ASTM-D2501 › Historical Revision Information
Standard Test Method for Calculation of Viscosity-Gravity Constant (VGC) of Petroleum Oils
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Scope
1.1 This test method covers the calculation of the viscosity-gravity constant (VGC) of petroleum oils having viscosities in excess of 4 cSt. = 4 X 10-6 m-2/s at 40°C (104°F).
1.2 Annex
1.3 This standard does not purport to address all of the safety problems, 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.>
1.4 The values stated in either acceptable SI units or in other units shall be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system must be used independently of the other, without combining values in any way.
Significance and Use
The viscosity-gravity constant (VGC) is a useful function for the approximate characterization of the viscous fractions of petroleum.2 It is relatively insensitive to molecular weight and is related to a fluids composition as expressed in terms of certain structural elements. Values of VGC near 0.800 indicate samples of paraffinic character, while values close to 1.00 indicate a preponderance of aromatic structures. Like other indicators of hydrocarbon composition, the VGC should not be indiscriminately applied to residual oils, asphaltic materials, or samples containing appreciable quantities of nonhydrocarbons.
Keywords
aromatic; density; kinematic viscosity; paraffinic; ICS Number Code 75.080 (Petroleum products in general)
To find similar documents by ASTM Volume:
05.01 (Petroleum Products and Lubricants (I): D56 - D3710)
To find similar documents by classification:
75.080 (Petroleum products in general)
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Document Number
ASTM-D2501-91(2005)
Revision Level
1991 R05 EDITION
Status
Superseded
Modification Type
Reapproval
Publication Date
Nov. 1, 2005
Document Type
Test Method
Page Count
3 pages
Committee Number
D02.04.0K