L51611 State-of-the-Art Methods for Multiphase Flow Pipelines

This report concisely documents the state-of-the-art in two-phase flow methods to the design of pipelines for the gas and oil industry. The report is written in a manner suitable for use by analysts who want to develop computerized methods to perform the multiphase calculations. The approach used in the methods described here provides a general structure for the multiphase flow methods to be used in pipeline design. The underlying theories for the determination of the flow regime and the calculation of pressure drop and holdup are mechanistic. The fundamentals of the underlying theory permit scaling of the predictions to pipe sizes or gas densities (pressure) where data are lacking.