Reasons For Efficiency Decline Of Horizontal Multi-stage Centrifugal Pump

Dec 04, 2024

1. Due to the addition of medication or water quality before the pump, severe scaling or corrosion may occur inside the pump casing. Severe scale accumulation inside the pump casing can increase the wall thickness by about 2ram, and the formation of scale nodules on the inner wall of the horizontal multi-stage centrifugal pump can reduce the pump body volume, decrease the pumping volume, rough the flow channel, increase the head loss, and lower the passenger volume efficiency and hydraulic efficiency.

2. The erosion of water flow causes the inner wall of the horizontal multi-stage centrifugal pump flow channel and the water surface of the impeller to become rough and uneven. The friction coefficient of the flow channel in the horizontal multi-stage centrifugal pump increases, and coupled with the high flow velocity of water in the pump, the head loss increases and the hydraulic efficiency decreases.
3. Cavitation on on the surface of the impeller. Due to the negative pressure generated during the operation of the water surface behind the blades, cavitation occurs in the pump blades under the action of electrochemical corrosion, resulting in the formation of air pockets and honeycomb surfaces.
4. The casting defects, cavitation, abrasion, corrosion, and chemical erosion caused by the processing technology of horizontal multi-stage centrifugal pumps result in the formation of voids or cracks in the pump flow channel, and the generation of vortices during water flow causes energy loss and a decrease in hydraulic efficiency.
5. Volume loss and mechanical loss. Due to the prolonged use of the pump, mechanical wear leads to leakage and increased resistance, resulting in a decrease in volumetric efficiency and mechanical efficiency.

The above reasons have led to a deterioration in the performance of horizontal multi-stage centrifugal pumps. The operational efficiency is reduced, and in severe cases, the efficiency of horizontal multi-stage centrifugal pumps can be reduced by more than 10%.