Influence of Sediment on the Operating Characteristics of Water Pump
2021-11-01
The impact of sediment on the operation characteristics of water pumps. The Yellow River water contains a large amount of sediment, which significantly affects the characteristics of centrifugal pumps. Hydraulic and mechanical wear reduce flow rate, head, and efficiency, while increasing power. The pump's characteristic curve also changes accordingly. For a 6Sh-9A water pump, different sediment concentrations result in different flow rates, heads, and power outputs. The performance curve after sediment impact shows that higher sediment content leads to lower pump efficiency, reduced flow rate, decreased head, and increased power. Sediment-induced wear on water pumps. Damage to the water-passing parts of the pump can be categorized into corrosion, cavitation, and abrasion. Abrasion, a form of mechanical damage, is caused by the friction and impact of hard solid particles in the water against the surface of the flow components. The high sediment content in the Yellow River water causes significant wear on water pumps. Generally, the main cause of wear is the erosive force of high-speed sediment-laden water flow. When sediment particles of a certain size and hardness pass through the pump at high speed, they generate considerable abrasive force, peeling away fine particles from the metal surface layer by layer, causing surface damage. Therefore, high speed is the primary cause of pump wear. High-speed sediment-laden water flow creates vortices and bends on uneven metal surfaces, and repeated impacts from sand particles damage the surface.
Impact of Sediment on Pump Operation Characteristics The Yellow River water contains more sediment, which has a greater impact on the characteristics of the centrifugal pump. Due to hydraulic and mechanical wear, the flow rate is reduced, the head is reduced, the efficiency is reduced, and the power of the corresponding pump is increased. The characteristic curve changes are also different. 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 sedimentation shows that the greater the sediment content, the lower the efficiency of the pump, the smaller the flow rate, 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.
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