Simulis suite is a range of software items built on a component-oriented architecture using the Microsoft COM/DCOM middleware. Components can be easily integrated into any application that supports this technology (MS Excel, Matlab, C++, Delphi, Fortra). The thermodynamic package includes over 300 functions to calculate transfer, thermodynamic and equilibrium properties; a large number of proven models; and a standard database of over 1700 pure components. Additional private models and component databases can also be integrated. The suite also provides features such as graphical display of properties, experimental data regression, phase envelope curve plotting and petroleum cut properties estimations. It can be used to fine tune the system’s thermodynamic representation and to perpetuate this expertise with “Property Packages” that include all elements needed for further calculations.