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The pump efficiency can be reduced by three of these losses: Mechanical, Volumetric, and Hydraulic. Moving components are related to mechanical losses such as bearing and glands; Leakage of fluid is related to Volumetric loss such as discharge side of the pump to the suction side and frictional forces that are created between the fluid walls of hydraulic passage that quickens and changes the fluid direction is related to hydraulic loss.​

What Is Pump Corrosion?
Corrosion or erosion causes wear on the pump, impeller, suction side plate, or nozzle. In general, pump wear or material loss can easily cause the pump to deviate from its BEP (best efficiency point) curves. Either can reduce the MTBF (mean time between failures) and make finding the true root cause difficult. What most of us don't realize when dealing with these issues is that the whole cost of maintenance, production, and downtime can make the original pump cost appear extremely low. Erosion Corrosion is the result of a combination of erosion and corrosion occurring in the presence of a moving corrosive fluid or a metal component moving through the fluid, resulting in a  rapid metal loss.

What causes Pump Corrosion?
When the mechanical effect of a fluid's flow or velocity is combined with the fluid's corrosive activity, the metal loss is accelerated. The mechanical removal of protective films is done in the initial stage and then the corrosion from the bare metal by a flowing corrosive takes place. Unless the tear of the component occurs, the process is cyclical. Corrosion-erosion is usually found around the tube blockage, in the ends of tube inlets or pump impellers. When both corrosion and erosion are present in the operating conditions, the degradation of the mechanism can become very complex and depends upon the substrate and the chemistry of fluid. Oxide layers are created by corrosion on the low adherence, to the substrate that is prone to erosion. The passive layers can be damaged by erosion that leads to activation on the surface that quickens corrosion. Protection on surfaces is the core solution in this type of case. Additional Read: Variables that Plant Engineers need to consider before Purchasing Industrial Pump

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