Hydrates continue as the most important flow assurance problem; an order of magnitude larger than waxes/asphaltenes. The project objectives are to: (1) modify the current pressure drop modeling approach to account for a free water phase, (2) prform flow loop experiments at the University of Tulsa to identify and quantify the key parameters affecting pressure drop, (3) incorporate the pressure drop model with the growth rate model in CSMHyK-fw, (4) validate the improved CSMHyK-fw model by predicting flow loop experiments, (5) model development for water+gas and water+gas+oil (continuous and partially dispersed) systems.