Multi-stage pump in-line (tandem) versus opposed impeller arrangements

inline-impellers

Common to early twentieth century multi-stage rotodynamic (centrifugal) pumps were design features for minimizing axial thrust.  At that time the thrust bearings available had limited load carrying capability.  Design solutions evolved in two principal directions. One design approach was to hydraulically balance the thrust for each stage or for the entire series of in-line (tandem) […]