The efficiency of the centrifugal pump is the product of the three kinds of efficiency of mechanical, volume and hydraulic. The efficiency of the pump unit is the product of the efficiency of the pump and the efficiency of the motor. The main factors that cause the low efficiency of the centrifugal pump group are the following eight:

The efficiency of the 1. pump itself is the most fundamental. The efficiency of the pump in the same working condition may be more than 15%.

2. the operation condition of the centrifugal pump is lower than the rated condition of the pump, the pump efficiency is low and the energy consumption is high.

The efficiency of the 3. motor is basically unchanged in the use of the motor. Therefore, it is important to select a high efficiency motor.

4. the effect of mechanical efficiency is mainly related to the quality of design and manufacturing. After the pump is selected, the later management has less influence.

5. hydraulic loss includes hydraulic friction and local resistance loss. After the pump is running for a certain time, the surface of the impeller and the guide blade is inevitably worn, the hydraulic loss is increased and the hydraulic efficiency is reduced.

The volume loss of the 6. pump is also known as leakage loss, including three kinds of leakage losses, including the impeller seal ring, the interstage and the axial force balance mechanism. The volume efficiency is not only related to the design and manufacture, but also is related to the later management. After the pump has been running for a certain period of time, the volume efficiency is reduced because of the friction between the components and the increase of the gap.

7. the centrifugal pump is evacuated and empty because of the blockage of the filter cylinder and the intake of the pipeline.

Before the 8. pump starts, the employees do not pay attention to the preparatory work before the centrifugal pump starts, and the basic operation rules such as warm pump, disc pump and perfusion pump are not thoroughly executed, which often cause cavitation phenomenon of the pump, resulting in large pump noise, large vibration and low pump efficiency.

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