Columns and Blogs

I received many comments and suggestions on proper installation practices, following my article “Grouting: Pumps and Telephone Poles,” Pumps & Systems, July 2010).

Last month, we studied the properties and effects of resistive, inductive and capacitive loads in an AC circuit.

Using pump system analysis, from simple to the complex

As a follow up on my AC Motors series, I thought it would be a good idea to provide a short overview of work, power and torque as it applies to the AC motor.

When selecting a pump for variable speed operation, a number of conditions must be evaluated.

This is a follow-up to my column on predicting centrifugal pump performance (Pump & Systems, May 2011), and offers equations that will enable the engineer to perform a partial analysis of the impeller eye.

Starting can have a significant effect on the life of the winding insulation of an AC motor.

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

I expect damage on this scale with a large hurricane…but one tornado? It doesn't seem possible, but it happened.
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.
The massive oil spill in the Gulf of Mexico is troubling and sad on many levels. The long-term environmental effects are unknown, but the current goal is to remove as much oil from the water as possible.
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.
Our repair shop manager, Jerry, recently got a call from a plant to help solve a continual vibration problem with their end-suction process pump. Jim, the plant maintenance manager, was unhappy when we went to see him.
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.
Our repair shop manager, Jerry, asked me to accompany him on a trip to a power plant to determine the reason why a pump we had recently rebuilt was cavitating.
Why do those three affinity laws do such a good job of predicting the performance of a centrifugal pump when its rotational speed or impeller diameter is changed?

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