PetroFrac app for iPhone and iPad

PetroFrac calculates properties of refinery petroleum fractions based on the D86 distillation and API gravity. You enter the 10%, 50% and 90% D86 distillation temperatures along with the API gravity.

The program calculates:

SG, Specific gravity
Watson K
MW, molecular weight

Once you enter the flow temperature the program calculates:

Density at flow temperature, g/cm3
Viscosity at flow temperature, cSt
Cp, Heat capacity at flow temperature, BTU/(lb Deg F)
H Liquid, Enthalpy of liquid at flow temperature, BTU/Deg F
H Vapor, Enthalpy of vapor at flow temperature, BTU/Deg F
Heat Vap, Heat of vaporization at flow temperature, BTU/Deg F

Any values that are extrapolated beyond the ranges of the correlations are displayed in purple text.

The calculations are based on:

“New correlation for predicting the viscosity of heavy petroleum fractions”
H. M. Moharam, R. A. Al-Mehaideb and M. A. Fahim
Fuel vol. 74, 1995.
I have extended the correlation range using ASTM Designation: D341 – 93 (Reapproved 1998).

“New correlation predicts density of petroleum fractions”
Jose Vicente Gomez, Oil and Gas Journal, July 13, 1992

“Improve Predicted Enthalpy of Fractions”
M. G. Kesler and B. I. Lee
Hydrocarbon Processing 55, No. 3

American Petroleum Institute
Technical Data Book – Petroleum Refining