Internal Clearance & Its Effect on Bearing Fatigue Life
End users must include bearing clearance as an integral part of designing or building a pump.
Long-Term Motor Reliability
A variable frequency drive’s effect on system efficiency and motor life
Motor Nameplate Letter Code Designations
Learn how to avoid misinterpretations.
Pumps & Systems, June 2009The pump industry is the largest purchaser of electric motors in the United States. According to the U.S. Department of Energy (DOE), electric motors consume more 50...
Protect Operators and Equipment with  Arc-Preventive Motor Control Centers
A strong safety program and preventive equipment are crucial for operator and equipment safety.
Powering the Pump: Diesel Versus Electric Motors
Make the ideal motor selection for irrigation applications.
Stainless Steel Motors
In the food industry, stainless steel performs more productively and efficiently.
Plant Upgrades Improve Efficiency at Midwest Refinery
Equipment and technology improvements can be sound investments.
Vertical Motors Help Solve Pumping Problems
The benefits of these motors provide the flexibility needed for challenging pump applications. In the early 1920s, California’s agricultural industry was booming. As the demand for the Golden...
Drives to Reduce Harmonics
Cost-effective solutions reduce harmonics and improve system reliability, efficiency. Energy efficiency requirements, regulatory compliance, increasing energy costs and improving system and...
Alignment Tolerances
The biggest decision is determining which tolerances to align. In the alignment training classes that we teach, questions arise about alignment tolerances. We often ask, “What are your...
Resonance and Its Effects on Mechanical Structures
Understanding resonance is essential for solving problems of increased vibration. Resonance is a condition that can occur in mechanical structures and can be described as sensitivity to a certain...
Retrolifting Lift Stations with Submersible Motors
In the February 2008 issue, we discussed various ways to lift water ("Lifting Water: What Are Your Pump Options?", Pumping Prescriptions). Starting with the 4,000-year-old Archimedes Screw, we touched...
Calculating Energy Savings and Payback
Energy efficiency and reduced consumption are important issues in the pump and motor marketplace. Over the long term, electricity costs will continue to increase regardless of our actions. This will...
Pump Noise and Vibration Attentuation
Unanticipated noise and vibration can be problematic for both occupants and processes within structures. Noise and vibration in piping systems can originate at pumps and other mechanical equipment. If...
Explosion Proof Couplings
Mechanically generated sparks, electrostatic discharge and high surface temperatures are all potential ignition sources in explosive atmospheres. Flexible couplings play a significant role in creating...
Disc Couplings 101
Most of us probably never notice the spinning cylinder mounted between the pump and motor, except how easy it is to dis/assemble when a pump or motor is changed out. Otherwise, the disc coupling never...
AC Motors Part Two-Three Phase Operation
Although a number of AC motor designs are used, the induction motor is, by far, the most common and will be the topic of this column. We will also focus on the three-phase design as it provides a more...
Pumps & Systems, June 2007 Named for a technique commonly used on failing pumps, "percussion maintenance" - where a technician beats on the pump's stalled motor with a hammer or rubber mallet...
Pumps & Systems, June 2008It is impossible to balance line-to-line voltages perfectly in a three-phase circuit. In fact, line voltages typically differ by a few volts or more, but a difference...
Pumps & System, June 2008Bigger Is Better-Or At Least It Used To BeOwing partly to tradition, the shafts of electric motors are often larger than those of the equipment they drive. Engineers were...
Pumps & Systems, September 2007A large wastewater processing plant experienced continual problems with its influent raw wastewater pumps for several years. These pumps are rated at 70,000-gpm,...
AC Motors Part 3-Single Phase Operation
It has been said that Washington, D.C., is the home of the largest invertebrate population in the U.S. This, of course, jokingly refers to the population of politicians and their lack of backbone or...
Pumps & Systems, October 2007With highly reliable electrical systems, protective relays may be called upon to operate very infrequently. However, the effects of faults and abnormal conditions can...
Water and wastewater systems in the United States use a tremendous amount of power. The EPA estimates that these systems use 50 trillion watt-hours annually at a cost of $4 billion. Combined with...
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. I will provide a reference to a more in...
InnovationIntroduced February 8, 2008, the RPMAC PM Direct Drive Cooling Tower Motor and VS1CTD Drive for wet cooling towers replaces an existing motor, jack shaft and gearbox with a more efficient...
The global economic downturn has resulted in an unprecedented attempt by world governments to help stimulate their individual economies, with the hope that these combined efforts will have a...
With highly reliable electrical systems, protective relays may be called upon to operate very infrequently. However, the effects of faults and abnormal conditions can be severe and protective relay...
Pumps & Systems, June 2007When a motor fails, users can (1) rewind, possibly for high efficiency; (2) replace the failed motor with a new motor; or (3) invest in a premium efficiency product. Here...