Page 91 - Characterization and Properties of Petroleum Fractions - M.R. Riazi

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2. CHARACTERIZATION AND PROPERTIES OF PURE HYDROCARBONS 71

Kinematic Viscosity at 100 F , Centistokes August 16, 2007 16:6 API Gravity Watson Characterization Factor, K

Kinematic Viscosity at 210 F , Centistokes

FIG. 2.12—Prediction of kinematic viscosity from K W and the API gravity. With
permission from Ref. [2].

at least in the same range of errors for the prediction of viscos- from Fig. 2.12 or Eq. (2.130) should be taken with caution.
ity from Eqs. (2.128) and (2.129). Similarly constants A 1 and An application of this method to estimate kinematic viscosity
B 1 in Eq. (2.130) can be determined when values of viscosity of petroleum fractions is demonstrated in Chapter 3. Further
at two temperatures other than 100 and 210 F are known. discussion on the estimation of viscosity is given in Chapter 8.
◦
When ν T is being calculated from Eq. (2.130) at temperature
T, a trial and error procedure is required to determine param- Consistency Text—One way to check reliability of a predicted
eter c T . The first estimate is calculated by assuming ν T > 1.5 physical property is to perform a consistency test through
cSt and thus c T = 0. If calculated value is less than 1.5 cSt, different procedures. For example, laboratory reports may
then c T is calculated from Eq. (2.131). Extrapolated values consist of viscosity data at a temperature other than 38 or

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