1、Designation:F213809 Designation: F2138 12An 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 cas
2、e 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 methods for excess flow valves for use in
3、thermoplastic natural gas pipingsystems. However, it is expected that excess flow valves manufactured to the requirements of this specification may also be usedin other natural gas piping systems.1.2 Excess flow valves covered by this specification are designed for insertion into components for natu
4、ral gas systems suchas pipe, tubing, or fittings in sizes from 1/212 CTS to 2 IPS.1.3 The tests required by this specification are intended to determine the performance characteristics of an excess flow valveinstalled in a straight piece of pipe. An excess flow valve could possibly be installed in a
5、 straight piece of pipe, in a service teeoutlet, as part of a mechanical coupling, or in other configurations. The performance characteristics of the excess flow valve maybe significantly different for each installed configuration. Users should conduct their own tests to determine the installedperfo
6、rmance characteristics or contact the EFV manufacturer for test data for the installed configuration. Additional guidance onselection and installation of excess flow valves is included in Appendix X1.1.4 The tests required by this specification are not intended to be routine quality control tests.1.
7、5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information only and are not considered standard.1.6 This standard does not purport to address all of the safety concerns, if any, ass
8、ociated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatoryrequirements prior to use.2. Referenced Documents2.1 ASTM Standards:2D1600 Terminology for Abbreviated Terms Relating to Plasti
9、csF412 Terminology Relating to Plastic Piping SystemsF1802 Test Method for Performance Testing of Excess Flow Valves Test Method for Performance Testing of Excess FlowValvesF2897 Specification for Tracking and Traceability Encoding System of Natural Gas Distribution Components (Pipe, Tubing,Fittings
10、, Valves, and Appurtenances)3. Terminology3.1 Definitions of Terms:3.1.1 Definitions are in accordance with Terminology F412, unless otherwise specified. Abbreviations are in accordance withTerminology D1600.3.1.2 bypass flow, nan intentional rate of passage of natural gas through an EFVB after trip
11、, which will allow upstream anddownstream pressure to equalize across the device to automatically reset to the open position after removal of a fault condition.3.1.3 excess flow valve, EFV, na device installed in a natural gas piping system to automatically stop or limit the passage ofnatural gas wh
12、en the rate of passage of natural gas through the device exceeds a predetermined level.3.1.4 excess flow valve bypass, EFVB, nan EFV designed to limit the flow of gas after trip to a small predetermined level andto reset automatically after the pressure is equalized across the valve.3.1.5 excess flo
13、w valve non-bypass, EFVNB, nan EFV designed to stop the flow of gas after trip and to be reset manually.1This specification is under the jurisdiction of ASTM Committee F17 on Plastic Piping Systems and is the direct responsibility of Subcommittee F17.60 on Gas.Current edition approved March 1, 2009.
14、 Published April 2009. Originally approved in 2001. Last previous edition approved in 2001 as F2138011. DOI:10.1520/F2138-09.Current edition approved April 1, 2012. Published May 2012. Originally approved in 2001. Last previous edition approved in 2009 as F213809. DOI: 10.1520/F2138-12.2For referenc
15、ed ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.1This document is not an ASTM standard and is intended only to provide t
16、he user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the stand
17、ard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.1.6 leak rate, nthe flow of natural gas through an
18、EFVNB after trip.3.1.7 maximum inlet pressure, nthe maximum pressure, as stated by the EFV manufacturer, at which an EFV is designed tofunction.3.1.8 minimum inlet pressure, nthe minimum pressure, as stated by the EFV manufacturer, at which an EFV is designed tofunction.3.1.9 pipe, nrefers to both p
19、ipe and tubing.3.1.10 reset, vchanging an EFV from a closed position to an open position.3.1.11 temperature rating, nthe temperature range, as stated by the EFV manufacturer, within which an EFV is designed tofunction.3.1.12 trip, nclosure of an EFV.3.1.13 trip flow, nthe rate of passage of natural
20、gas through an EFV that will cause the EFV to stop or limit the passage ofnatural gas.4. Ordering Information4.1 Purchasers should consider specifying the following characteristics 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
21、 Temperature rating range (see Section 8),4.1.5 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 produce an EFV shall be available from the EFV manufacturer uponrequest.NOTE 1Materials in lon
22、g-term contact with natural gas of line quality should be demonstrated to not adversely affect the performance of the EFV.NOTE 2Materials should have a demonstrated resistance to environmental stress cracking when exposed, under stress, to chemical compoundsencountered in natural gas piping systems.
