Columns and Blogs

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.

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.

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

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.

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

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.

Strengthening of bent shafts is a tricky and controversial process.

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

These days, the importance of a fresh water supply and safely-treated wastewater return to the river cannot be overemphasized. No matter how hard we try, we are still a long way from the most efficient, economic and reliable ways to ensure that our cities are properly equipped and ready for the clean water challenge.

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

How viscosity affects centrifugal pumps

This month we will quickly look at the load types that comprise a typical AC circuit.

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.

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

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.

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.

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