ASTM D2140 Standard Practice for Calculating Carbon-Type Composition of Insulating Oils of Petroleum Origin
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ASTM D2140 Document Information:
Title
Standard Practice for Calculating Carbon-Type Composition of Insulating Oils of Petroleum Origin
ASTM International
Publication Date:
Nov 1, 2008
Scope:
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.
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.
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.
The values stated in SI units are to be regarded as standard. No
other units of measurement are included in this standard.
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.
Keywords:
- carbon type
- composition
- electrical oils
- mineral oils
- oils
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