1、AN AMERICAN NATIONAL STANDARD ASME B16.38-2012(Revision of ASME B16.38-2007)Large Metallic Valves for Gas DistributionManually Operated, NPS 2 (DN 65) to NPS 12 (DN 300), 125 psig (8.6 bar) MaximumASME B16.38-2012(Revision of ASME B16.38-2007)Large Metallic Valvesfor Gas DistributionManually Operate
2、d, NPS 212(DN 65) to NPS 12 (DN 300),125 psig (8.6 bar) MaximumAN AMERICAN NATIONAL STANDARDThree Park Avenue New York, NY 10016 USADate of Issuance: September 21, 2012The next edition of this Standard is scheduled for publication in 2017.ASME issues written replies to inquiries concerning interpret
3、ations of technical aspects of thisStandard. Periodically certain actions of the ASME B16 Committee may be published as Cases. Casesand interpretations are published on the ASME Web site under the Committee Pages athttp:/cstools.asme.org/ as they are issued.Errata to codes and standards may be poste
4、d on the ASME Web site under the Committee Pages toprovide corrections to incorrectly published items, or to correct typographical or grammatical errorsin codes and standards. Such errata shall be used on the date posted.The Committee Pages can be found at http:/cstools.asme.org/. There is an option
5、 available toautomatically receive an e-mail notification when errata are posted to a particular code or standard.This option can be found on the appropriate Committee Page after selecting “Errata” in the “PublicationInformation” section.ASME is the registered trademark of The American Society of Me
6、chanical 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
7、to participate. 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, proprietar
8、y device, 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, no
9、r assumes 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
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11、 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 EngineersThree Park Avenue, New York, NY 10016-5990Copyright 2012 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll
12、rights reservedPrinted in U.S.A.CONTENTSForeword ivCommittee Roster . vCorrespondence With the B16 Committee vi1 Scope . 12 Construction. 13 Qualification Requirements . 34 Production Testing . 4Figure1 Bend Test Assembly 5Tables1 Duration of Test 32 Bending Moment Values 43 Flow and Head Loss Coeff
13、icients 6Mandatory AppendixI References 7Nonmandatory AppendixA Quality System Program 8iiiFOREWORDThe 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.The 2007 edition of ASME B16.38 updated the 1985 Edition. All requirements were metricated, and thereferences were updated to the current revision. The paragraph on minimum levels of performance wasexpanded to describe valve types and their relevant standards. The section on “Lubricatio
22、n (Sealant)” wasrenamed “Injection Sealant,” and the paragraph was edited for clarity. Paragraphs 2.6 (“Pressure-ContainingMaterials”), 2.7 (“Gas Resistance”), and 2.8 (“Temperature Resistance”) were added. The section coveringelastomer components was new. Paragraph 3.2 (“Number of Tests”) was expan
23、ded to require that anymaterial 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 inte
24、rpretations 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 approvedthis American National Standa
25、rd on August 21, 2012.ivASME B16 COMMITTEEStandardization of Valves,Flanges, Fittings, and Gaskets(The following is the roster of the Committee at the time of approval of this Standard.)STANDARDS COMMITTEE OFFICERSW. B. Bedesem, ChairG. A. Jolly, Vice ChairC. E. OBrien, SecretarySTANDARDS COMMITTEE
26、PERSONNELA. Appleton, Alloy Stainless Products Co., Inc.R. W. Barnes, Anric Enterprises, Inc.W. B. Bedesem, ConsultantR. M. Bojarczuk, ExxonMobil Research however, they shouldnot contain proprietary names or information.Requests that are not in this format will be rewritten in this format by the Com
27、mittee priorto being answered, which may inadvertently change the intent of the original request.ASME procedures provide for reconsideration of any interpretation when or if additionalinformation that might affect an interpretation is available. Further, persons aggrieved by aninterpretation may app
28、eal 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 thatare open to the public. Persons wishing to atten
29、d any meeting should contact the Secretary ofthe B16 Standards Committee.viASME B16.38-2012LARGE 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
30、valves in nominal sizes 212(DN 65) through12 (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
