1、Designation: D2472 00 (Reapproved 2014)Standard 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
2、parentheses indicates the 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
3、 an electrical insulating gas.NOTE 1This 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 decomposit
4、ionproducts are acidic. Test Method 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 This standard does not purport to address all of thes
5、afety 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 prior to use.2. Referenced Documents2.1 ASTM Standards:2D2029 Test Methods for Water
6、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 Chromatography3. Detail Requirements3.1 Sulfur hexafluoride for use as an electrical insulationma
7、terial 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 liquid phase the usermust ascertain whether or not the cylinder valve is attached toa d
8、ip 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 may be performed on vapor space samples forroutine or preliminary testing. If th
9、e 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 of the overall composition of the SF6in thecontainer. When a discrepancy exist
10、s 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 Methods6.1 Water Content Test Method D2029.6.2 Hydrolyzable FluoridesDeter
11、mine 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 TetrafluorideDetermine the amount of carbontetraflluoride by gas chromato
12、graphic 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 jurisdiction of ASTM Committee D27 onElectrical Insulating Liquids and G
13、asesand is the direct responsibility of Subcom-mittee D27.02 on Gases and Non-Mineral Oil Liquids.Current edition approved Nov. 1, 2014. Published December 2014. Originallyapproved in 1966. Last previous edition approved in 2006 as D2472 00(2006).DOI: 10.1520/D2472-00R14.2For referenced ASTM standar
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20、600; http:/ 1 Detail Requirements for Sulfur HexafluorideARequirements PropertyWater content, max dew point, C 62BHydrolyzable fluorides, expressed as HFacidity, max, ppm by weight0.3Air, expressed as N2, max, weight % 0.05Carbon tetrafluoride, max, weight % 0.05Assay, min, weight % 99.8ABy agreement between the purchaser and the manufacturer, analysis may berequired and limits established for properties, elements, or compounds notspecified in the table of requirements.BCorresponds to a water content of 8.0 ppm by volume at 1.01325 105Pa.D2472 00 (2014)2
