Only the pump body is replaced, while the motor remains unchanged. How to roughly estimate what percentage the power consumption is compared to the original level.
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The original main pipe pressure was 6 MPa; after optimization, it is now 5 MPa. The motor is reused by replacing the pump body. By how many percent can electricity consumption be reduced? Rough.
Can we just use the ratio of forces? Assume the original pump outlet pressure is 6 MPa. After replacing the pump body, the outlet pressure is now 5 MPa, with the flow rate remaining unchanged. The power consumption is roughly 5/6 of the original level. Estimation, without knowing the current.
There is a formula that can be used to calculate it precisely: KW/h = √3 × voltage in kilovolts × current × power factor. Calculate it and then multiply by the cost per kilowatt-hour.