1、Designation: D2472 00 (Reapproved 2014)D2472 15Standard 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 nu
2、mber in 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 f
3、or use as an electrical insulating gas.NOTE 1This specification is intended to apply only to gas as purchased. However, the test methods referred to in this standard may be useful in theevaluation of in-service or used gas. Test Method D2284 may be particularly helpful since many sulfur hexafluoride
4、 decomposition products are acidic.Test Method D2284 should not be used to evaluate the total amount of sulfur hexafluoride decomposition nor to identify contaminant species. This canonly be done by gas chromatography and similar instrumental techniques.1.2 The values stated in SI units are to be re
5、garded as standard. No other units of measurement are included in this standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and det
6、ermine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D2029 Test Methods for Water Vapor Content of Electrical Insulating Gases by Measurement of Dew PointD2284 Test Method for Acidity of Sulfur HexafluorideD2685 Test Method for Air and Carbon Tetr
7、afluoride in Sulfur Hexafluoride by Gas Chromatography3. Detail Requirements3.1 Sulfur hexafluoride for use as an electrical insulation material shall conform to the requirements prescribed in Table 1.4. Sampling4.1 Withdraw a sample of sulfur hexafluoride from either the vapor space or liquid phase
8、 of the container.4.2 For samples collected from the liquid phase the user must ascertain whether or not the cylinder valve is attached to a diptube. Sample cylinders equipped with a dip tube in an upright position. Invert cylinders not equipped with a dip tube for samplingto ensure that the sample
9、is obtained from the liquid phase of the cylinder.4.3 Analyses may be performed on vapor space samples for routine or preliminary testing. If the vapor phase analysis indicatesthat impurities are not within specification, a liquid phase sample should be obtained and analysed. The liquid phase compri
10、sesmost of the material in the container and is more representative of the overall composition of the SF6 in the container. When adiscrepancy exists between vapor and liquid phase analyses, the liquid phase analysis shall govern, unless otherwise agreed to bypurchaser-seller agreement.5. Precautions
11、5.1 Refer to the section titled Interferences in Test Method D2029.1 This specification is under the jurisdiction of ASTM Committee D27 on Electrical Insulating Liquids and Gasesand is the direct responsibility of Subcommittee D27.02on Gases and Non-Mineral Oil Liquids.Current edition approved Nov.
12、1, 2014Oct. 1, 2015. Published December 2014November 2015. Originally approved in 1966. Last previous edition approved in 20062014as D2472 00(2006).(2014). DOI: 10.1520/D2472-00R14.10.1520/D2472-15.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service a
13、t serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous ver
14、sion. 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 standard as published by ASTM is to be considered the official document.Copyright ASTM Internatio
15、nal, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16. Test Methods6.1 Water Content Test Method D2029.6.2 Hydrolyzable FluoridesDetermine the acidity, expressed as HF, in accordance with Test Method D2284.6.3 AirDetermine the amount of noncondensable gases, expr
16、essed as nitrogen, by gas chromatographic analysis in accordancewith Test Method D2685.6.4 Carbon TetrafluorideDetermine the amount of carbon tetraflluoride by gas chromatographic analysis in accordance withTest Method D2685.6.5 AssayAssay shall be by difference, after impurity content has been dete
17、rmined.7. Keywords7.1 electrical insulating gas; sulfur hexafluorideASTM International takes no position respecting the validity of 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
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22、Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 1 Detail Requirements for Sulfur Hexafluoride ARequirements PropertyWater content, max dew point, C 62 BHydrolyzable fluorides, expressed as HFacidity, max, ppm by weight0.3Hydrolyzable fluorides, expressed as HFacidity, max, mL/kg0.3Air, express
23、ed as N2, max, weight % 0.05Carbon tetrafluoride, max, weight % 0.05Assay, min, weight % 99.8A By agreement between the purchaser and the manufacturer, analysis may berequired and limits established for properties, elements, or compounds notspecified in the table of requirements.B Corresponds to a water content of 8.0 ppm by volume0.0083 mg/L (0.0008 % byvolume) at 1.01325 105 Pa.D2472 152
