1、Manually Operated Thermoplastic Gas Shutoffs and Valves in Gas Distribution SystemsAN AMERICAN NATIONAL STANDARDASME B16.40-2008(Revision of ASME B16.40-2002)Copyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license fro
2、m IHS-,-,-ASME B16.40-2008(Revision of ASME B16.40-2002)Manually OperatedThermoplastic GasShutoffs and ValvesIn Gas DistributionSystemsAN AMERICAN NATIONAL STANDARDThree Park Avenue New York, NY 10016Copyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction o
3、r networking permitted without license from IHS-,-,-Date of Issuance: April 30, 2008The next edition of this Standard is scheduled for publication in 2013. There will be no addendaissued to this edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisS
4、tandard. 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 Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria f
5、or 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 participate. The proposed code or standard was madeavailable for public review and comment that provides
6、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 device, or activity.ASME does not take any position with respect to the validity of any patent rights asse
7、rted 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 assume any such liability. Users of a code or standard are expresslyadvised that determination of the vali
8、dity 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 industry is not to be interpreted asgovernment or industry endorsement of this code or standard.ASME accepts
9、 responsibility for only those interpretations of this document issued in accordance with the establishedASME procedures and policies, which precludes the issuance of interpretations by individuals.No part of this document may be reproduced in any form,in an electronic retrieval system or otherwise,
10、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 rights reservedPrinted in U.S.A.Copyright ASME International Provided by IHS under license with
11、 ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-CONTENTSForeword ivCommittee Roster . vCorrespondence With the B16 Committee vi1 Scope . 12 Construction. 23 Configuration 24 Pressure Rating 25 Marking . 26 Production and Qualification Testing 2Tables1 Duratio
12、n of Test 32 Maximum Operating Torque Values . 43 Sustained Test Pressures and Minimum Durations . 44 Flow and Head Loss Coefficients 5Mandatory AppendicesI Valve Design Pressure 7II References 8Nonmandatory AppendixA Quality System Program 9iiiCopyright ASME International Provided by IHS under lice
13、nse with 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 organizationalmeeting on November 21 of that year. The group operated as a Sectional Committee (laterredesignated as a
14、 Standards Committee) under the authorization of the American EngineeringStandards Committee subsequently named American Standards Association, United States ofAmerica Standards Institute, and now American National Standards Institute (ANSI). Sponsorsfor the group were the American Society of Mechan
15、ical Engineers, Manufacturers StandardizationSociety of the Valve and Fittings Industry, and the Heating and Piping Contractors NationalAssociation (later the Mechanical Contractors Association of America).The American Gas Association determined that standardization of gas valves used in distribu-ti
16、on systems was desirable and needed. The A.G.A. Task Committee on Standards for Valvesand Shutoffs was formed, and development work commenced in 1958. In 1968, it was determinedthat a more acceptable document would result if approval were gained from ANSI, and to facilitatesuch action, the A.G.A. Co
17、mmittee became Subcommittee No. 13 of the B16 activity. This B16group was later renamed Subcommittee L, which is its current designation.The first standard developed by Subcommittee L was B16.33. The B16.38 standard was subse-quently developed to cover larger sizes of gas valves and shutoffs. Since
18、about 1965, the increaseduse of plastic piping in gas distribution systems brought with it the need for valves and shutoffsof compatible material. To fill this need, the present standard was developed and initially appearedas ANSI B16.40-1977. Subcommittee L began review of this document in 1982.In
19、ANSI/ASME B16.40-1985, editorial changes were made throughout the text to bring theformat in line with the rest of the B16 series of standards and to clarify the intent of this Standard.Revisions included the addition of rules for allowable pressure at temperatures above 74F forvalves of certain mat
20、erials, updating of reference standards, and editorial changes to text andtables.In 2001, after several years and iterations, B16 Subcommittee L produced a fully reviseddocument. Among the many revisions were a new Definitions section, a new Impact Resistancesection, and a nonmandatory Quality Syste
21、ms Program Annex.Following approval by the B16 Standards Committee and the ASME Supervisory Board, thelast version of this Standard was approved as an American National Standard by ANSI onFebruary 6, 2002.This edition of the Standard was approved as an American National Standard by ANSI onMarch 18,
22、2008.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.ivCopyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproducti
23、on or networking permitted without license from IHS-,-,-ASME 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 OFFICERSH. R. Sonderegger, ChairM. L. Nayyar, Vice ChairU. DUr
24、so, SecretarySTANDARDS COMMITTEE PERSONNELR. W. Barnes, ANRIC EnterprisesW. B. Bedesem, ExxonMobil Research however, theyshould not contain proprietary names or information.Requests that are not in this format will be rewritten in this format by the Committee priorto being answered, which may inadve
25、rtently 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 appeal to the cognizant ASME Committee or Subcommi
26、ttee. 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, whichare open to the public. Persons wishing to attend any meeting should contact the Secretary of
27、the B16 Standards Committee.viCopyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ASME B16.40-2008MANUALLY OPERATED THERMOPLASTIC GAS SHUTOFFSAND VALVES IN GAS DISTRIBUTION SYSTEMS1 SCOPE1.1 General(a
28、) This Standard covers manually operated thermo-plastic valves in nominal valve sizes12through 12. Thesevalves are intended for use below ground in thermoplas-tic fuel gas distribution mains and service lines. Themaximum operating pressure (MOP) at which such dis-tribution piping systems may be oper
29、ated is in accor-dance with the Code of Federal Regulations (CFR) Title49, Part 192, Transportation of Natural and Other Gas byPipeline; Minimum Safety Standards, for temperatureranges of 20F to 140F (29C to 60C).(b) This Standard sets qualification requirements foreach basic valve design as a neces
30、sary condition fordemonstrating conformance to this Standard.(c) This Standard sets requirements for newly manu-factured valves for use in below-ground piping systemsfor fuel gas includes synthetic natural gas (SNG) andliquefied petroleum (LP) gases (distributed as a vapor,with or without the admixt
31、ure of air) or mixtures thereof.1.2 ReferencesStandards and specifications referenced under thisStandard are shown in Mandatory Appendix II.1.3 ConversionFor the purpose of determining conformance with thisStandard, the convention for fixing significant digits,where limits maximum or minimum values
32、are speci-fied, shall be “rounded off” as defined in ASTMPractice E 29. This requires that an observed or calcu-lated value shall be rounded off to the nearest unit inthe last right-hand digit used for expressing the limit.Decimal values and tolerances do not imply a particularmethod of measurement.