23、 Such compounds include, but are not limited to, antifreeze solutions used to thaw frozen lines. The effectsof liquid environments such as antifreeze agents, odorants, and hydrocarbons are known to be deleterious to some plastics, particularly when under serviceconditions.6. Dimensions6.1 The EFV sh
24、all be of appropriate dimensions for the pipe or fitting in which it is intended to be inserted.7. Maximum Inlet Pressure7.1 EFVs manufactured under this specification shall have a maximum inlet pressure of at least 125 psig.8. Temperature Rating Range8.1 EFVs manufactured under this specification s
25、hall have a temperature rating range of -20 to 140F (-29 to 60C).9. Design Qualification Requirements9.1 Performance Requirements:9.1.1 Trip FlowThe trip flow shall not be less than the minimum trip flow stated by the EFV manufacturer and shall notexceed 1.5 times the minimum trip flow stated by the
26、 EFV manufacturer at any given pressure between the minimum andmaximum inlet pressures, when tested in accordance with 12.2.9.1.2 Leak RateThe leak rate of an EFVNB shall not exceed 0.40 standard ft3/h (0.011 m3/h) when operating between theminimum and maximum inlet pressures, when tested in accorda
27、nce with 12.3.9.1.3 Bypass FlowThe bypass flow of an EFVB shall not exceed 20 standard ft3/h (0.566 m3/h) at a 10 psig (0.07 MPa) inletpressure, when tested in accordance with 12.4. At all other pressures between the minimum and maximum inlet pressures, thebypass flow of an EFVB shall not exceed the
28、 EFV manufacturers stated value when tested in accordance with 12.4.9.1.4 Pressure DropThe pressure drop across the EFV shall 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
29、, and atall inlet pressures between the minimum and maximum inlet pressures, when tested in accordance with 12.5.9.1.5 ResetThe EFV shall reset within the parameters stated by the EFV manufacturer at all inlet pressures between theminimum and maximum inlet pressures, when tested in accordance with 1
30、2.6.9.1.6 Snap Acting LoadsThe EFV shall not close when tested in accordance with 12.7.9.1.7 Cycle TestingAfter the cycle testing described in 12.8, the EFV shall meet the requirements of 9.1.1 and 9.1.2 or 9.1.3.10. Samples10.1 The minimum sample size for testing against the performance requirement
31、s of 9.1.1-9.1.5 shall be 25. The minimumF2138 122sample size for testing against the performance requirements of 9.1.6 and 9.1.7 shall be 6.11. Specimen Preparation11.1 The tests required by this specification shall be performed on an EFV inserted in a straight section of pipe. The EFV shallbe cent
32、ered between the pipe ends. There shall be at least five diameters of straight pipe on each side of the EFV, but the total lengthof the straight section of pipe shall not exceed 18 in. (45.7 cm).12. Test Methods12.1 General:12.1.1 EFV testing shall be done in accordance with Test Method F1802, unles
33、s otherwise specified.12.1.2 EFV testing at temperatures other than those listed in Test Method F1802 may be necessary to establish the EFVtemperature rating.12.2 Trip flow shall be determined as described in Test Method F1802, section 10.3, on Trip Flow.12.3 Leak rate for an EFVNB shall be determin
34、ed as described in Test Method F1802, section 10.4, Bypass Test or Leak RateTest.12.4 Bypass flow for an EFVB shall be determined as described in F1802, section 10.4, Bypass Test or Leak Rate Test.12.5 Pressure Drop:12.5.1 The pressure drop testing shall be done as described in Test Method F1802, se
35、ction 4.2.3, Pressure Drop at Flow RatesLess than Closure.12.5.2 The pressure drop shall be calculated based on test results obtained from the tests described in Test Method F1802. InTest Method F1802, section 10.6.1, System Pressure Drop, the EFV is replaced by an equivalent length of 1 in. (25.4 m
36、m) IPSpipe. However, when using Test Method F1802 to determine the pressure drop across an EFV, the EFV shall be replaced with thesame size and length of pipe without the EFV. To calculate the pressure drop, subtract the system pressure drop in Test MethodF1802, section 10.6.2, System Pressure Drop,
