1、Designation: F2138 12 (Reapproved 2017) An American National StandardStandard 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
2、 of revision, the year of last revision. A number in parentheses 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 th
3、ermoplastic natural gaspiping systems. However, it is expected 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
4、gas systemssuch as pipe, tubing, or fittings in sizes from12 CTS 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
5、piece of pipe, in aservice tee outlet, as part of a mechanical coupling, 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 cha
6、racteristics or contact theEFV manufacturer for test data for the installed 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
7、stated in inch-pound units are to be regardedas standard. The values given 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
8、 use. It is theresponsibility of the user of this standard to establish appro-priate safety, health and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.7 This international standard was developed in accor-dance with internationally recognized princip
9、les on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D1600 Terminology forAbbreviated T
10、erms Relating to Plas-ticsF412 Terminology Relating to Plastic Piping SystemsF1802 Test Method for Performance Testing of Excess FlowValvesF2897 Specification for Tracking and Traceability EncodingSystem of Natural Gas Distribution Components (Pipe,Tubing, Fittings, Valves, and Appurtenances)3. Term
11、inology3.1 Definitions:3.1.1 Definitions are in accordance with Terminology F412,unless otherwise specified. Abbreviations 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 pres
12、sure to equalize across thedevice to automatically reset to the open position after removalof a fault condition.3.1.3 excess 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
13、device exceeds a predetermined level.3.1.4 excess flow valve bypass, EFVB, nan EFV designedto limit the flow of gas after trip 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 t
14、he flow of gas after trip and to be resetmanually.3.1.6 leak rate, nthe flow of natural gas through anEFVNB after trip.1This specification 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
15、Aug. 1, 2017. Published September 2017. Originallyapproved in 2001. Last previous edition approved in 2012 as F213812. DOI:10.1520/F2138-12R17.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards vo
16、lume information, refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was develope
17、d in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.13.1.7 maximum inlet pr
18、essure, 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 the 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
19、 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 t
20、o stop or limit thepassage of natural gas.4. Ordering Information4.1 Purchasers should consider specifying the followingcharacteristics when ordering an EFV:4.1.1 EFVB or EFVNB,4.1.2 Trip flow (see 9.1.1),4.1.3 Maximum inlet pressure (see Section 7),4.1.4 Temperature rating range (see Section 8),4.1
21、.5 Minimum inlet pressure, and4.1.6 Special considerations for insertion of EFV.5. Materials and Manufacture5.1 The physical properties of each material used to producean EFV shall be available from the EFV manufacturer uponrequest.NOTE 1Materials in long-term contact with natural gas of line qualit
22、yshould be demonstrated to not adversely affect the performance of theEFV.NOTE 2Materials should have a demonstrated resistance to environ-mental stress cracking when exposed, under stress, to chemical com-pounds encountered in natural gas piping systems. Such compoundsinclude, but are not limited t
23、o, antifreeze solutions used to thaw frozenlines. The effects of liquid environments such as antifreeze agents,odorants, and hydrocarbons are known to be deleterious to some plastics,particularly when under service conditions.6. Dimensions6.1 The EFV shall be of appropriate dimensions for the pipeor
24、 fitting in which it is intended to be inserted.7. Maximum Inlet Pressure7.1 EFVs manufactured under this specification shall have amaximum inlet pressure of at least 125 psig.8. Temperature Rating Range8.1 EFVs manufactured under this specification shall have atemperature rating range of -20 to 140
25、F (-29 to 60C).9. Design Qualification Requirements9.1 Performance Requirements:9.1.1 Trip FlowThe trip flow shall not be less than theminimum trip flow stated by the EFV manufacturer and shallnot exceed 1.5 times the minimum trip flow stated by the EFVmanufacturer at any given pressure between the
26、minimum andmaximum inlet pressures, when tested in accordance with 12.2.9.1.2 Leak RateThe leak rate of an EFVNB shall notexceed 0.40 standard ft3/h (0.011 m3/h) when operating be-tween the minimum and maximum inlet pressures, when testedin accordance with 12.3.9.1.3 Bypass FlowThe bypass flow of an
27、 EFVB shall notexceed 20 standard ft3/h (0.566 m3/h) at a 10 psig (0.07 MPa)inlet pressure, when tested in accordance with 12.4.At all otherpressures between the minimum and maximum inlet pressures,the bypass flow of an EFVB shall not exceed the EFVmanufacturers stated value when tested in accordanc
28、e with12.4.9.1.4 Pressure DropThe pressure drop across the EFVshall not exceed the maximum pressure drop stated by the EFVmanufacturer at each flow rate listed in Test Method F1802,section 4.2.3, Pressure Drop at Flow Rates Less than Closure,and at all inlet pressures between the minimum and maximum
29、inlet pressures, when tested in accordance with 12.5.9.1.5 ResetThe EFV shall reset within the parametersstated by the EFV manufacturer at all inlet pressures betweenthe minimum and maximum inlet pressures, when tested inaccordance with 12.6.9.1.6 Snap Acting LoadsThe EFV shall not close whentested
30、in accordance with 12.7.9.1.7 Cycle TestingAfter the cycle testing described in12.8, the EFV shall meet the requirements of 9.1.1 and 9.1.2 or9.1.3.10. Samples10.1 The minimum sample size for testing against theperformance requirements of 9.1.1 9.1.5 shall be 25. Theminimum sample size for testing a
31、gainst the performancerequirements of 9.1.6 and 9.1.7 shall be 6.11. Specimen Preparation11.1 The tests required by this specification shall be per-formed on an EFV inserted in a straight section of pipe. TheEFV shall be centered between the pipe ends. There shall be atleast five diameters of straig
32、ht pipe on each side of the EFV, butthe total length of the straight section of pipe shall not exceed18 in. (45.7 cm).12. Test Methods12.1 General:12.1.1 EFV testing shall be done in accordance with TestMethod F1802, unless otherwise specified.12.1.2 EFV testing at temperatures other than those list
33、ed inTest Method F1802 may be necessary to establish the EFVtemperature rating.12.2 Trip flow shall be determined as described in TestMethod F1802, section 10.3, on Trip Flow.12.3 Leak rate for an EFVNB shall be determined asdescribed in Test Method F1802, section 10.4, Bypass Test orLeak Rate Test.
