1、Designation:F213812Standard Specification forExcess Flow Valves for Natural Gas Service1This standard is issued under the fixed designation F2138;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in p
2、arentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification covers requirements and test methodsfor excess flow valves for use in thermoplastic natural gaspiping systems.However,it is expect
3、ed that excess flow valvesmanufactured to the requirements of this specification may alsobe used in other natural gas piping systems.1.2 Excess flow valves covered by this specification aredesigned for insertion into components for natural gas systemssuch as pipe,tubing,or fittings in sizes from12CT
4、S to 2 IPS.1.3 The tests required by this specification are intended todetermine the performance characteristics of an excess flowvalve installed in a straight piece of pipe.An excess flow valvecould possibly be installed in a straight piece of pipe,in aservice tee outlet,as part of a mechanical cou
5、pling,or in otherconfigurations.The performance characteristics of the excessflow valve may be significantly different for each installedconfiguration.Users should conduct their own tests to deter-mine the installed performance characteristics or contact theEFV manufacturer for test data for the ins
6、talled configuration.Additional guidance on selection and installation of excessflow valves is included in Appendix X1.1.4 The tests required by this specification are not intendedto be routine quality control tests.1.5 The values stated in inch-pound units are to be regardedas standard.The values g
7、iven in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.6 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish a
8、ppro-priate safety and health practices and determine the applica-bility of regulatory requirements prior to use.2.Referenced Documents2.1 ASTM Standards:2D1600 Terminology forAbbreviated Terms Relating to Plas-ticsF412 Terminology Relating to Plastic Piping SystemsF1802 Test Method for Performance
9、Testing of Excess FlowValvesF2897 Specification for Tracking and Traceability EncodingSystem of Natural Gas Distribution Components(Pipe,Tubing,Fittings,Valves,and Appurtenances)3.Terminology3.1 Definitions:3.1.1 Definitions are in accordance with Terminology F412,unless otherwise specified.Abbrevia
10、tions are in accordancewith Terminology D1600.3.1.2 bypass flow,nan intentional rate of passage ofnatural gas through an EFVB after trip,which will allowupstream and downstream pressure to equalize across thedevice to automatically reset to the open position after removalof a fault condition.3.1.3 e
11、xcess flow valve,EFV,na device installed in anatural gas piping system to automatically stop or limit thepassage of natural gas when the rate of passage of natural gasthrough the device exceeds a predetermined level.3.1.4 excess flow valve bypass,EFVB,nan EFV designedto limit the flow of gas after t
12、rip to a small predetermined leveland to reset automatically after the pressure is equalized acrossthe valve.3.1.5 excess flow valve non-bypass,EFVNB,nan EFVdesigned to stop the flow of gas after trip and to be resetmanually.3.1.6 leak rate,nthe flow of natural gas through anEFVNB after trip.1This s
13、pecification is under the jurisdiction of ASTM Committee F17 on PlasticPiping Systems and is the direct responsibility of Subcommittee F17.60 on Gas.Current edition approved April 1,2012.Published May 2012.Originallyapproved in 2001.Last previous edition approved in 2009 as F213809.DOI:10.1520/F2138
14、-12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this stand
15、ardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.7 maximum inlet pressure,nthe maximum pressure,asstated by the EFV manufacturer,at which an EFV is designedto function.3.1.8 minimum inlet pressure,nthe minimum pressure,asstated by t
16、he EFV manufacturer,at which an EFV is designedto function.3.1.9 pipe,nrefers to both pipe and tubing.3.1.10 reset,vchanging an EFV from a closed position toan open position.3.1.11 temperature rating,nthe temperature range,asstated by the EFV manufacturer,within which an EFV isdesigned to function.3.1.12 trip,nclosure of an EFV.3.1.13 trip flow,nthe rate of passage of natural gasthrough an EFV that will cause the EFV to stop or limit thepassage of natural gas.4.Ordering Information4.1 Purchasers
