1、Large Metallic Valves for Gas DistributionManually Operated, NPS 21/2(DN 65) to NPS 12 (DN 300), 125 psig (8.6 bar) MaximumAN AMERICAN NATIONAL STANDARDASME B16.38-2007Revision of ANSI/ASME B16.38-1985 (R2005)Copyright ASME International Provided by IHS under license with ASME Not for ResaleNo repro
2、duction or networking permitted without license from IHS-,-,-ASME B16.38-2007Revision of ANSI/ASME B16.38-1985 (R2005)Large MetallicValves forGas DistributionManually Operated, NPS 212(DN 65) to NPS 12 (DN 300),125 psig (8.6 bar) MaximumAN AMERICAN NATIONAL STANDARDThree Park Avenue New York, NY 100
3、16Copyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-Date of Issuance: February 4, 2008The next edition of this Standard is scheduled for publication in 2012. There will be no addendaissued to this e
4、dition.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisStandard. Interpretations are published on the ASME Web site under the Committee Pages athttp:/cstools.asme.org as they are issued.ASME is the registered trademark of The American Society of Mechan
5、ical Engineers.This code or standard was developed under procedures accredited as meeting the criteria for American NationalStandards. The Standards Committee that approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an opportunity to p
6、articipate. The proposed code or standard was madeavailable 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 de
7、vice, or activity.ASME does not take any position with respect to the validity of any patent rights asserted in connection with anyitems mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability forinfringement of any applicable Letters Patent, nor as
8、sumes any such liability. Users of a code or standard are expresslyadvised that determination of the validity of any such patent rights, and the risk of infringement of such rights, isentirely their own responsibility.Participation by federal agency representative(s) or person(s) affiliated with ind
9、ustry is not to be interpreted asgovernment or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations issued in accordance with governing ASME procedures andpolicies which precludes the issuance of interpretations by individual volunteers.No part of
10、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 EngineersThree Park Avenue, New York, NY 10016-5990Copyright 2008 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll righ
11、ts reservedPrinted in U.S.A.Copyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-CONTENTSForeword ivCommittee Roster . vCorrespondence With the B16 Committee vi1 Scope . 12 Construction. 13 Qualificati
12、on Requirements . 34 Production Testing . 4Figure1 Bend Test Assembly 5Tables1 Duration of Test 32 Bending Moment Values 43 Flow and Head Loss Coefficients 6Mandatory AppendixI References 7Nonmandatory AppendixA Quality System Program 8iiiCopyright ASME International Provided by IHS under license wi
13、th ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-FOREWORDThe B16 Standards Committee was organized in the spring of 1920 and held its organizational meetingon November 21 of that year. The group operated as a Sectional Committee (later redesignated as a Stan
14、dardsCommittee) under the authorization of the American Engineering Standards Committee subsequently namedAmerican Standards Association, United States of America Standards Institute, and now American NationalStandards Institute (ANSI). Sponsors for the group were the American Society of Mechanical
15、Engineers,Manufacturers Standardization Society of the Valve and Fittings Industry, and the Heating and PipingContractors National Association (later the Mechanical Contractors Association of America). In 1982, theB16 Committee was reorganized as an ASME Committee operating under procedures accredit
16、ed by ANSI.The American Gas Association determined that standardization of gas valves used in distribution systemswas desirable and needed. The A.G.A. Task Committee on Standards for Valves and Shutoffs was formedand development work commenced in 1958. In 1968, it was determined that a more acceptab
17、le documentwould result if approval was gained from ANSI, and to facilitate such action, the A.G.A. Committee becameSubcommittee 13 of the B16 activity. This B16 group was later renamed Subcommittee L, which is its currentdesignation.The first standard developed by Subcommittee L was ANSI B16.33, wh
