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ASTM International - ASTM D2140-08

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

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Organization: ASTM International
Publication Date: 1 November 2008
Status: inactive
Page Count: 3
ICS Code (Insulating oils): 29.040.10
significance And Use:

The primary purpose of this practice is to characterize the carbon-type composition of an oil. It is also applicable in observing the effect on oil constitution, of various refining processes such... View More

scope:

1.1 This practice 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 practice 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 (ri) of the oil are known. Viscosity, density and relative density (specific gravity), and refractive index are the only experimental data required for use of this test method.

1.3 This practice 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 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.5 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.


FIG. 1 Correlation Chart for Determining % CA, % CN, and % CP

Document History

January 1, 2017
Standard Practice for Calculating Carbon-Type Composition of Insulating Oils of Petroleum Origin
1.1 This practice 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...
ASTM D2140-08
November 1, 2008
Standard Practice for Calculating Carbon-Type Composition of Insulating Oils of Petroleum Origin
1.1 This practice 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...
March 10, 2003
Standard Test Method for Carbon-Type Composition of Insulating Oils of Petroleum Origin
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...
April 10, 1997
Standard Test Method for Carbon-Type Composition of Insulating Oils of Petroleum Origin
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...
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