Can a regular high-pressure multi-stage centrifugal pump be modified later to add variable frequency speed control?
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It is a 250KW centrifugal pump that uses water as the medium. For process reasons, it sometimes needs to be operated with the valve fully open, at a minimum flow rate at the outlet; this seems like a waste and comes with many drawbacks. Is it possible to modify the pump by adding an adjustable frequency drive system?
Generally it’s fine; consult the pump manufacturer
There is no problem with pumps; for ordinary motors combined with frequency converters, considerations need to be given to motor cooling and harmonics. It is not recommended to use ordinary motors with variable frequency drives.
It’s not used very often either; it’s only used for about three to five days during startup and shutdown periods
Add a hydraulic coupling or a magnetic coupling. Or add variable frequency control, and change the motor to a variable frequency motor as well! The initial investment is relatively high, but if it operates at low flow rates frequently, it is still energy-efficient overall! You can first consult the relevant manufacturers to learn about the prices as well as the advantages and disadvantages, so as to decide what changes should be made! Or you can turn to an energy-saving company, which saves you the initial investment cost as well as electricity bills!