18、ich was published in 1973. As afollow-up, ANSI B16.38 was subsequently developed to cover larger sizes of gas valves and shutoffs andwas first published in 1978.ANSI/ASME B16.38-1985 offered more performance requirements than had been customary in many B16standards. It was expected that this would p
19、ermit both manufacturers and users greater latitude in producingand using products made to that standard.Editorial changes were made throughout the text and tables to bring the format in line with the rest ofthe B16 series of standards and to clarify the intent of that standard. Revisions included c
20、hanges to thequalification requirements and to requirements for construction and valve ends, updating of referencestandards, and editorial changes to the text and tables. The cover, headings, and designation of the standardhad also been revised to reflect reorganization of the B16 Committee as an AS
21、ME Committee.Following approval by the B16 Committee and its ASME Supervisory Board, this Standard was approvedas an American National Standard by ANSI on November 9, 1985.This edition of ASME B16.38 updates the 1985 edition. All requirements are metricated, and the referencesare updated to the curr
22、ent revision. The paragraph on minimum levels of performance has been expandedto describe valve types and their relevant standards. The section on “Lubrication (Sealant)” has been renamedInjection Sealant and the paragraph edited for clarity. Paragraphs 2.6 (“Pressure-Containing Materials”),2.7 (“Ga
23、s Resistance”), and 2.8 (“Temperature Resistance”) have been added. The section covering ElastomerComponents is new. Paragraph 3.2 (“Number of Tests”) has been expanded to require that any material ordesign change that could affect qualification test results is reason to repeat all qualification tes
24、ts. Wordingthroughout this edition has been expanded for clarity.All requests for interpretations or suggestions for revisions should be sent to the Administrative Secretary,B16 Committee, The American Society of Mechanical Engineers, Three Park Avenue, New York, NY10016-5990.Following approval by B
25、16 Subcommittee L, the Standards Committee, and ASME, ANSI approved thisAmerican National Standard on December 4, 2007.ivCopyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ASME B16 COMMITTEEStandardi
26、zation of Valves,Flanges, Fittings, and Gaskets(The following is the roster of the Committee at the time of approval of this Standard.)STANDARDS COMMITTEE OFFICERSH. R. Sonderegger, ChairM. L. Nayyar, Vice ChairU. DUrso, SecretarySTANDARDS COMMITTEE PERSONNELR. W. Barnes, ANRIC Enterprises, Inc.W. B
27、. Bedesem, ExxonMobil Research and Engineering Co.D. F. Buccicone, Elkhart Products Corp.M. A. Clark, NIBCO, Inc.U. DUrso, The American Society of Mechanical EngineersC. E. Floren, Mueller Co.D. R. Frikken, Becht Engineering Co.M. L. Henderson, TIEC, Inc.G. A. Jolly, Vogt Valves/Flowserve Corp.SUBCO
28、MMITTEE L GAS SHUTOFFS AND VALVESC. E. Floren, Chair, Mueller Co.F. R. Volgstadt, Vice Chair, Volgstadt and Associates, Inc.T. Lazar, Secretary, The American Society of Mechanical EngineersR. W. Conley, Kerotest Manufacturing Corp.P. V. Craig, Jomar International Ltd.K. Duex, A. Y. McDonald Manufact
29、uring Co.vM. Katcher, Haynes International, Inc.W. N. McLean, Newco ValvesT. A. McMahon, Fisher Controls International, Inc.M. L. Nayyar, Bechtel Corp.J. D. Page, U.S. Nuclear Regulatory CommissionW. H. Patrick, The Dow Chemical Co.R. A. Schmidt, Hackney Ladish, Inc.H. R. Sonderegger, Anvil Internat
30、ional, Inc.W. M. Stephan, Flexitallic, L.P.D. A. Williams, Southern Company GenerationD. S. Glover, BrassCraft Manufacturing Co.J. B. McGowan, Jr., UMAC, Inc.T. Perera, CSA InternationalA. M. Pietramale, Nicor GasC. Stutsman, NIBCO, Inc.D. P. Zapalac, R. W. Lyall however, theyshould not contain prop
31、rietary names or information.Requests that are not in this format will be rewritten in this format by the Committee priorto being answered, which may inadvertently change the intent of the original request.ASME procedures provide for reconsideration of any interpretation when or if additionalinforma
32、tion that might affect an interpretation is available. Further, persons aggrieved by aninterpretation 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 Meetin
33、gs. The B16 Standards Committee regularly holds meetings thatare open to the public. Persons wishing to attend any meeting should contact the Secretary ofthe B16 Standards Committee.viCopyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking per
