1、Designation: D 2472 00 (Reapproved 2006)Standard Specification forSulfur Hexafluoride1This standard is issued under the fixed designation D 2472; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number i
2、n parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This specification applies to sulfur hexafluoride for useas a
3、n electrical insulating gas.NOTE 1This specification is intended to apply only to gas as pur-chased. However, the test methods referred to in this standard may beuseful in the evaluation of in-service or used gas. Test Method D 2284may be particularly helpful since many sulfur hexafluoride decomposi
4、tionproducts are acidic. Test Method D 2284 should not be used to evaluatethe total amount of sulfur hexafluoride decomposition nor to identifycontaminant 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:2D 2029 Test Methods for Water
6、 Vapor Content of ElectricalInsulating Gases by Measurement of Dew PointD 2284 Test Method for Acidity of Sulfur HexafluorideD 2685 Test Method for Air and Carbon Tetrafluoride inSulfur Hexafluoride by Gas Chromatography3. Detail Requirements3.1 Sulfur hexafluoride for use as an electrical insulatio
7、nmaterial 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 to
8、a 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 may be performed on vapor space samples forroutine or preliminary testing. If
9、 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 of the overall composition of the SF6in thecontainer. When a discrepancy ex
10、ists 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 MethodD 2029.6. Test Methods6.1 Water ContentTest Method D 2029.6.2 Hydrolyzable FluoridesD
11、etermine the acidity, ex-pressed as HF, in accordance with Test Method D 2284.6.3 AirDetermine the amount of noncondensable gases,expressed as nitrogen, by gas chromatographic analysis inaccordance with Test Method D 2685.6.4 Carbon TetrafluorideDetermine the amount of carbontetraflluoride by gas ch
12、romatographic analysis in accordancewith Test Method D 2685.1This specification is under the jurisdiction of ASTM Committee D27 onElectrical Insulating Liquids and Gases and is the direct responsibility of Subcom-mittee D27.02 on Gases and Synthetic Liquids.Current edition approved April 1, 2006. Pu
13、blished April 2006. Originallyapproved in 1966. Last previous edition approved in 2000 as D 2472 00.2For 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 Do
14、cument Summary page onthe ASTM website.TABLE 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 % 0.05Assa
15、y, 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 3 105Pa.1Copyright ASTM Inter
16、national, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.5 AssayAssay shall be by difference, after impuritycontent has been determined.7. Keywords7.1 electrical insulating gas; sulfur hexafluorideASTM International takes no position respecting the validity of
17、any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to r
18、evision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Yo
19、ur comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is cop
20、yrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D 2472 00 (2006)2
