Large Metallic Valves for Gas Distribution

Manually Operated, NPS 2½ (DN 65) to NPS 12 (DN 300),

125 psig (8.6 bar) Maximum

AN A MERICAN NA TIONAL S T AND ARD

ASME B16.38-2012

(Revision of ASME B16.38-2007)

ASME B16.38-2012

(Revision of ASME B16.38-2007)

Large Metallic Valves for Gas Distribution

Manually Operated, NPS 21⁄2 (DN 65) to NPS 12 (DN 300),

125 psig (8.6 bar) Maximum

AN AMERICAN NA TIONAL S T AND ARD

Three Park Avenue • New York, NY • 10016 USA

Date of Issuance: September 21, 2012

The next edition of this Standard is scheduled for publication in 2017.

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The American Society of Mechanical Engineers Three Park Avenue, New York, NY 10016-5990

Copyright © 2012 by

THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS

All rights reserved Printed in U.S.A.

CONTENTS

Foreword iv

Committee Roster v

Correspondence With the B16 Committee vi

1. Scope 1

2. Construction 1

3. Qualification Requirements 3

4. Production Testing 4

Figure

1 Bend Test Assembly 5

Tables

1. Duration of Test 3

2. Bending Moment Values 4

3. Flow and Head Loss Coefficients 6

Mandatory Appendix

I References 7

Nonmandatory Appendix

A Quality System Program 8

iii

FOREWORD

The B16 Standards Committee was organized in the spring of 1920 and held its organizational meeting on November 21 of that year. The group operated as a Sectional Committee (later redesignated as a Standards Committee) under the authorization of the American Engineering Standards Committee [subsequently named American Standards Association, United States of America Standards Institute, and now American National Standards Institute (ANSI)]. Sponsors for the group were the American Society of Mechanical Engineers, Manufacturers Standardization Society of the Valve and Fittings Industry, and the Heating and Piping Contractors National Association (later the Mechanical Contractors Association of America). In 1982, the B16 Committee was reorganized as an ASME Committee operating under procedures accredited by ANSI. The American Gas Association determined that standardization of gas valves used in distribution systems was desirable and needed. The A.G.A. Task Committee on Standards for Valves and Shutoffs was formed and development work commenced in 1958. In 1968, it was determined that a more acceptable document would result if approval was gained from ANSI, and to facilitate such action, the A.G.A. Committee became Subcommittee 13 of the B16 activity. This B16 group was later renamed Subcommittee L, which is its current

designation.

The first standard developed by Subcommittee L was ANSI B16.33, which was published in 1973. As a follow-up, ANSI B16.38 was subsequently developed to cover larger sizes of gas valves and shutoffs and was first published in 1978.

ANSI/ASME B16.38-1985 offered more performance requirements than had been customary in many B16 standards. It was expected that this would permit both manufacturers and users greater latitude in producing and using products made to that standard.

Editorial changes were made throughout the text and tables to bring the format in line with the rest of the B16 series of standards and to clarify the intent of that standard. Revisions included changes to the qualification requirements and to requirements for construction and valve ends, updating of reference standards, and editorial changes to the text and tables. The cover, headings, and designation of the standard had also been revised to reflect reorganization of the B16 Committee as an ASME Committee.

The 2007 edition of ASME B16.38 updated the 1985 Edition. All requirements were metricated, and the references were updated to the current revision. The paragraph on minimum levels of performance was expanded to describe valve types and their relevant standards. The section on “Lubrication (Sealant)” was renamed “Injection Sealant,” and the paragraph was edited for clarity. Paragraphs 2.6 (“Pressure-Containing Materials”), 2.7 (“Gas Resistance”), and 2.8 (“Temperature Resistance”) were added. The section covering elastomer components was new. Paragraph 3.2 (“Number of Tests”) was expanded to require that any material or design change that could affect qualification test results is reason to repeat all qualification tests. Wording throughout this edition was expanded for clarity.

The 2012 edition of B16.38 updated the referenced standards in Mandatory Appendix I.

All requests for interpretations or suggestions for revisions should be sent to the Secretary, B16 Committee, The American Society of Mechanical Engineers, Three Park Avenue, New York, NY 10016-5990.

Following approval by B16 Subcommittee L, the B16 Standards Committee, and ASME, ANSI approved this American National Standard on August 21, 2012.

iv

ASME B16 COMMITTEE

Standardization of Valves,

Flanges, Fittings, and Gaskets

(The following is the roster of the Committee at the time of approval of this Standard.)

