The working principle of the multistage centrifugal pump is a centrifugal force generated by rotating impeller, impeller channel effect in the water under the centrifugal force thrown outwards into the pump shell and the impeller center pressure decreases, water wells in the water inlet pipe pressure mean impeller, thus continuously water supply water, spiral pump shell to complete the kinetic energy of water thrown from the impeller into pressure energy, most smoothly to water supply pipeline tasks.

During operation of the pump, the impeller drives the rotation of the liquid in the pump, the impeller and the outer surface of liquid and liquid and the pump shell, the internal motion of the liquid are friction loss, and fluid movement of the vortex loss and shock losses, the pump body fluid flow due to overcome space resistance consume volume loss etc.. Because of the various losses in the pump, the effective power obtained by water is always less than the axial power. Only by reducing the loss in the pump as much as possible can the operation efficiency of the pump be improved.

In the three losses of horizontal multistage centrifugal pumps, the mechanical loss and hydraulic loss are directly related to the roughness of the flow surface of the pump. The more rough the flow surface is, the greater the loss is. For a centrifugal pump with medium low specific speed, the loss is more serious. When n1=30, the disc friction loss, which accounts for the main part of mechanical loss, can increase to nearly 30% of the effective power. If the transition surface directly contact with the liquid and the roughness of the outer surface of the impeller can be reduced, the mechanical loss and hydraulic loss in the pump can be significantly reduced. Based on the above principle, the use of super skid metal coating can reduce the surface roughness and reduce the power loss of the pump.

Due to the erosion of sediment, water flow and medium, the horizontal multistage centrifugal pump impeller will gradually wear and corrosion. The blade surface often form grooves or striations, or by cavitation damage, blade honeycomb holes, and even perforation. If the blade casting with holes, sand holes or slag, running after the surface is easy to appear the blowhole, even cracks.

There are many methods to repair the horizontal multistage centrifugal pump impeller, impeller cavitation repair many methods, such as the use of ARC polymer composite coating protection, powder spraying (welding), epoxy resin coating and protective rubber, nylon composite material repair, as well as the use of stainless steel inlaid, welding etc.. The application of epoxy resin polymer coating has the advantages of simple construction method, low price and so on, and the effect is good. By optimizing the ratio and adjusting the performance index of materials, it shows high strength adhesive force and toughness of absorbing impact energy, and has high resistance to cavitation and abrasion failure strength and hardness.

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