CI is defined in terms of Mean Average Boiling Point (Tb) and specific gravity (SG) at 60☏ as shown in Equation 10:Īccording to this CI scale, all n-paraffins have a CI value of 0, while cyclohexane (the simplest naphthene), has a CI value of 50, and benzene has a CI value of 100. Bureau of Mines Correlation Index (BMCI) or (CI) is useful for characterization of crude oil fractions. VGC varies between 0.74 to 0.75 for paraffinic, 0.89 and 0,94 for naphthenic, and 0.95 and 1.13 for aromatic hydrocarbons. Where V(100☏) is the viscosity in SUS and SG is the specific gravity at 15.6☌ (60☏). According to a standard method (ASTM D2501), VGC can be calculated at a reference temperature of 100☏ as follows in Equation 9: This parameter depends on viscosity expressed in Saybolt Universal Seconds (SUS) and specific gravity. Semih Eser © Penn State is licensed under CC BY-NC-SA 4.0Īnother parameter defined in the early years of petroleum characterization is the viscosity gravity constant (VGC).
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