31、 bar). Valveseats, seals, and stem packing 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
32、 natural gas, manufactured gas includes 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 o
33、f the spon-soring organizations are shown in MandatoryAppendix I. It is not considered practical to refer to aspecific edition of each of the standards and specifica-tions in the individual references. Instead, the specificedition references are included in Mandatory AppendixI. A product made in con
34、formance with a prior editionof referenced standards will be considered to be in con-formance, 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 describ
35、edin Nonmandatory Appendix A.1.5 ConventionFor determining conformance with this Standard, theconvention for fixing significant digits where limits(maximum or minimum values) are specified shall be1as defined in ASTM E29. This requires that an observedor calculated value be rounded off to the neares
36、t unitin the last right-hand digit used for expressing the limit.Decimal values and tolerances do not imply a particularmethod of measurement.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
37、 ASME B31.8; or theNational Fuel Gas Code, Z223.1, is subject to any limita-tion of that code or regulation.1.7 DefinitionsNPS: 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
38、Extrusion Materials.All pressures, unless otherwise stated, are gagepressures.2 CONSTRUCTION2.1 Conformance2.1.1 Each completed and assembled valve at thetime of manufacture and marked with the designation“B16.38” shall be capable of meeting the requirementsset forth in this Standard.2.1.2 Classes 1
39、25 and 150 valves (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, t
40、heyshall 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 commonwrenches, pliers, etc.ASME B16.38-20122.3 Configuration2.3.1 Closure Indication2.3.1.1 Valves designed for one-quarter turnoperation shall b
41、e designed to visually show the openand closed position of the valve. A rectangular stemhead or a position indicator shall indicate the closedposition of the valve port when the longitudinal axis ofthe stem head or indicator is perpendicular to the axisof the connecting pipe. If a separate indicator
42、 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 rota-tion unless otherwise specified by the purchaser or bythe reference standard in para. 2.1.2. The direction forclosing shall be indicate
43、d.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 iron 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 flang
44、ed, 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 dimensions contained in MSS SP-72.Face-to-face dimensions for but
45、terfly valves shall be inaccordance with dimensions contained in MSS SP-67.End-to-end dimensions of threaded end valves shall bein accordance with the manufacturers standarddimensions.2.4 MarkingEach valve, in addition to the markings required bythe applicable valve standard of para. 2.1.2, shall be
46、arthe marking “B16.38” or “B16.38T” if tamperproof fea-tures are included according to para. 2.2. Alternative tothe latter, the marking “T” may be shown on theoperating head or stem.2.5 Injection SealantA valve that utilizes injection of sealant through afitting that leads to the sealing surfaces sh
47、all be capableof having sealant injected in both the full-open and full-closed positions at an inlet pressure of 125 psig (8.6 bar).2.6 Pressure-Containing MaterialsMaterials for valve bodies, plugs, bonnets, unions,and other pressure-containing parts shall be in accor-dance with the applicable stan
48、dards of para. 2.1.2.22.7 Gas ResistanceAll materials, including lubricants and sealants, shallbe resistant to deterioration when exposed to fuel gasessuch as listed in para. 1.2.2.8 Temperature ResistanceThe materials used for valve bodies, plugs, bonnets,unions, and other pressure-containing parts
49、, excludinghandles, shall have a solidus temperature in excess of600F (427C).2.9 Elastomer Components2.9.1 Air Aging Tests. Elastomer parts that areexposed to fuel gas shall be made of materials that fol-lowing 70-hr air aging at 212F (100C) in accordancewithASTMD573meetelongation,tensile,andhardnessproperty requirements as specified in paras. 2.9.1.1 and2.9.1.2.2.9.1.1 Tensile tests shall be conducted in accor-dance with ASTM D412. Three dumbbells shall be airaged 70 hr at 212F (100C) in accordance withASTM D573. The dumbbells shall have a thickness of0.08 in. 0.
