1、Designation: F 1802 04An American National StandardStandard Test Method forPerformance Testing of Excess Flow Valves1This standard is issued under the fixed designation F 1802; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the ye
2、ar of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers a standardized method todetermine the performance of excess flow valves (EFVs)designed
3、to limit flow or stop flow in thermoplastic natural gasservice lines.21.2 All tests are intended to be performed using air as thetest fluid. Unless otherwise stated, all flow rates are reported instandard cubic feet per hour of 0.6 relative density natural gas.1.3 The test method recognizes two type
4、s of EFV. One type,an excess flow valve-bypass (EFVB), allows a small amount ofgas to bleed through (bypass) after it has tripped, usually as ameans of automatically resetting the device. The second type,an excess flow valve-non bypass (EFVNB), is intended to tripshut forming an essentially gas tigh
5、t seal.1.4 The performance characteristics covered in this testmethod include flow at trip point, pressure drop across theEFV, bypass flow rate of the EFVB or leak rate through theEFVNB after trip, and verification that the EFV can be reset.1.4.1 Gas distribution systems may contain condensates andp
6、articulates such as organic matter, sand, dirt, and iron com-pounds. Field experience has shown that the operating charac-teristics of some EFVs may be affected by accumulations ofthese materials. The tests of Section 11 were developed toprovide a simple, inexpensive, reproducible test that quantifi
7、esthe effect, if any, of a uniform coating of kerosene and ofkerosene contaminated with a specified amount of ferric oxidepowder on an EFVs operating characteristics.1.5 Excess flow valves covered by this test method willnormally have the following characteristics: a pressure ratingof up to 125 psig
8、 (0.86 MPa); a trip flow of between 200 and2500 ft3/h (5.66 and 70.8 m3/h) at 10 psig (0.07 MPa); aminimum temperature rating of 0F(18C), and a maximumtemperature rating of 100F (38C).1.6 The EFVs covered by this test method shall be con-structed to fit piping systems no smaller than12 CTS and nolar
9、ger than 114 IPS, including both pipe and tubing sizes.1.7 Tests will be performed at 67 6 10F (19.4 6 5.5C).Alternative optional test temperatures are 100 6 10F (37.7 65.5C) and 0 6 10F (18 6 5.5C). All flow rates must becorrected to standard conditions.1.8 This test method was written for EFVs ins
10、talled inthermoplastic piping systems. However, it is expected that thetest method may also be used for similar devices in otherpiping systems.1.9 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 standar
11、d to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. For specificprecautions, see Section 8.2. Referenced Documents2.1 ASTM Standards:3D 1600 Terminology for Abbreviations, Acronyms, andCodes for Terms Relating to PlasticsF
12、412 Terminology Relating to Plastic Piping Systems2.2 ANSI Standard:B31.8 Gas Transmission and Distribution Piping Systems42.3 Federal Specification:DOT Part 192 Title 49 Code of Federal Regulations53. Terminology3.1 Definitions:3.1.1 GeneralDefinitions are in accordance with Termi-nology F 412, unl
13、ess otherwise specified. Abbreviations are inaccordance with Terminology D 1600.3.1.2 The gas industry terminology used in this test methodis in accordance with ANSI B31.8 or DOT Part 192 Title 49,unless otherwise indicated.1This test method is under the jurisdiction of ASTM Committee F17 on Plastic
14、Piping Systems and is the direct responsibility of Subcommittee F17.40 on TestMethods.Current edition approved April 1, 2004. Published April 2004. Originallyapproved in 1995 as PS 1395. Last previous edition approved 1997 as F180297.2This contamination test procedure may be utilized to determine th
15、e effect, ifany, of contaminants from a specific gas distribution system on the operationalcharacteristics of an EFV under consideration for use in that system. Condensates,oils and particulates removed from that distribution system could be substituted forkerosene and iron oxide. Results obtained f
16、rom using reagents or contaminants otherthan those specified in this test method must not be used in comparison with resultsobtained using the reagents specified in this test method.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.o
17、rg. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.4Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036.5Available from Superintendent of Documents, U.S. Government PrintingOff
18、ice, 732 N. Capitol Street, NW, Washington, DC 20402.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.2 Definitions of Terms Specific to This Standard:3.2.1 bypass flow, nthe flow through an EFVB after it hasbeen activated or trippe
