Help needed with issues regarding the oil pump pumping water
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A new installation has been put into operation; when using a centrifugal pump to draw water, it is found that the frequency conversion rate increases above 50 and the pump then starts to lose pressure. Seeking solutions
The flow rate of the pump is proportional to its rotational speed; as the flow rate increases, the velocity also increases. The losses in the piping along the flow path are proportional to the square of the velocity. When the pipeline losses increase, the net positive suction head available for the device, NPSHa, decreases. As the flow rate increases, the required net positive suction head of the pump, NPSHr, also increases. Cavitation occurs when NPSHa is less than or equal to NPSHr. Typically, NPSHa-NPSHr should be at least ≥0.6m.