Abstract: Motor driven inducer equipped centrifugal pumps have the inducer and centrifugal pump impellers mounted on a motor shaft on opposite ends of the motor so that the inducer will not create prerotation in the impeller entrance permitting both the inducer and the impeller to operate independently and produce a head which is the sum of the two individual heads produced by the inducer and the impeller. The heretofore required relationship between the inducer outer diameter and the impeller inner diameter is eliminated and inducer sizes may be varied for best efficiency. Pumpage is vented to the motor through a hollow motor shaft to cool the motor and lubricate the bearings. Multi-staging of the pump is simplified with standard parts being stacked to produce the desired number of stages and, in the multi-stage embodiment, the second stage impeller is subjected to an upward thrust by the pumpage from the first stage to balance inducer thrust loads on the bearings with opposite impeller thrust loads.