The issue of centrifugal pump efficiency
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Does API610 specify any requirements regarding efficiency deviations, since the efficiency of a pump is only an estimated value before it is manufactured? The second question is whether old motors might have some impact on the efficiency of centrifugal pumps? The third question is: will using a large motor to drive a small pump affect the efficiency of the centrifugal pump?
The questions you have raised aren’t actually problems. First, the estimated efficiency is determined by taking into account the company’s selection criteria as well as test data; the deviation will not be significant. Moreover, there is a margin of capacity in terms of motor power； Second, the efficiency of a motor decreases over time as it is used, but with proper maintenance, its efficiency will not decline and its lifespan will be very long ； Third, you are overthinking it
Is a deviation of 1-2 percentage points within the acceptable range?
Why can there be deviations in pump efficiency? It has nothing to do with the motor; as long as it doesn’t exceed the motor’s power rating, it’s fine
The efficiency of a centrifugal pump is primarily determined by three factors: volumetric losses, hydraulic losses, and mechanical losses. When the speed and flow rate of the pump remain constant, and there is no wear on the sealing rings nor any changes in the surface of the flow channels, with stable operation, the efficiency generally remains unchanged.