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ASTM D2140-97

Historical Revision

Standard Practice for Calculating Carbon-Type Composition of Insulating Oils of Petroleum Origin

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1.1 This test method may be used to determine the carbon-type composition of mineral insulating oils by correlation with basic physical properties. For routine analytical purposes it eliminates the necessity for complex fractional separation and purification procedures. The test method is applicable to oils having average molecular weights from 200 to above 600, and 0 to 50 aromatic carbon atoms.

1.2 Carbon-type composition is expressed as percentage of aromatic carbons, percentage of naphthenic carbons, and percentage of paraffinic carbons. These values can be obtained from the correlation chart, Fig. 1, if both the viscosity-gravity constant (VGC) and refractivity intercept (r) of the oil are known. Viscosity, density and specific gravity, and refractive index are the only experimental data required for use of this test method.

1.3 This test method is useful for determining the carbon-type composition of electrical insulating oils of the types commonly used in electric power transformers and transmission cables. It is primarily intended for use with new oils, either inhibited or uninhibited.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


SDO ASTM: ASTM International
Document Number D2140
Publication Date April 10, 1997
Language en - English
Page Count 6
Revision Level 97
Supercedes
Committee D27.07
Publish Date Document Id Type View
May 1, 2024 D2140-24 Revision
Dec. 1, 2023 D2140-23E01 Revision
Dec. 1, 2023 D2140-23 Revision
Nov. 1, 2008 D2140-08 Revision
March 10, 2003 D2140-03 Revision
April 10, 1997 D2140-97 Revision
Jan. 1, 2017 D2140-08R17 Reaffirmation