Reasons For The Decrease in Operating Efficiency Of Submersible Pumps

Dec 11, 2024

It is inevitable that the operating efficiency of a hot water submersible pump will decrease after prolonged use. What we can do is to identify the possible causes of this phenomenon, avoid these problems during use, and extend the service life of the pump to maximize product efficiency.

1. Due to the erosion of water flow, the inner wall of the flow channel and the impeller water surface of the hot water submersible pump become rough and uneven, and the friction coefficient of the flow channel in the hot water submersible pump increases. In addition, the flow velocity of water in the pump is high, and the head loss increases. Hydraulic efficiency decreases.

2. 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 hot water submersible pump can reduce the pump body volume, decrease the pumping volume, and make the flow channel rough, resulting in increased head loss. Both passenger flow efficiency and hydraulic efficiency have decreased.

3. Due to defects, cavitation, abrasion, corrosion, and chemical erosion caused by processing technology, cavities or cracks are formed in the pump flow channel, and energy loss is caused by vortices generated during water flow. Hydraulic efficiency decreases.

4. Cavitation on on the surface of the impeller. Due to the negative pressure generated during the operation of the blade's back water surface, when the pressure PkPk ≤ Pva, air pockets and honeycomb surfaces are formed, which cause cavitation of the pump blades under the action of electrochemical corrosion.

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.

Hot water submersible pumps should be observed regularly during operation in order to detect these faults early and handle them promptly. Early processing will not cause significant losses to the company.