Last September, we spoke about the importance of pipe-to-piping alignment, evaluating actual numbers, and tabulating stress values as they approach yield stress of pipe at various values of misalignment. This time, we will discuss the effects of pump-to-motor misalignment, beyond hype or generalities, by numerically quantifying the conclusions.

Last month, we ended with a discussion of the relationship between peak and RMS (or effective) voltage.

Couplings are often forgotten until a project is nearing its end.

A large wastewater processing plant experienced continual problems with its influent raw wastewater pumps for several years.

Couplings are often forgotten until a project is nearing its end.

Back in the early seventies, when I was in grad school, our government pledged to convert the U.S. measurement system to the metric system. A popular cartoon at the time showed a lab technician with a box of amputated human feet standing at the door of the supply room. The supply clerk was also holding a box, but his was full of volt meters. The caption was "Trading Feet for Meters." That was almost 37 years ago, and we still have most of those feet! I guess that I could say that we are still "inching" into the metric system.

Advanced motor protective relays provide superior protection for motors and pumps. pump system optimization

A flexible coupling's primary functions are connecting two shafts, transmitting power from a driver shaft to a driven shaft and accommodating the misalignment between them.

The SI system is the modern day version of the metric system, and the U.S. gets a lot of grief for not embracing its inherent transportability across international boundaries.

Owing partly to tradition, the shafts of electric motors are often larger than those of the equipment they drive.

Last September, we spoke about the importance of pipe-to-piping alignment, evaluating actual numbers, and tabulating stress values as they approach yield stress of pipe at various values of misalignment. This time, we will discuss the effects of pump-to-motor misalignment, beyond hype or generalities, by numerically quantifying the conclusions.

The industrial motor world has a new specification available for defining the requirements of general purpose, severe duty motors in the 250- to 3,000-hp range.

Proper alignment of the pump shaft with the driver can reduce vibration and significantly improve reliability.

For the first time, the United States Department of Energy (DOE) adopted energy conservation standards for small electric motors in February 2010.

Mechanical resonance occurs when an external source amplifies the vibration level of a mass or structure at its natural frequency.

It is impossible to balance line-to-line voltages perfectly in a three-phase circuit.

Bigger is better — or at least it used to be

After spending money on a powerful new pump and the motor to run it, the next big decision is how to connect the two in a way that maximizes their efficiencies and protects them from normal wear and tear.

Significant energy and money savings are realized when using variable speed motors controlled with drives.

This three part primer is a basic introduction to AC power for those in the pump industry who need a place to start. It will also provide several web references to access if you would like to further your understanding of this interesting and essential topic.

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