Abstract: A pump casing made of sheet metal comprises a casing jacket having a cylindrical cup shape, an end plate formed at one side of the casing jacket, a casing flange formed at the other side of the casing jacket and a projecting portion radially outwardly bulged so as to have a volute shape. The end plate is axially outwardly bulged so as to have an arcuately curved surface, and the base portion of the projecting portion is located on the extension of the arcuately curved surface of the end plate so as to provide continuity from the end plate to the projecting portion. With the above structure, there is no portion where a great deal of bending stress caused by stress concentration is generated, and the pump casing has a sufficient strength and rigidity against not only piping forces but also internal pressure.

Abstract: The subject of the invention is a casing jacket for centrifugal pumps in which the suction side connecting flange is integrated in the casing jacket and the actual suction nozzle is located inside the casing jacket. A high degree of pressure resistance is obtained by embossed, corrugation-like spaces for the suction side flange connecting means and a corresponding curved or spherical outer contour of the casing jacket.