STANDARDS COMMITTEE OFFICERS

W. B. Bedesem, Chair

G. A. Jolly, Vice Chair

C. E. O’Brien, Secretary

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

R. W. Barnes, Anric Enterprises, Inc.

W. B. Bedesem, Consultant

STANDARDS COMMITTEE PERSONNEL

G. A. Jolly, Vogt Valves/Flowserve Corp.

M. Katcher, Haynes International

W. N. McLean, B&L Engineering

R. M. Bojarczuk, ExxonMobil Research & Engineering Co.

D. F. Buccicone, Consultant

A. M. Cheta, Shell Exploration and Production Co.

M. A. Clark, Nibco, Inc.

G. A. Cuccio, Capitol Manufacturing Co.

1. E. Davila, Crane Energy

2. R. Frikken, Becht Engineering Co.

R. P. Griffiths, U.S. Coast Guard

T. A. McMahon, Emerson Process Management

M. L. Nayyar, Bechtel Power Corp.

C. E. O’Brien, The American Society of Mechanical Engineers

W. H. Patrick, The Dow Chemical Co.

R. A. Schmidt, Canadoil

H. R. Sonderegger, Fluoroseal, Inc.

W. M. Stephan, Flexitallic LP

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

D. A. Williams, Southern Co. Generation

SUBCOMMITTEE L — GAS SHUTOFFS AND VALVES

F. R. Volgstadt, Chair, Volgstadt and Associates, Inc.

T. Perera, Vice Chair, CSA International

F. Huang, Secretary, The American Society of Mechanical Engineers

R. W. Conley, Kerotest Manufacturing Corp.

P. V. Craig, Jomar Group

K. Duex, A. Y. McDonald Manufacturing Co.

R. B. Hai, R.B.H. Associates

D. Hunt, Jr., Fastenal

J. K. Maupin, Integrys

A. M. Pietramale, Consultant

v

CORRESPONDENCE WITH THE B16 COMMITTEE

General. ASME Standards are developed and maintained with the intent to represent the consensus of concerned interests. As such, users of this Standard may interact with the Committee by requesting interpretations, proposing revisions, and attending Committee meetings. Corre- spondence 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.

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

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the B16 Standards Committee.

vi

ASME B16.38-2012

LARGE METALLIC VALVES FOR GAS DISTRIBUTION

MANUALLY OPERATED, NPS 21⁄2 (DN 65) TO NPS 12 (DN 300),

125 psig (8.6 bar) MAXIMUM

1. SCOPE

   1. Valve Types

      This Standard covers requirements for manually oper- ated metallic valves in nominal sizes 21⁄2 (DN 65) through 12 (DN 300) having the inlet and outlet on a common centerline. These valves are intended for controlling the flow of gas from open to fully closed positions, for use in distribution and service lines where the maximum gage pressure does not exceed 125 psig (8.6 bar). Valve seats, seals, and stem packing may be nonmetallic.

      
      

   2. Application

      This Standard sets forth the minimum capabilities, characteristics, and properties that a newly manufac- tured metallic valve must possess in order to be consid- ered suitable for use in piping systems indicated above, carrying natural gas, manufactured gas [includes syn- thetic natural gas (SNG)], and liquefied petroleum gases (distributed as a vapor, with or without the admixture of air) or mixtures thereof.

      
      

   3. Referenced Standards

      Standards and specifications adopted by reference in this Standard and the names and addresses of the spon- soring organizations are shown in Mandatory Appendix I. It is not considered practical to refer to a specific edition of each of the standards and specifica- tions in the individual references. Instead, the specific edition references are included in Mandatory Appendix

      I. A product made in conformance with a prior edition of referenced standards will be considered to be in con- formance, even though the edition reference may be changed in a subsequent revision of the standard.

      
      

   4. Quality Systems

      Nonmandatory requirements relating to the product manufacturer’s quality system program are described in Nonmandatory Appendix A.

      
      

   5. Convention

      For determining conformance with this Standard, the convention for fixing significant digits where limits (maximum or 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.

   6. Codes and Regulations

      A valve used under the jurisdiction of a Federal Regulation, such as CFR Title 49, Part 192; the ASME Code for Pressure Piping, such as ASME B31.8; or the National Fuel Gas Code, Z223.1, is subject to any limita- tion of that code or regulation.

   7. Definitions

      NPS: nominal pipe size. NVS: nominal valve size. one bar: 100 kPa.

      PTFE: materials that comply with ASTM D4894, Specification for Polytetrafluoroethylene (PTFE) Granular Molding and Extrusion Materials.

      
      

      All pressures, unless otherwise stated, are gage pressures.

      
      

2. CONSTRUCTION

   1. Conformance

      1. Each completed and assembled valve at the time of manufacture and marked with the designation “B16.38” shall be capable of meeting the requirements set forth in this Standard.

      2. Classes 125 and 150 valves (depending upon their design) shall meet the requirements of one of the following standards: MSS SP-67, MSS SP-70, MSS SP-72, MSS SP-78, MSS SP-80, MSS SP-84, ASME B16.34, and ASME B16.42 (see Mandatory Appendix I).

   2. Tamperproof Features

Where valves are specified to be tamperproof, they shall be designed and constructed to minimize the possi- ble removal of the core of the valve with other-than- specialized tools, e.g., tools other than common wrenches, pliers, etc.

1