19、d.3.2.2 excess flow valve (EFV), na device installed in anatural gas service line having the ability to automatically stopor limit the flow of gas in the event that the flow in the serviceline exceeds a predetermined level.3.2.2.1 excess flow valve-bypass (EFVB), nan EFV de-signed to limit the flow
20、of gas upon closure to a smallpredetermined level. The EFVBs reset automatically, once theservice line downstream is made gas tight and pressure isequalized across the valve.3.2.2.2 excess flow valve-non bypass (EFVNB), nan EFVwhich is designed to stop the flow of gas upon closure. TheEFVNBs must be
21、 manually reset.3.2.3 leak rate, nthe flow of test fluid passing through anEFVNB after it has been activated or tripped.3.2.4 Piezometer ring, na device installed at a pressuremeasurement point in a flowing gas stream intended toeliminate the effect of the flowing gas on the measurementdevice. See A
22、ppendix X1.3.2.5 pipe, nrefers to both pipe and tubing.3.2.6 standard conditions, nfor gas flow conversion, 0.6relative density natural gas at 14.7 psia (0.1 MPa) and 60F(16.6 C).3.2.7 trip, nactivation of the mechanism of an EFV tostop or limit the flow of natural gas in the service line.3.2.8 trip
23、 flow, nthe flow passing through an EFV re-quired to cause its activation to stop or limit flow.4. Summary of Test Method4.1 For all tests, air is intended to be the test fluid. All flowsare given in cubic feet per hour of 0.6 relative density naturalgas, unless otherwise specified. All tests are to
24、 be performed at67 6 10F (19.4 6 5.5C), with alternative test temperatures of0 and 100F (17.7 and 37.7C). All flow rates must becorrected to standard conditions using the temperature of theair flow measured just upstream of the flowmeter (T3)inFig.1.4.2 The EFV is installed in the standardized test
25、apparatusshown in Fig. 1. This apparatus provides regulated inletpressure, pressure measurement at specified locations, tem-perature measurement, flow measurement, and flow control.Four discrete tests are performed on each sample, as follows:4.2.1 Trip Flow RateThe EFV is installed in the testappara
26、tus and the flow control valve is slowly opened. At thetrip point, the inlet pressure and flow rate are recorded.4.2.2 Bypass or Leak RateAfter completion of trip flowrate test, the flow past the tripped device is measured onFlowmeter 2. For an EFVB, this flow is the bypass flow. For anEFVNB, this f
27、low is the leak rate.4.2.3 Pressure Drop at Flow Rates Less than Closureaftersetting the inlet pressure to the desired value, pressure dropmeasurements shall be taken at each of the following flow ratesthat are less than the valves minimum closure flow rate: 100,200, 300, 400, 500, 750, 1000, 1250,
28、and 1500 SCFH (2.8, 5.6,8.5, 11.32, 14.2, 21.24, 28.3, 35.4, and 42.5 M3/h).4.2.4 ResetFollowing the manufacturers instructions,verify that the EFV can be reset.FIG. 1 Test Apparatus For Excess Flow ValvesF18020425. Significance and Use5.1 This test method is intended to be used for the evalua-tion
29、of EFVs manufactured for use on residential and smallcommercial thermoplastic natural gas service lines. Possibleapplications of the test include product design and qualitycontrol testing by a manufacturer and product acceptancetesting by a natural gas utility.5.2 The user of this test method should
30、 be aware that theflows and pressures measured in the test apparatus may notcorrelate well with those measured in a field installation.Therefore, the user should conduct sufficient tests to ensurethat any specific EFV will carry out its intended function in theactual field installation used.6. Appar
31、atus6.1 Test Apparatus, (See Fig. 1) consisting of a compressedair supply, valves, flowmeters, Piezometer rings located at eachpressure test point, pressure gages, and thermocouples.6.1.1 The size and capabilities of the test system should beselected to meet the needs of the application. A test syst
32、em forEFVs of one size and a single pressure range may be much lesssophisticated than one designed for a wide range of sizes andmultiple operating pressure ranges.6.2 Compressed Air Supply System:6.2.1 The air supply system shall be able to provide cleandry air at the required test temperature for a
33、 time sufficient toobtain a test data point at the highest test pressure and at themaximum flow rate of the EFV being tested. Such a require-ment may be met either by a low-volume compressor and alarge pressure vessel or by a high-volume compressor and asmaller pressure vessel.6.2.2 This test method
34、 is intended for maximum air flows upto 2500 ft3/h (70.8 m3/h). However, for many applications, anominal requirement would be for an air flow of 1000 ft3/h(28.32 m3/h) at a pressure of 100 psig (0.7 MPa) for a periodof 60 s.6.3 Piezometer Rings:6.3.1 A Piezometer ring shall be used at each pressure
