Pumps & Systems, June 2007Shaft failures do not happen everyday, but when they do, it can be a challenge to determine the cause of failure. Here's a technical explanation of what happens when the...
AC Motors Part 5: AC Motor Life
One of the major impacts on motor life is common sense—or maybe the lack thereof!It always amazes me how many open drip proof (ODP) motors are used in agricultural irrigation applications where...
Operation and Maintenance of Vertical Motors
 Construction features are key to vertical motor application and maintenance.The definite-purpose application of vertical motors dictates a number of construction features that set them apart...
The Case of Action/Reaction
 Energy efficiency may not always mean total efficiency.The Department of Energy (DOE) has adopted new energy conservation standards for electric motors. The DOE has determined these standards...
Smart Motor Management
Data-driven visibility helps protect industrial processes and motors.Industrial producers typically invest millions in their infrastructure. Despite such investments, many production facilities lack...
Proper Alignment of Large Motors & Pumps
 A large utility company confronts alignment of a 5,000-horsepower motor.Installation and setup of a pump and motor can be easy for small systems. Both can be lifted with relatively small...
Motors, Drives Improve High-Rise Condo Efficiency
Significant energy and money savings are realized when using variable speed motors controlled with drives.The Villa Magna, a 92-unit luxury condominium in Highland Beach, Fla., sits between the...
Bigger 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 very conservative a century...
Editor's Note: Click here to see a sample alignment data form.Proper alignment of the pump shaft with the driver can reduce vibration and significantly improve reliability. For appropriate...
Optimized Energy-To-Thrust Ratio and Mechanical Reliability: The Keys to Submersible Mixer Cost Efficiency
Energy is the largest ongoing cost of mixer operation, so it is vital to carefully consider the energy-to-thrust ratio (sometimes called the “water-to-wire” ratio) for each and every mixer...
Advanced motor protective relays provide superior protection for motors and pumps.For years, motor overload relays have been used to protect pumping systems. Traditionally, they monitored current to...
The economic downturn has delivered a heavy blow to the industrial manufacturing sector in North America. Manufacturers are indicating sales drops of 30 percent to nearly 60 percent compared to that...
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...
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...
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...
Pump and Systems, June 2009 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...
Because operational costs ride on efficiency determinations, accurate measurements of losses occurring within the motor are paramount. The reliability of efficiency data is key to any energy-savings...
Pumps & Systems, September 2007 Because operational costs ride on efficiency determinations, accurate measurements of losses occurring within the motor are paramount. The reliability of...
Pumps & Systems, June 2008 Due to the expense and labor required, most facilities need to maximize the life of their motors. Electrical, insulation resistance and thermal measurement are three...
Following the development of variable frequency converter drives during the 1990s, totally enclosed fan-cooled (TEFC) AC induction motors became viable options for replacing DC motors in pumping...
Pumps & Systems, June 2008 An argument in favor of IEEE-841's provision for motor bearing protection. In June, 2007, a reader asked Electrical Apparatus magazine, "How long should motor bearings...
Pumps & Systems, June 2007 Why integrating vibration monitors with process controls provides fast response to pump faults, adds predictability and avoids unexpected shutdowns.  ...
All electric motors (motors) have a housing that contains the working components of the motor. In the U.S., the enclosure describes this housing. The enclosure should meet specific environmental...
When maintaining motors, proactive strategies are required.Whether the subject is motors, a maintenance department or an entire organization, typical maintenance methods are categorized as reactive,...
Pumps and Systems, June 2009 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...
Current state and growth opportunities The low voltage motors market is highly consolidated, with the top five participants accounting for more than 75 percent of the market revenues as of 2009. Low...
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...
  Pumps and Systems, February 2007 Last September, we spoke about the importance of pipe-to-piping alignment, evaluating actual numbers, and tabulating stress values as they approach yield...
A paper or an electronic work order system can be used to capture alignment data.   Click here for a downloadable pdf. Click here to read Pump...
Pumps & Systems, October 2008 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...