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Specification of gravity losses in multi-phase relief pipelines

The paper reviews specific characteristics of calculation of gravity losses on passage of reference planes in the relief pipelines in the multi-phase flows. It was defined that alongside with geodesic heights of beginning and end of the pipelines, the pressure gravity losses will depend on the coordinates of gravity zones (reference marks of beginning and end of multi-phase free-flow zones). The method for definition of pressure-free zones in the multi-phase flows is presented.