33、1.4 Relevant UnitsThe values stated in either inch or metric units are tobe regarded separately as standard. Within the text, thevalues stated in each system are not exact equivalents;therefore, each system must be used independently ofthe other. Combining values from the two systems mayresult in no
34、nconformance with the Standard.11.5 Definitionsbasic valve design: for a given valve design, each variationin material, size, or configuration of molded pressure-containing parts shall constitute a different basic valvedesign, except where minor design variations are pro-duced by differences in mach
35、ining of the same moldedpiece(s) to produce different end sizes or dimensionalratios (DRs).DR: the dimensional ratio defined as the pipe outsidediameter (O.D.) divided by the pipe wall thickness, t.DR p O.D./t.DRv: the valve DR equivalent is the designated valveDR based on the lowest DR of the ASTM
36、D 2513 pipeends used in long-term hydrostatic testing under thisStandard.fasteners: nuts, bolts, washers, clip rings, and otherdevices used in the assembly of valves.lubricated valves: valves that require pressure lubricationto effect a leak-tight seal (by the insertion through fit-tings of lubrican
37、t to the sealing surfaces of the valve).NVS: nominal valve size.pressure: unless otherwise stated, pressure is gagepressure.production pressure tests: pressure tests that include seatand closure-member and shell tests.seat and closure-member test: an internal pressure test ofclosure-sealing elements
38、 (seats, seals, and closure mem-bers, such as gate, disc, ball, or plug).shell test: an internal pressure test of the pressure-con-taining envelope.valve design pressure: the pressure calculated by themethod described in Mandatory Appendix I using thevalve shell materials Hydrostatic Design Basis (H
39、DB)at 73F (23C).1.6 Quality SystemsNonmandatory requirements relating to the productmanufacturers Quality System Program are describedin Nonmandatory Appendix A.Copyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license
40、from IHS-,-,-ASME B16.40-20082 CONSTRUCTION2.1 General(a) The workmanship used in the manufacture andassembly of each valve shall provide gas tightness, safetyand reliability of performance, and freedom from injuri-ous imperfections and defects.(b) Design details not addressed in this Standard areth
41、e responsibility of the manufacturer.2.2 Materials2.2.1 Valve Shell. The pressure-containing valveshell shall be made from either polyethylene (PE) orpolyamide 11 (PA-11) materials specified in and quali-fied to the requirements for pipe and fittings as listedin ASTM D 2513.2.2.2 Parts Other Than th
42、e Valve Shell. Parts otherthan the valve shell, which contribute to pressure con-tainment or retaining differential pressure across theclosure element, shall be resistant to the gases in para.1.1(c). Such parts shall be designed to withstand normalvalve-operating loads and, in addition, shall provid
43、elong-term pressure-containment integrity consistentwith the valve shell. The sustained pressure tests of para.6.3.3 shall qualify the design and material selected forthese parts, which include, but are not limited to, theclosure member, stems or shafts (if they are designedto retain pressure), and
44、fasteners retaining shell sections.2.2.3 Lubricants and Sealants. Lubricants and seal-ants shall be resistant to the action of gases referred toin para. 1.1(c). Lubricated valves, as defined in para. 1.5,are not within the scope of this Standard.2.2.4 Responsibility. When service conditions, suchas
45、gases having high hydrogen content or compoundslikely to form condensate, dictate special materials con-siderations, it is the users responsibility to specify thisinformation to the manufacturer.3 CONFIGURATION3.1 Operating Indication(a) Valves designed for one-quarter turn operationshall be designe
46、d to visually show the open and closedposition of the valve. A rectangular stem head withan arrow thereon or a separate position indicator shallindicate the closed position of the valve port when thelongitudinal axis of the stem head or indicator is perpen-dicular to the axis of the connecting pipe.
47、 If a separateindicator is used, it shall be designed such that it cannotbe assembled to incorrectly indicate the position of thevalve.(b) Valves designed for more than one-quarter turnoperation shall close by clockwise stem rotation, unlessotherwise specified by the user. The direction for closingt
48、he valve shall be indicated.23.2 Valve End DesignValve ends shall be designed to one or more of thefollowing, unless otherwise specified by the user:(a) PE or PA-11 valve stub-ends that conform to theapplicable dimensions of ASTM D 3261, F 1733, or D 2513(b) polyethylene socket ends that conform to
49、theapplicable dimensions listed in Tables 1 and 2 ofASTM D 2683(c) integral mechanical joints that meet the require-ments of the applicable paragraphs under CFR, Title 49,Part 192, Subpart F, Joining of Material Other Than byWelding4 PRESSURE RATING4.1 Maximum Pressure RatingThe maximum pressure rating of each valve is thevalve design pressure as defined in para. 1.5
