How does the rated current of a multi-stage centrifugal pump change after stage reduction?
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The facility is equipped with 3 high-pressure centrifugal pumps of grade 11, with a rated head of 1600 m and a rated motor current of 227.3 A. To reduce energy consumption, the grade of these pumps was reduced; first from grade 11 to grade 10, and then further to grade 9. What I would like to know is how the rated current of these centrifugal pumps changes after the grade reduction Is there a calculation method, or is it entirely based on experience?
The head decreases while the flow rate remains constant; by calculating the shaft power based on head, flow rate, and efficiency, the current can also be determined