A number of choices are available when connecting pumps, fans and other rotating equipment to an electric motor. There are numerous mechanical and fluid coupling designs and, in some cases, a belt drive option is available.
How viscosity affects centrifugal pumps
In Pumps & Systems January 2007, I wrote an article about cavitation and how a collapsing water vapor bubble can damage an impeller. Since then, I have received a number of requests to address Net Positive Suction Head (NPSH) and its relationship to cavitation. Here it is in a very simple, Pump Ed 101 perspective.
Based on several of my previous Pumps & Systems articles, you probably know that I have major concerns about the off best efficiency point (BEP) operation of wastewater pumps.
One of the major impacts on motor life is common sense—or maybe the lack thereof!
There are several ways to control two identical, parallel pumps operating under variable frequency control in pumping applications.
This month we will quickly look at the load types that comprise a typical AC circuit.