### Understanding pump curves 4: variable speed – the answer ...

2013-7-15 · Well, yes, this is the whole point of VSD. Changing the pump speed changes the pump curve. So how well does this work and how can we calculate what will happen? To figure this out, we need to understand the centrifugal pump “Affinity Laws” Affinity Laws – Modify the Pump Curve The performance of a centrifugal pump will vary with speed according to the formulae below (Fig …

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