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An equation of state (EOS) software module was developed for CH₄, CO₂, and CH₄-CO₂ mixed hydrates by using VanderWall-Platteeuw model. The model is based on classical thermodynamics and is used to predict the thermodynamic behavior of gas hydrates including pressure and temperature at which gas hydrates form. A numerical scheme was developed for solving Lw-V-H and I-V-H equilibrium conditions for bulk hydrate formation from pure water and gas. The model was further extended to determine hydrate equilibrium conditions in the presence of salt. The results calculated from the model were in close agreement with the experimental data reported in literature. One of the contributions of this work is that the proposed model can predict hydrate dissociation pressures at temperatures above 285 K more accurately than any of the existing available modules. The new EOS has been implemented in …