. No fundamental changes were made, but the text was further clarified and wall thicknesses less then 1⁄4 in. for flanged fittings were recognized in the 1968 edition.

A new joint study of ratings between Subcommittees 3 and 4 was initiated before the next revision. Based on Subcommittee 4 report, the rating procedure was revised and a rating basis for Class 150 (150 lb) flanges was developed. New product forms, bar and plate, were added for special applications, including fabricated flanged valves and fittings. Reference to welding-end valves was not included because a separate standard for them was. Bolt length calculations based on worst case tolerances led to a revision of tabulated lengths. Testing of valve subsequently published by SC 15 closure members was added to the test requirements. Following final approval on October 23, the Standard was published as ANSI B16.5-1973.

Subcommittee N (formerly 15) was assigned responsibility for all valve standards in late 1973. Subcommittee C (formerly 3) continues to have responsibility for flange standards. A revision was accordingly initiated to remove all references to valves. At the same time, comments from users and changes in the ASME Boiler and Pressure Vessel Code led to significant revisions in the Class 150 rating basis, and, in the ratings of stainless steel and certain alloy steel flanges and flanged fittings in all rating classes. Extensive public review comments led to addition of considerations for flanged joints, for bolting and gaskets, and of marking requirements. To avoid frequent and confusing changes in ratings as further changes in Code allowable stresses are made, it was agreed with Subcommittee N to leave ratings alone unless the relevant Code stress values are changed by more than 10%. After final approval by Standards Committee, co-sponsors and ANSI, ANSI B16.5-1977, Steel Pipe Flanges and Flanged Fittings, was published on June 16, 1977.

In 1979, work began on another new edition. Materials coverage was expanded by the addition of nickel and nickel alloys. Bolting rules were revised to cover nickel alloy bolts. Bolt hole and bolting were changed to provide interchangeability between inch and metric dimensions. Metric dimensional tables were made informational rather than alternative requirements of the Standard. Final approval was granted for ANSI B16.5-1984, Pipe Flanges and Flanged Fittings on August 14. In 1982, American National Standards Committee B16 was reorganized as an ASME Committee operating under procedures accredited by ANSI. The 1988 edition of the Standard extended nickel alloy ratings to higher temperatures, clarifying flat face flange requirements, and included other minor revisions. The Committee determined that any metric standard for flanges will stand alone, with metric bolting and gaskets; hence metric equivalents have been deleted. Following approval by the Standard Committee and ASME, approval as American National Standard was

given by ANSI on April 7, 1988, with the new designation ASME/ANSI B16.5-1988.

The 1996 Edition allowed flanges marked with more than one material grade or specification, revised flange facing finish requirements, revised pressure-temperature ratings for several material groups, added a nonmandatory quality system annex, and included several other revisions. The 1996 Edition was approved by ANSI on October 3, 1996, with the new designation of ASME B16.5-1996.

The 2003 Edition includes metric units as the primary reference units while maintaining U.S. Customary units in either parenthetical or separate forms. The goal is to delete the U.S. customary units when the standard is next issued. New materials have been added while some materials have been shifted from one group to another and new material groups have been established.

All pressure-temperature ratings have been recalculated using data from the latest edition of the ASME Boiler and Pressure Vessel Code, Section II, Part D. Annex F has been added to cover pressure-temperature ratings and dimensional data for Class 150 through 2500 flanges and Class 150 and 300 flanged fittings in U.S. Customary units. Table and figure numbers in Annex F are prefixed by the letter F and correspond to table and figure numbers in the main text for metric version with the exception of some table and figure numbers that have not been used in Annex

F. Of note, the flange thickness designations for Class 150 and 300 have been revised with reference to their raised faces. For these classes, the flange thickness dimensional reference planes have been altered, however, required flange thickness remains unchanged. The minimum flange thickness designation has been changed from C to tf and it does not include 2.0 mm (0.06 in.) raised face for Class 150 and 300 raised face flanges and flanged fittings. Because of diminished interest, flanged end fittings conforming to ASME Class 400 and higher are listed only with U.S. Customary units in Annex G. In addition, straight hub welding flanges have been incorporated as a new set of flanges in Classes 150 through 2500. Also, there are numerous requirement clarifications and editorial revisions.

Following the approval of the Standards Committee and ASME, approval for the new edition was granted by the American National Standards Institute on July 9, 2003.

Requests for Interpretations or suggestion for revision should be sent to the secretary, B16 Committee, Three Park Avenue, New York, NY 10016-5990.

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.)

OFFICERS

H. R. Sonderegger, Chair

M. L. Nayyar, Vice Chair

P. A. Reddington, Secretary

COMMITTEE PERSONNEL

W. B. Bedesem, ExxonMobil Research & Engineering Co.

M. Clark, Nibco, Inc.

A. Cohen, Arthur Cohen & Associates

1. E. Floren, Mueller Co.

2. R. Frikken, Becht Engineering

A. Hamilton, American Bureau of Shipping

M. L Henderson, Forgital USA

G. A. Jolly, Vogt Valves/Flowserve

M. Katcher, Haynes International

W. G. Knecht, Consultant

R. Koester, The William Powell Co.

R. D. Manning, U.S. Coast Guard

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

P. A. Reddington, The American Society of Mechanical Engineers

R. A. Schmidt, Trinity-Ladish

H. R. Sonderegger, Anvil International, Inc.

W. M. Stephan, Flexitallic LP

T. F. Stroud, Ductile Iron Pipe Research Association

R. E. White, Richard E. White & Associates PC

D. A. Williams, Southern Co. Services

SUBCOMMITTEE C — STEEL FLANGES AND FLANGED FITTINGS

M. L. Nayyar, Chair, Bechtel Power Corp.

J. Shih, The American Society of Mechanical Engineers

1. B. Bedesem, ExxonMobil Research & Engineering Co.

2. C. Bhasin, Sigmatech

R. Chakravarti, Foster Wheeler USA Corp.

C. E. Davila, Crane Valves

B. Dennis, Kerkau Manufacturing

J. P. Ellenberger, WFI International

D. R. Frikken, Becht Engineering

M. L. Henderson, Forgital USA

M. Katcher, Haynes International

R. Koester, The William Powell Co.

R. D. Manning, United States Coast Guard

W. N. McLean, Newco Valves

T. V. Ramakrishnan, Forged Vessel Connections

R. A. Schmidt, Trinity-Ladish

J. C. Thompson, Consultant

J. P Tucker, FlowServe

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

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 recom- mended that the inquirer submit his/her request in the following format:

Subject: Cite the applicable paragraph number(s) and the topic of the inquiry.

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. 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.

Requests that are not in this format will be rewritten in this format