Three phase, hydrate-liquid water-vapor (H-Lw-V) equilibrium conditions for the CH4 + CO2 + H2O system have been predicted. The modelling is based on the Trebble-Bishnoi equation of state along with the models by van der Waals and Platteeuw and Holder. The predictions are demonstrated for the temperature region between 274 and 280 K and the pressure region between 1.4 and 5 MPa. The predicted vapor mole fraction of carbon dioxide has an AARE of 10.2% and the predicted solubilities for methane and carbon dioxide in the liquid phase have an AARE of 9.0% and 3.2%, respectively. This is the first study to predict the solubility of methane and carbon dioxide in the liquid phase for the CH4 + CO2 + H2O system under H-Lw-V equilibrium. (C) 2011 Elsevier B.V. All rights reserved.