Patent ID: 6655221
Filing Date: 2003-12-02
Classification: G01F,G01N

Abstract:
A method for determining cross-section fractions, as a basis for flow rate determination, for individual phases in a flow of a multiphase mixture at a location in a pipe, velocities of gas and liquid phases respectively in the flow being determined by cross-correlating measurements of one of parameters permittivity and conductivity of the mixture, executed at a specific position at said relevant location and upstream or downstream thereof, the measurements of said one parameter also providing direct information related to the cross-section phase fractions, and a narrowed flow passage being provided for measuring differential pressure between a first position upstream or downstream of said narrowed passage and a second position at said passage, said passage having a known cross-section area, comprising the steps of:arranging said narrowed passage so as to extend some distance along the pipe to each side of said specific position, measuring said one parameter by means of electrodes arranged in said narrowed flow passage, and calculating the final cross-section fractions for the phases from the differential pressure, from values known beforehand regarding the mass densities of the phases, from the respective gas and liquid phase velocities, from said one parameter and from said cross-section area.