A multiple-stage pump is an impeller-driven pump in which fluid flows through multiple impellers connected in series. A back-to-back arrangement of the stages will enhance axial thrust balance (see Back-to-back impeller pump). Two or more impellers make up a multistage centrifugal pump. Pumps work by routing one impeller’s discharge to another’s suction through channels within the casing. After entering the pump, water passes through a series of impellers going from left to right.
Vertical Multiple-stage pumps have more than one impeller and are centrifugal pumps. After the fluid is directed out of the pump casing, it passes through a diffuser to reach the pump discharge. A multiple-stage pump is a centrifugal pump consisting of a series of impellers that move fluid through them. Contrary to a single-stage pump with only one impeller, this pump has three impellers. Higher discharge pressure results from having more stages in the pump.
It is called a multistage centrifugal pump if it contains two or more impellers. It is possible to mount the impellers on the same shaft or on different shafts. At each stage, the fluid is directed toward the center before making its way to the outer diameter, where it is discharged.
The use of multiple stages in the body of a pump allows liquids to be transported under high pressure, and multistage pumps are common across applications requiring high pressure transportation of liquids.
A monoblock pump circulates water similarly to centrifugal pumps by converting rotational kinetic energy to hydrodynamic energy. However, since they have to cover a larger area, these pumps are more efficient and have a greater flow rate.
When are multi-stage pumps necessary? Multi-stage pumps can be used for a wide variety of applications, including providing water to high-rise buildings, reverse osmosis (RO), boiler feed water, cleaning high pressure, water works, heating, condensate, oil and gas production, power generation, and mining.