1、Designation:D247215Standard Specification forSulfur Hexafluoride1This standard is issued under the fixed designation D2472;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 parentheses indicates th
2、e year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This specification applies to sulfur hexafluoride for useas an electrical insulating gas
3、.NOTE1This specification is intended to apply only to gas aspurchased.However,the test methods referred to in this standard may beuseful in the evaluation of in-service or used gas.Test Method D2284 maybe particularly helpful since many sulfur hexafluoride decompositionproducts are acidic.Test Metho
4、d D2284 should not be used to evaluate thetotal amount of sulfur hexafluoride decomposition nor to identify con-taminant species.This can only be done by gas chromatography andsimilar instrumental techniques.1.2 The values stated in SI units are to be regarded asstandard.No other units of measuremen
5、t are included in thisstandard.1.3 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 appro-priate safety and health practices and determine the applica-bility of regulatory limitations
6、prior to use.2.Referenced Documents2.1 ASTM Standards:2D2029 Test Methods for Water Vapor Content of ElectricalInsulating Gases by Measurement of Dew PointD2284 Test Method for Acidity of Sulfur HexafluorideD2685 Test Method for Air and Carbon Tetrafluoride inSulfur Hexafluoride by Gas Chromatograph
7、y3.Detail Requirements3.1 Sulfur hexafluoride for use as an electrical insulationmaterial shall conform to the requirements prescribed in Table1.4.Sampling4.1 Withdraw a sample of sulfur hexafluoride from eitherthe vapor space or liquid phase of the container.4.2 For samples collected from the liqui
8、d phase the usermust ascertain whether or not the cylinder valve is attached toa dip tube.Sample cylinders equipped with a dip tube in anupright position.Invert cylinders not equipped with a dip tubefor sampling to ensure that the sample is obtained from theliquid phase of the cylinder.4.3 Analyses
9、may be performed on vapor space samples forroutine or preliminary testing.If the vapor phase analysisindicates that impurities are not within specification,a liquidphase sample should be obtained and analysed.The liquidphase comprises most of the material in the container and ismore representative o
10、f the overall composition of the SF6in thecontainer.When a discrepancy exists between vapor and liquidphase analyses,the liquid phase analysis shall govern,unlessotherwise agreed to by purchaser-seller agreement.5.Precautions5.1 Refer to the section titled Interferences in Test MethodD2029.6.Test Me
11、thods6.1 Water Content Test Method D2029.6.2 Hydrolyzable FluoridesDetermine the acidity,ex-pressed as HF,in accordance with Test Method D2284.6.3 AirDetermine the amount of noncondensable gases,expressed as nitrogen,by gas chromatographic analysis inaccordance with Test Method D2685.6.4 Carbon Tetr
12、afluorideDetermine the amount of carbontetraflluoride by gas chromatographic analysis in accordancewith Test Method D2685.6.5 AssayAssay shall be by difference,after impuritycontent has been determined.7.Keywords7.1 electrical insulating gas;sulfur hexafluoride1This specification is under the jurisd
13、iction of ASTM Committee D27 onElectrical Insulating Liquids and Gasesand is the direct responsibility of Subcom-mittee D27.02 on Gases and Non-Mineral Oil Liquids.Current edition approved Oct.1,2015.Published November 2015.Originallyapproved in 1966.Last previous edition approved in 2014 as D2472 0
14、0(2014).DOI:10.1520/D2472-15.2For 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.Copyright ASTM International,100 Barr
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