In the design and operation stages of multiphase pipelines, prediction of flow temperatures and pressure variations is important. Dynamic evaluation of process changes in real-time and calculation of thermodynamic properties of multi-component mixtures is challenging. In this paper a mechanism to counter phase change losses due incorporating real-time dynamics is presented. A case-study for a major oil and gas distribution company with real-world deployment and observation has been included. The model provides notification of changes and displays a PT-phase diagram using different gas compositions and oil assay data to compare the phase changes in model and commercial pipelines in real-time. With density and viscosity considerations in the approach, gas condensation alarms are raised dynamically depending on the total vapor fraction in the mixture.

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