Abstract: This work is the next one from undertaken by the authors series of investigation of leak free pumps strength and goes on the subject matter, started in the paper "Pressure vessel Strength analysis as conjugation of cylindrical of cylindrical and spherical", new calculation technique of the most stressed element of the pump power unit-spherical bottom, conjugated with the rigid and an suction branch pipe is offered in the paper. The technique novelty consits in the use of complex presentation of inner efforts, growing in the pump case at its action.