Horizontal multistage centrifugal pump consists of two or more impellers on the same shaft. Each stage consists of an impeller and ring section casing. Dynamically balanced impellers are provided with replaceable wear ring to maintain optimum clearance for better efficiency. The balancing of axial thrust can be enhanced by arranging the stages back to back in pairs or groups. Pump shaft is supported with bush bearing on each casing to withstand maximum radial thrust. Between bearing design provides hydraulic balance, hence eliminating axial thrust.