Do you know what effect the sediment has on the running characteristics of the pump? Let’s follow the editor of Д245 Water pump for a simple understanding!
The river water contains more sediment, which has a greater impact on the characteristics of the centrifugal pump. Due to hydraulic wear and mechanical wear, the flow rate is reduced, the head is reduced, the efficiency is reduced, and the pump characteristic curve changes corresponding to the increase in power. For the 6Sh -9A water pump, the sand content is different, and the resulting flow, head, and power are also different. The performance curve after the influence of sediment can be seen that the greater the sediment content, the lower the efficiency of the pump, the smaller the flow, the corresponding reduction in head, and the corresponding increase in power. The wear and tear of the water pump by the sediment can be divided into three types: corrosion, cavitation and abrasion. Abrasion is caused by the friction and collision of hard solid particles in the water with the surface of the flow parts, which is a mechanical damage. Because the Yellow River water contains a large amount of sediment, it will cause serious wear on the pump. Generally speaking, the cause of wear is: the erosion force generated by the high-speed sandy water flow. When the sand with a certain particle size and hardness passes through the water pump at high speed, it will generate considerable abrasive force, which will peel off the fine particles on the metal surface layer by layer and cause surface damage. Therefore, high speed is the main cause of wear of the water pump. The high-speed sand-bearing water flow forms vortices and bends on the uneven surface of the metal, and the sand particles form repeated impacts on the surface to destroy the wall.

Due to the impact of the edges and sharp corners of the sand particles, the pressure on the unit area is very large, which exceeds the ultimate strength of the metal surface and is damaged, especially when vortexes are generated and the backflow parts are particularly obvious. For example, the abrasion of the blades, the two sides of the impeller disk, the mouth ring, the pump casing, etc. is mainly caused by the vortex and the backflow impact. Due to the above two effects, the former wears and forms streaks, the latter forms potholes, and the combined effect of the two forms fish scale grooves. Therefore, the wear and tear of silt seriously reduces the service life of the pump.
The above is the introduction of the editor of Д245 Water pump: You can learn more about the impact of sediment on the operation characteristics of the pump.