34、F2138 12 (2017)212.4 Bypass flow for an EFVB shall be determined asdescribed in F1802, section 10.4, Bypass Test or Leak RateTest.12.5 Pressure Drop:12.5.1 The pressure drop testing shall be done as describedin Test Method F1802, section 4.2.3, Pressure Drop at FlowRates Less than Closure.12.5.2 The
35、 pressure drop shall be calculated based on testresults obtained from the tests described in Test Method F1802.In Test Method F1802, section 10.6.1, System Pressure Drop,the EFV is replaced by an equivalent length of 1 in. (25.4 mm)IPS pipe. However, when using Test Method F1802 to deter-mine the pr
36、essure drop across an EFV, the EFV shall bereplaced with the same size and length of pipe without the EFV.To calculate the pressure drop, subtract the system pressuredrop in Test Method F1802, section 10.6.2, System PressureDrop, from the total pressure drop in Test Method F1802,section 10.5.7, Tota
37、l Pressure Drop.12.6 Reset of an EFVB shall be tested as described in TestMethod F1802, section 10.7, Reset.12.7 Snap Acting Load TestA test apparatus shall beassembled consisting of the following components in order:inlet supply pressure connection to EFV, no more than 60 ft(18.3 m) of 1 in. (2.54
38、cm) NPS pipe, full port14 turn ballvalve, no more than 2 ft (.61 m) of 1 in. (2.54 cm) NPS pipe,a flow control valve, no more than 4 ft (1.2 m) of 1 in. (2.54cm) NPS pipe, and a flowmeter venting to atmosphere. Inletpressure shall be 10 psig (0.07 MPa). With the ball valve open,set the flow control
39、valve so that the flowmeter indicates 75 %of the published EFV minimum trip flow. Completely close theball valve; then reopen the ball valve completely taking nomore than 0.5 s to open.12.8 Cycle TestingThis test shall be performed after allother tests in Section 12 have been completed. The EFV shal
40、lbe tripped and reset a minimum of 1000 times at the inletpressure of 125 psi. The EFV shall then be tested in accordancewith 12.2 and 12.3 or 12.4.13. Product Marking13.1 If the EFV manufacturer intends to sell the EFV toothers, the outer surface of the EFV shall be marked with thefollowing:13.1.1
41、ASTM F2138,13.1.2 Manufacturers name or trademark, and13.1.3 Coding that will enable the manufacturer to deter-mine the EFV model as well as the date and location ofmanufacture.13.2 If the EFV manufacturer inserts the EFV into pipe or apiping component prior to shipment to a customer, the mark-ings
42、shown below shall be placed on the outer surface of thepipe or piping component:13.2.1 ASTM F2138,13.2.2 Manufacturers name or trademark,13.2.3 Type of EFV: Bypass (EFVB) or Non By-Pass(EFVNB),13.2.4 Flow direction arrow,13.2.5 Nominal pipe size, and13.2.6 Coding that will enable the manufacturer to
43、 deter-mine the EFV model as well as the date and location ofmanufacture.13.3 If the EFV manufacturer supplies the EFV componentto another manufacturer for assembly into other products, theEFV manufacturer shall supply the information required by13.2 in an agreed upon format such that it can be plac
44、ed on theouter surface of the final pipe or piping component by the othermanufacturer.13.4 In addition to 13.1, 13.2, and 13.3 as applicable, EFVmanufacturers shall mark their component with the 16-character gas distribution component traceability identifier inaccordance with Specification F2897. Th
45、e 16-character codeshall be expressed in alpha-numeric format and Code 128 barcode format with a minimum bar thickness value of 0.005 in.or an alternative 1D or 2D bar code symbology as agreed uponbetween manufacturer and end user. All fittings shall have the16- character codes marked or affixed to
46、the product, productpackaging, or any manner agreed upon between manufacturerand end user.13.5 The manufacturer shall either ensure that the 16-character gas distribution component tracking and traceabilityidentifier in accordance with Specification F2897 for the pipeor tubing material is visible on
47、 the final product, or shallmaintain records for the 16-character code for the pipe ortubing materials, as necessary, to confirm the identification ofthese materials upon request by the end user.14. Production Testing14.1 The manufacturer shall test each EFV prior to ship-ment.14.2 The following tes
48、ts shall be performed on each EFV:14.2.1 Trip flow,14.2.2 Leak rate for EFVNBs,14.2.3 Bypass flow for EFVBs, and14.2.4 Reset testing.14.3 EFVs that do not meet the manufacturers publishedperformance requirements for the above tests shall be rejected.15. Quality Assurance15.1 When the product is mark
49、ed with this designation,F2138, the manufacturer affirms that the product wasmanufactured, inspected, sampled, and tested in accordancewith this specification and has been found to meet therequirements of this specification.16. Keywords16.1 excess flow valve; (EFV)F2138 12 (2017)3APPENDIX(Nonmandatory Information)X1. GUIDANCE ON EFV SELECTION AND INSTALLATIONX1.1 GeneralThis appendix is intended to assist ownersof natural gas systems in the selection of the appropriate EFVfor inclusion in a pipeline system and to determine the effectsof the EFV ins
