The article deals gives the comparative analysis of the structure of the mixed-currents in the various modifications to the equipment to improve efficiency desalting, to determine the rational design parameters to ensure efficient mixing and dispersion of the washing water and oil. Calculated hydrodynamic characteristics and constructive parameter, characterizing the twist, for each sample unit. With the help of computer modeling determined concentration of water in the mixture, pressure and turbulent energy in these devices. The analysis of the results.