34、mitted without license from IHS-,-,-ASME B16.38-2007LARGE METALLIC VALVES FOR GAS DISTRIBUTIONMANUALLY OPERATED, NPS 212(DN 65) TO NPS 12 (DN 300), 125 psig(8.6 bar) MAXIMUM1 SCOPE1.1 Valve TypesThis Standard covers requirements for manually oper-ated metallic valves in nominal sizes 212(DN 65) thro
35、ugh12 (DN 300) having the inlet and outlet on a commoncenterline. These valves are intended for controlling theflow of gas from open to fully closed positions, for usein distribution and service lines where the maximumgage pressure does not exceed 125 psig (8.6 bar). Valveseats, seals, and stem pack
36、ing may be nonmetallic.1.2 ApplicationThis 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
37、 syn-thetic natural gas (SNG), and liquefied petroleum gases(distributed as a vapor, with or without the admixtureof air) or mixtures thereof.1.3 Referenced StandardsStandards and specifications adopted by reference inthis Standard and the names and addresses of the spon-soring organizations are sho
38、wn in Mandatory AppendixI. It is not considered practical to refer to a specificedition of each of the standards and specifications inthe individual references. Instead, the specific editionreferences are included in Mandatory Appendix I. Aproduct made in conformance with a prior edition ofreference
39、 standards will be considered to be in confor-mance, even though the edition reference may bechanged in a subsequent revision of the standard.1.4 Quality SystemsNonmandatory requirements relating to the productmanufacturers Quality System Program are describedin Nonmandatory Appendix A.1.5 Conventio
40、nFor the purpose of determining conformance withthis Standard, the convention for fixing significant digitswhere limits, maximum or minimum values, shall be1“rounded off” as defined in ASTM Practice E 29. Thisrequires that an observed or calculated value shall berounded off to the nearest unit in th
41、e last right-handdigit used for expressing the limit. Decimal values andtolerances do not imply a particular method of mea-surement.1.6 Codes and RegulationsA valve used under the jurisdiction of a FederalRegulation, such as CFR Title 49, Part 192; the ASMECode for Pressure Piping, such as ASME B31.
42、8; or theNational Fuel Gas Code, Z223.1, is subject to any limita-tion of that code or regulation.1.7 DefinitionsNPS: nominal pipe sizeNVS: nominal valve sizeone bar: 100 kPaPTFE: materials that comply with ASTM D 4894,Specification for Polytetrafluoroethylene (PTFE)Granular Molding and Extrusion Ma
43、terialsAll pressures, unless otherwise stated, are gage pres-sures.2 CONSTRUCTION2.1 Conformance2.1.1 Each completed and assembled valve at thetime of manufacture and marked with the designationB16.38 shall be capable of meeting the requirements setforth in this Standard.2.1.2 Classes 125 and 150 va
44、lves (depending upontheir design) shall meet the requirements of one of thefollowing standards: MSS SP-67, MSS SP-70, MSS SP-72,MSS SP-78, MSS SP-80, MSS SP-84, ASME B16.34, andASME B16.42 (see Mandatory Appendix I).2.2 Tamperproof FeaturesWhere valves are specified to be tamperproof, theyshall be d
45、esigned and constructed to minimize the possi-ble removal of the core of the valve with other-than-specialized tools, e.g., tools other than commonwrenches, pliers, etc.Copyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without
46、license from IHS-,-,-ASME B16.38-20072.3 Configuration2.3.1 Closure Indication2.3.1.1 Valves designed for one-quarter turnoperation shall be designed to visually show the openand closed position of the valve. A rectangular stemhead or a position indicator shall indicate the closedposition of the val
47、ve port when the longitudinal axis ofthe stem head or indicator is perpendicular to the axisof the connecting pipe. If a separate indicator isemployed, it shall be designed such that it cannot beassembled to incorrectly indicate the position of thevalve.2.3.1.2 Valves shall close by clockwise stem r
48、ota-tion unless otherwise specified by the purchaser or bythe reference standard in para. 2.1.2. The direction forclosing shall be indicated.2.3.2 Valve Ends. Valve ends shall conform to thefollowing standards where applicable:(a) for threaded valve ends, ANSI/ASME B1.20.1(b) for flanged gray cast i
49、ron valve ends, ASME B16.1(c) for flanged ductile cast iron valve ends,ASME B16.42(d) for flanged steel valve ends, ASME B16.5(e) for flanged, butt-welding, and socket-weldingvalve ends, ASME B16.342.3.3 Dimensions. Face-to-face and end-to-enddimensions of valves (other than ball, butterfly, or dia-phragm valves) with flanged ends or butt-welding endsshall conform to the di
