1)  Only select pumps with suction specific speeds less than 11,000-less than 9,000 is even better.2)  Select your pump so it never operates below 70 percent to 80 percent of its best...
 Cost Reductions Through Life Cycle Improvements
More than 15 years ago, a 160 in plate mill was experiencing significant maintenance problems with its descaling pumps; the typical mean time between repairs was only 6 to 8 months. Some rebuilt pumps...
As the global demand for energy grows, power companies are working to implement new technologies that would enable them to produce more power from existing stations. The following example demonstrates...
Home to the largest contiguous cotton-growing region in the world and encompassing more than 115 square miles, Lubbock is the economic, education and health care hub of the South Plains of Texas. With...
 Powerful Mine Dewatering
Electric and diesel centrifugal pump options
InnovationIntroduced to the market on June 8, 2009, the Multi-Stage CR-H provides a retrofit option for industrial users of traditional ANSI pumps. The CR-H can be used in a wide range of clean fluid...
In the Solution to Pump Challenge #3, we touched on efficiency and energy savings by approximating energy costs. Can we do this more precisely?Pump Challenge #4 asks that you evaluate energy saved...
Several years ago, a golf course community wanted to adorn its entrance with a waterfall. Rocks were arranged to form a wall about 12 ft high, and the water would flow over the wall and into a...
Repairing multistage, segmental diffuser, boiler feed pumps and maintaining the original performance can be difficult and challenging. In this case study, a comprehensive inspection and repair program...
 Solution to Pump Challenge #2: Moving a Pump from the Bottom of a Dry Pit
In the August 2009 issue, we considered the following challenge: From the available data tables, the vapor pressure of 150 deg F water is about 4 psia, or (x 2.31) = 9 psia.Initially, when the...
In Pump Challenge #3 (Pumping Prescriptions, September 2009), the specified parameters for energy estimation were 4,000 gpm and 400 ft. Using the Energy Estimator tool, you should receive the...
In Pump Challenge #4, many of you discovered while using the Energy Consumption Evaluator, that the standard listing only goes to 8x6-17 pump size with motor power maxed at 250 hp, which is below...
Many publications discuss the causes and cures of cavitation, but few address the reason those bubbles are so destructive. Boiling is the precursor to cavitation in a centrifugal pump. Boiling is not...
A New Way to Skin a Cat-Part 1
A Simplified Method for Monitoring Pump PerformancePump users should regularly monitor the condition of their critical centrifugal pumps to keep them operating efficiently. Otherwise, lost production,...
A “Solid” Solution to Pump Selection
 Tests show that solid-body plastic pumps are the best choice for oscillating applications.The demands that oscillating-displacement pumps place on their materials of construction are extreme due...
Acceleration Head
The Thirteenth in a SeriesIf a centrifugal pump is started with the discharge valve open too far and with a low discharge pressure, the liquid in the suction line may accelerate at a rate that causes...
As energy costs rise and energy efficiency becomes more important in operating pumping systems, equipment suppliers, system designers and operators will maximize the efficiency of system components to...
The Crowne Plaza Copenhagen Towers helps set new standards for sustainability, while the Grundfos Dormitory project is a living laboratory for circulator pump research.
Pumps & Systems, August 2007Conclusion of our look at a new tool that predicts how pumps and systems interact.Last month, I opened this discussion by explaining how the affinity laws are used to...
Analyzing the Impeller Eye
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...
An aggregate production company saves more than $30,000 annually with new installation efficiency and productivity increases.
Appropriate equipment selection and best-practice maintenance procedures can make a difference in reliability, service life and production.
Best Efficiency Point and Best Operation Point
The rise of bebop in the 40s and 50s had a major effect on the style and sound of both jazz and rock and roll. As a drummer with a jazz quartet during my college years, the bebop artists of the 50s...
Say goodbye to concerns about pump seizure: By properly applying composite materials to a troublesome boiler feed water pump, this large process facility in Alberta can now run one pump during...
Building Packages for Harsh Environments
The Gulf of Mexico (GOM) is one of the prime areas for the production of crude oil worldwide. The number of platforms is continuously increasing, and major oil and gas discoveries continue with...
Calculating Radial Thrust
The radial forces that form about the periphery of a single volute pump's impeller are proportional to total pump head, impeller diameter and vane width. They are seldom balanced, but they reach their...
An OEM and an end user had installed a number of large, double-suction pumps for a water pumping station project (Figure 1). Soon after, they began to suspect that the pumps were a significant...
Cavitation Issues During Multiple Pump Operation
Cavitation in pumps is a well known but unwelcome phenomenon. When imploding bubbles of pumped product undergo rapid phase transformation from liquid to vapor state, and then back to liquid, the...
Centrifugal Farce & Affinity- It's All About Velocity
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? Well, it turns out that they are not...
Centrifugal Pump Efficiency—Preservation of Efficiency
Editor's Note: This is the fourth in a six-part series on centrifugal pump efficiency. For other articles in this series, click here.The performance of a centrifugal pump with a trimmed impeller will...