Multistage pumps are defined as pumps in which the fluid flows through several impellers fitted in series. The balancing of axial thrust can be enhanced by arranging the stages back to back in pairs or groups (see Back-to-back impeller pump). A multistage centrifugal pump is designed with two or more impellers. As part of the pump design, channels within the pump casing work by routing the discharge of one impeller to the suction of another. Water enters the pump and then passes through the multiple impellers in a series, going from the left to right.
A vertical multistage pump is a centrifugal pump containing two or more impellers. The fluid is then directed out the pump casing through a final diffuser and into the pump discharge. Multistage pumps are centrifugal pumps in which the fluid flows through several impellers fitted in series. This is as opposed to a single stage pump which only has one impeller. The more stages the pump has, the higher the final discharge pressure.
A centrifugal pump containing two or more impellers is called a multistage centrifugal pump. The impellers may be mounted on the same shaft or on different shafts. At each stage, the fluid is directed to the center before making its way to the discharge on the outer diameter.
Multistage pumps are common across applications where liquids need to be transported with high pressure, achieving this with the use of multiple impellers or stages in the body of the pump.
Like regular centrifugal pumps, monoblock pumps too circulate water by the conversion of rotational kinetic energy to the hydrodynamic energy of water flow. However, since they have to cover a larger area, these pumps are more efficient and have a higher flow rate.