Rotary pumps are positive displacement pumps that use rotational, rather than reciprocating, motion during their pumping cycle. They can be designed to pump liquids, solids, gases or mixtures of all three.
My September tutorial took a look at the affinity laws and showed why each is able to predict changes in flow, head, and power when there is a change in pump speed or impeller diameter.
A discussion of the life and contributions of Daniel Bernoulli, who formulated the famous Bernoulli Principle.
There are several ways to control two identical, parallel pumps operating under variable frequency control in pumping applications.
When selecting a pump for variable speed operation, a number of conditions must be evaluated.