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# How to Measure the Efficiency of a Centrifugal Pump?

Posted: 07/12/2020
Category: centrifugal Pumps

When we speak about any machine’s efficiency, we refer to how well it can convert one form of energy into another. To give an example, let’s assume that we supply one unit of energy to a machine. If the output is one unit of energy in the same measure, its efficiency is 100 percent. On the other hand, if the output is just half-a-unit of energy, then the machine’s efficiency is considered 50 percent. In the pump industry, much of the work is carried by two major components: The AC induction motor converts electrical energy into mechanical energy. The centrifugal pump converts mechanical energy into hydraulic energy. Coming to centrifugal pumps, the efficiency refers to how effectively the pump can convert one form of energy (mechanical energy) going into the pump into another form of energy (hydraulic energy) coming out of the pump. In simple terms, it can be defined as the difference in horsepower going into the pump and coming out of it. The overall efficiency of a centrifugal pump can be calculated using the formula:

Ef = Pw/Ps

Ef – refers to the efficiency of the centrifugal pump. Pw – refers to water power. Ps – refers to the shaft power. If pumps were to operate in an ideal environment, then the water power exiting the pump should be equal to the shaft power entering the pump, thereby producing 100% efficiency. Unfortunately, it’s not practically possible to operate pumps in an ideal environment. Due to friction, energy losses, and leakage, the pump’s shaft power is always higher than the water power exiting the pump.

### Why worry about Pump Efficiency?

The pump efficiency plays a crucial factor in helping you choose the right pump for the job. A pump that isn’t efficient cannot handle the job at hand. Also, comparing the pump’s previous efficiencies to the current efficiency will help you understand if your pump is facing any troubles.

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