This article demonstrates how the starting emulsion viscosity can be used to calculate hydraulic resistance. The emulsions for the experiments were prepared by saturating the liquid in an apparatus with a stirrer by a gas or a second liquid (water) acting as the disperse phase. The hydraulic resistance in emulsion flow through straight tubes was determined by measuring the pressure differential in a 1-m-long tube section in a circulation type apparatus by using tubes of different diameters. Water-in-oil type emulsion is formed in oil exploitation and desalination processes as well as in polymer synthesis when the polymer and its solution is washed off the catalyst residues with water. It is determined that in calculating the hydraulic resistance it is proper to use the starting emulsion viscosity since the end value under real conditions will be unknown because it depends on the initial state of dispersion of the water drops and the packing parameters which determine the packing capacity from drop enlargements.