petroleum fraction viscosity

[vszzz]

can anybody suggest a good correlation for petroleum fraction viscosities as a function of API, K, etc.
many graphical solutions are available, but i am looking for a reliable equation that could be fed into a program.
vishal

 

[TD2K]

Have you looked in the API technical data books?

 

[jmw]

ASTM 2502 is the standadr for molecular weight Vs viscosity and there is amnother standard for viscosity gravity gradients that may be useful. (I will come back with a number tommorow.

 

[vszzz]

Thanks, TD2K and jmw.
I did get some useful correlations in API data book. will check ASTM 2502 as well.