Columns and Blogs

Energy efficiency and reduced consumption are important issues in the pump and motor marketplace.

The radial forces that form about the periphery of a single volute pump's impeller are proportional to total pump head, impeller diameter and vane width. They are seldom balanced, but they reach their lowest intensity between 80 and 100 percent of BEP flow.

About 900 years before Newton formulated his universal gravitational theory, the Greek philosopher Aristotle espoused something different.

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.

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.

The frame sizes (physical dimensions) of AC motors have changed substantially through the years. Originally, they were considerably larger than those in use today. This increased size was the result of inefficiency and the need to dissipate heat.

Dr. Lev Nelik answers pump user questions.

The frame sizes (physical dimensions) of AC motors have changed substantially through the years. Originally, they were considerably larger than those in use today. This increased size was the result of inefficiency and the need to dissipate heat.

Efficiency degradation in pumps can be related to three areas.

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.

When the motor amps are kicking a unit offline, the first question is whether the motor or the pump is the problem.

One of the major impacts on motor life is common sense—or maybe the lack thereof!

While scheduled downtime is different from unscheduled, both can take away from a company.

There are several ways to control two identical, parallel pumps operating under variable frequency control in pumping applications.

Several million gallons of wastewater flow through a typical wastewater treatment plant daily. Some statistics show this can amount to 50 to 100 gallons for every person using the system.
Pumps & Systems is proud to report that business is strong. As we continue to provide high-quality, valuable and practical editorial, our readers continue to be loyal.
I expect damage on this scale with a large hurricane…but one tornado? It doesn't seem possible, but it happened.
The Fluid Sealing Association (FSA) has come a long way since its inception in 1933. With today's membership representing more than 85 percent of the manufacturing capacity for fluid sealing devices in North America, the association also has an international scope.
With damages estimated at $196 billion, the disaster in Japan is certain to impact the international economy.
I was happy to be able to write the article, “The World's Largest Pump Station,” in the March issue of Pumps & Systems. Hopefully, this monumental station will help prevent another disastrous flood in the Crescent City.

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