VFD on pump VS electrical economy

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Thread Starter

Benoit Galarneau

We have a project to replace pumps motor starters by VFDs in waste water pumping stations, and want to estimate potential electrical economy (in kwh)(i.e. pumps will run at slower rates but for longer periods, instead of running full speed for short periods). There is no flow control valve installed.

I know a lot of factors must be taken into consideration: motors specs, average daily pumped water volume for the station vs pumps capacity, static head, pumping curves, minimum speed allowed to prevent cavitation, etc...

Any advise or link to suggest?
 
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bob peterson

The critical things are how much pressure you need to develop and how much average flow you need. If the pressure you need to get the liquid where it has to go is close to what the pump develops at full speed, reducing the speed is not much help.
 
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