Columns and Blogs

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.

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.

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.

Efficiency degradation in pumps can be related to three areas.

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

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

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.
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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.
With property damage estimated at $81 billion and more than 1,800 lives lost, Hurricane Katrina remains the costliest and deadliest natural disaster in U.S. history.
What do you want to know about what's going on with FSA and the sealing industry?
The pump world is buzzing about the recent news of ITT Corporation's decision to split the company into three distinct, publicly-traded companies.
One of civilization's earliest inventions, pump technology has not changed much through the years. Since 200 B.C., pumps have moved water and other viscous materials from Point A to Point B. No matter the consistency of the liquid—whether it's peanut butter or oil—there is a pump that can suck, push or lift it to its destination.

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