35、testpoint as shown in Fig. 1.6.3.2 Piezometer rings are designed to provide a flow-independent measurement of the pressure in a pipe. They areessential in pipes with flowing gas in them. Appendix X1shows the dimensions for construction of a Piezometer ring.6.4 Pressure and Differential Pressure Gage
36、s:6.4.1 Each air pressure gage or differential pressure gageshall measure the range of pressures at its location in the testapparatus to an accuracy within 62%.6.4.2 Differential pressure gages shall be rated for pressuresabove the maximum encountered in the application.NOTE 1Do not use “snubs” on p
37、ressure gages.6.5 Flowmeters:6.5.1 Each flowmeter shall measure the range of flows at itslocation in the test apparatus to an accuracy within 62%,traceable to the National Institute of Standards and Technology.Note that flowmeter accuracy is usually expressed as a percentof the full scale reading. T
38、herefore, to maintain accuracy it isgenerally advisable to operate the meter at as high a flow aspossible.6.5.2 Each flowmeter shall have manufacturer suppliedcorrection factors for conversion of air flow rates measured atthe metering pressure and temperature to corrected flow ratesof 0.6 relative d
39、ensity natural gas at standard conditions. Someusers have found it convenient to use flowmeters calibrated tomeasure air, but that indicate flow rates for natural gas.6.5.3 Flowmeters shall not generate pressure or flow fluc-tuations in the flowing air stream that could adversely affecteither the me
40、asurement of these values or the operation of theEFV.6.5.4 Flowmeters shall be easy to clean and to keep clean.6.5.5 Flow Control Valve BThis valve, as it is movedfrom full closed to full open, shall be capable of producing auniformly increasing air flow. An NPS 1 valve such as a fullport globe or g
41、ate valve or automated flow device have beenfound satisfactory.6.5.6 Inlet Valve A, Bypass Valves D, E, F, and Flow ControlValve CThese shall be full port NPS 1 valves.6.6 PipingUsing Schedule 40, NPS 1 steel for inlet andoutlet piping and associated fittings for the EFV.6.7 ThermocoupleThree thermo
42、couples are required andshall measure temperature to an accuracy of 63F (1.7C).One shall be installed so as to measure the temperature of theEFV being tested. Two shall be installed in the flowing airstream to measure the temperature immediately upstream ofFlowmeter 1, and immediately upstream of th
43、e EFV under test.6.8 Temperature ControlThe apparatus to control testtemperature shall be such that the temperature of the EFV (T1)and of the air flow measured by the thermocouple upstream ofthe flowmeter (T3) shall be within 610F of 67F (5.5C of19.4C). For testing at 0F (17.7C) and at 100F (37.7C),
44、the temperature of the EFV (T1) shall be within 610F (5.5C)of the test temperature. The test apparatus and test EFV shall beinsulated as appropriate so as to maintain the test temperature.6.9 Reset VolumeA 60 ft (18.28 m) long coil of12 CTS0.090 in. (23 mm) wall PE tubing or pipe with an equivalentv
45、olume of 112 in.3(1,835 cm3). The inside coil radius shall notbe less than 16 in. (406.4 mm) (minimum bend radius = 25times the outside tube diameter).7. Sample Preparation7.1 The user of this test method will select the EFVconfiguration to be tested. However, the configuration willaffect the test r
46、esults. For example, the pressure drop and thetrip-flow rate values will be different when the EFV is insertedin a straight length of thermoplastic pipe, as compared to anEFV inserted in the outlet of a thermoplastic punch tee. Thismust be borne in mind when selecting the sample configura-tion.7.2 A
47、ny adapters used to install the EFV in the testapparatus shall not restrict the flow to a degree which contrib-utes to the measured pressure drop. In addition, these adaptersshall not generate pressure or fluctuations in the flowing airstream that could adversely affect either the measurement ofthes
48、e values or the operation of the EFV. Five samples of eachEFV shall be tested in accordance with Section 10.F18020438. Precautions and Safety Considerations8.1 Test personnel shall be trained in the use and operationof this test apparatus and be familiar with safe use ofcompressed air. Any outlets o
49、r relief vents from the air systemshould be directed away from the areas occupied by personnel.Face, eye, hand, and hearing protection should be worn asnecessary.9. Flow Calculations9.1 The raw air flow rate data must be converted into anequivalent air flow rate at the calibration conditions, pressureand temperature, of the flow meter. In addition this calculatedair flow rate must be corrected to an equivalent natural gas flowrate at standard conditions.9.2 Flow rate conversions shall be performed using the flowrate correct
