1、Designation: D3283 98 (Reapproved 2012)Standard Specification forAir as an Electrical Insulating Material1This standard is issued under the fixed designation D3283; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last r
2、evision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification applies to air used as an electricalinsulating material in electrical equipment.1.2 This standard does no
3、t 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 prior to use.2. Referenced Documents2.1 ASTM Standard
4、s:2D2029 Test Methods for Water Vapor Content of ElectricalInsulating Gases by Measurement of Dew PointE105 Practice for Probability Sampling of MaterialsE260 Practice for Packed Column Gas Chromatography2.2 Other Documents:Specification G-7.1 Commodity Specification for Air33. Classification3.1 Thi
5、s specification shall apply to Type I, gaseous air.4. Manufacture4.1 This specification applies to both atmospheric air and toair synthesized by blending oxygen and nitrogen in properproportions.5. Composition and Properties5.1 The material shall conform to the chemical requirementsspecified in Tabl
6、e 1.6. Sampling6.1 Gaseous Air in High Pressure Metal ContainersExtract samples from the container or containers with anappropriate pressure reducing regulator. Screw the pressureregulator inlet connection on to the container valve outlet.Connect the regulator outlet connection to the gas samplingpi
7、pe or to the gas analyzing equipment by means of metal orglass tubing except that rubber tubing may be used to securebutt joints in metal-to-glass or glass-to-glass tubing. Take careto ensure that all tubing is clean and dry and the samplingapparatus is thoroughly purged of atmospheric air before th
8、esample is taken. Where a multiplicity of containers are to besampled, follow Practice E105 if it is considered satisfactory tosample less than the total number of containers.7. Test Methods7.1 The components enumerated in this specification shallbe determined in accordance with the following:7.1.1
9、Carbon Monoxide and Carbon Dioxide PracticeE260.7.1.2 OxygenPractice E260.7.1.3 Dew PointTest Methods D2029.8. Shipping8.1 Air for shipment shall be packaged in metal containersthat comply with the requirements of and be approved by theInterstate Commerce Commission. The inside of the cylindersshall
10、 be dry and free from oil and corrosive chemicals.9. Keywords9.1 dielectric; dielectric air; dielectric gas; electrical insu-lating gas; gaseous air; insulating air1This specification is under the jurisdiction of ASTM Committee D27 onElectrical Insulating Liquids and Gasesand is the direct responsib
11、ility of Subcom-mittee D27.02 on Gases and Non-Mineral Oil Liquids.Current edition approved May 1, 2012. Published May 2012. Originallyapproved in 1973. Last previous edition approved in 2004 as D3283 98(2004).DOI: 10.1520/D3283-98R12.2For referenced ASTM standards, visit the ASTM website, www.astm.
12、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.3Available from the Compressed Gas Assn., Inc., 500 Fifth Ave., New York, NY10036.Copyright ASTM International, 100 Barr Harbo
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18、).TABLE 1 Composition and Properties for AirAType IOxygen, volume % 19.5 to 23.5Carbon monoxide, max, volume % 0.0020Carbon dioxide, max, volume % 0.10Nitrogen predominantly balanceDew point, max, C 58ABy agreement between purchaser and manufacturer, analysis may be requiredand limits established for elements or compounds not specified in the table ofchemical composition.D3283 98 (Reapproved 2012)2
