Abstract: Vane type positive displacement pump includes three separate vane type pump units on a single shaft, with spacers between the middle pump unit and both end pump units for axially positioning the pump vanes for the middle pump unit at both ends and axially positioning the pump vanes for the two end pump units at one end. The shaft has reduced diameter journal portions adjacent opposite ends of the barrel portion for the middle pump unit on which the spacers are mounted. Also, the outer diameter of the barrel portions for the two end pump units corresponds to the outer diameter of the journal portions for the spacers. At the other end of the end pump units are end bearings for axially positioning the vanes for the end pump units at such other ends.

Abstract: The centrifugal pump comprises a unique combination of a centrifugal impeller, inducer and jet pump having the capability of handling incoming fluids with a minimum V/L ratio of 1.0. The motive flow for the jet nozzle is provided by high pressure fluid discharge from the centrifugal impeller, and the high velocity jet is used both to create the suction and entrainment of the fluid coming from the suction inlet and to break up the large incoming vapor bubbles.