37、 from the total pressure drop in Test Method F1802, section 10.5.7, Total PressureDrop.12.6 Reset of an EFVB shall be tested as described in Test Method F1802, section 10.7, Reset.12.7 Snap Acting Load TestA test apparatus shall be assembled consisting of the following components in order: inlet sup
38、plypressure connection to EFV, no more than 60 ft (18.3 m) of 1 in. (2.54 cm) NPS pipe, full port14 turn ball valve, no more than2 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. (2.54 cm) NPS pipe, and aflowmeter venting to atmosphere. Inlet pressure
39、 shall be 10 psig (0.07 MPa). With the ball valve open, set the flow control valveso that the flowmeter indicates 75 % of the published EFV minimum trip flow. Completely close the ball valve; then reopen theball valve completely taking no more than 0.5 s to open.12.8 Cycle TestingThis test shall be
40、performed after all other tests in Section 12 have been completed. The EFV shall betripped and reset a minimum of 1000 times at the inlet pressure of 125 psi. The EFV shall then be tested in accordance with 12.2and 12.3 or 12.4.13. Product Marking13.1 If the EFV manufacturer intends to sell the EFV
41、to others, the outer surface of the EFV shall be marked with the following:13.1.1 ASTM F2138,13.1.2 Manufacturers name or trademark, and13.1.3 Coding that will enable the manufacturer to determine the EFV model as well as the date and location of manufacture.13.2 If the EFV manufacturer inserts the
42、EFV into pipe or a piping component prior to shipment to a customer, the markingsshown below shall be placed on the outer surface of the pipe 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 ar
43、row,13.2.5 Nominal pipe size, and13.2.6 Coding that will enable the manufacturer to determine the EFV model as well as the date and location of manufacture.13.3 If the EFV manufacturer supplies the EFV component to another manufacturer for assembly into other products, the EFVmanufacturer shall supp
44、ly the information required by 13.2 in an agreed upon format such that it can be placed on the outer surfaceof the final pipe or piping component by the other manufacturer.13.4 In addition to 13.1, 13.2, and 13.3 as applicable, EFV manufacturers shall mark their component with the 16-character gasdi
45、stribution component traceability identifier in accordance with Specification F2897. The 16-character code shall be expressed inalpha-numeric format and Code 128 bar code format with a minimum bar thickness value of 0.005 in. or an alternative 1D or 2Dbar code symbology as agreed upon between manufa
46、cturer and end user. All fittings shall have the 16- character codes marked oraffixed to the product, product packaging, or any manner agreed upon between manufacturer and end user.13.5 The manufacturer shall either ensure that the 16-character gas distribution component tracking and traceability id
47、entifierin accordance with Specification F2897 for the pipe or tubing material is visible on the final product, or shall maintain records forF2138 123the 16-character code for the pipe or tubing materials, as necessary, to confirm the identification of these materials upon requestby the end user.14.
48、 Production Testing14.1 The manufacturer shall test each EFV prior to shipment.14.2 The following tests 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 published performance
49、 requirements for the above tests shall be rejected.15. Quality Assurance15.1 When the product is marked with this designation, F2138, the manufacturer affirms that the product was manufactured,inspected, sampled, and tested in accordance with this specification and has been found to meet the requirements of thisspecification.16. Keywords16.1 excess flow valve; (EFV)APPENDIX(Nonmandatory Information)X1. GUIDANCE ON EFV SELECTION AND INSTALLATIONX1.1 GeneralThis appendix is intended to assist owners of natural gas systems in the selection of the ap
