Columns and Blogs

Early centrifugal pump design was heavily influenced by turbine technology during the mid to late 1800s.

(Feb. 14, 2012) Thanks for all the kind; productive; and in some cases, critical feedback about our January 2012 feature, “The History of Pumps.”
How repair standards should be evolving
In this multi-part series, we will investigate several aspects of centrifugal pump efficiency. First of Five Parts
The McGraw-Hill scientific dictionary [5] states that a volute is "a spiral casing for a centrifugal pump... designed so that speed will be converted to pressure."
Specific speed is a concept developed for water turbines1 in 1915, which was later applied to centrifugal pumps (Stepanoff, 1948). Specific speed is a way to “normalize” the performance of these hydraulic machines.
Tackling 4,000 years of pump technology and evolution in only eight pages of magazine space has been like trying to summarize War and Peace in one sentence.
Temperature changes can push pipe force beyond safe limits
Keeping a close eye on pump efficiency can lead to energy savings.

It's a New Year, time to make those New Year's resolutions.

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!

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