Testing Centrifugal Pumps in the Field
The performance curves generated by many pump manufacturers are based on results obtained in their test facilities under tightly controlled conditions. The testing techniques used in the field can...
Reverse Engineering--an Alternative to Traditional Pump Repair
With reverse engineering, a pump service facility increased the performance of a service water pump in a nuclear power plant.When an East Coast nuclear plant wanted to increase the performance of its...
Vibration Analysis Simplified
Last year in “Trending Revelations in Vibration Analysis,” (Pumps & Systems, June 2009), I discussed the importance of statistic trending in vibrations analysis. Usually, as most would expect,...
The DEF Market
The diesel exhaust fluid market creates opportunities for pump manufacturers.Growth and innovation in industrial pump design and operation are often driven by outside forces. A common force is the...
The City of Hammond, Ind., recently received a large prefabricated housed booster system that will increase flow capacity for nearby residents by pressurizing the potable water from Lake Michigan.Two...
Centrifugal Pump Specific Speed
Specific speed is a concept developed for water turbines in 1915, which was later applied to centrifugal pumps (Stepanoff, 1948). Specific speed is a way to “normalize” the performance of these...
Performance Curves and NPSH Tests
Editor's Note: This is the fourth article the year-long series, Understanding NPSH. To read the previous article, click here. To read the next article, click here.NPSHR Shown as a Single...
Suction Specific Speed (Part Three): Using Suction Specific Speed to Establish Adequate NPSHA, net positive suction head, NPSH
Tenth in a SeriesA number of technical papers (1, 4, 7, 8) have shown that the maximum damage rate to centrifugal pumps, at least in water services, typically occurs when the NPSHA is in the range of...
Hydraulic Institute Pump FAQs January 2007
Q. I have been told that centrifugal pump impellers may still cavitate when operating with NPSH Available greater than NPSH Required. Is this true? If so, why do pump suppliers show NPSHR values when...
HI Pump FAQs May 2011
Q.  When pumping a liquid that has a viscosity greater than water, how can the effect of this higher viscosity on the pump performance be estimated?A.  The Hydraulic Institute (HI) has...
Vibration Analysis to Improve Pump Reliability and Save Energy
 Vibration analysis trending can be a helpful tool in predicting brewing problems, before they develop into a big issue. The Kemira/FinnChem plant (Kemira) in Augusta, Ga., started a vibration...
Pumps & Systems, April 2007Once upon a time, in power plant fuel oil transfer and injection services, it was difficult to justify replacing twin screw timed pumps when maintenance was already...
What is a Safe NPSH Margin for a Centrifugal Pump? Can You Provide Too Much NPSH?
What is a Safe NPSH Margin for a Centrifugal Pump?The Hydraulic Institute NPSHA Margin Work Group (1) recommended NPSH margins ranging from zero to four times the NPSHR (NPSHA÷NPSHR = 1 to 5). The...
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...
What is a Safe NPSH Margin for a Centrifugal Pump? Can You Provide Too Much NPSH?
Editor's Note: This is the fifth article in the year-long series, Understanding NPSH. To read the previous article, click here. To read the next article, click here.What is a Safe NPSH Margin for a...
In today's tough economy, many companies  face unprecedented challenges that are forcing them to scale back and rethink their approach to managing business. During financially challenging times,...
For many of us, water is the only liquid that flows through our centrifugal pumps. Consequently, specific gravity (SG) and viscosity are not factors when sizing them. But, if you work with other...
Hydraulic Institute Pump FAQs August 2011
Q. Some slurry applications include froth in the liquid, which affects pump performance. What must be done when selecting centrifugal pumps for such applications?A. Froth is an aerated liquid medium...
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...
Suction Specific Speed (Part One)
The Eighth in a SeriesNormalizing NPSHOur attempts to normalize or classify water turbine hydraulic performance culminated in 1915 with the development of the specific speed concept, which was later...
Hydraulic Institute Pump FAQs November 2011
Q.  What is a balanced mechanical seal, and when is it usually used? A. Balancing a mechanical seal involves reducing the effective forces on the seal faces. A general rule is to use a...
 Pumps & Systems, March 2007What's hot and what's not with pumps in the water/wastewater industry.Born in the 3rd century BC, pumps are one of the most important mechanical devices in all...
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...
Click Here for Solution to Pump Challenge #5 I want to know any useful information regarding annual surveys for pumps. What are their advantages and how useful are they?Ahmed SobhiSales Manager,...
Almost all centrifugal and rotary pumps require a sealing system to provide sealing integrity of the drive shafts carrying the impellers and protect against pumped fluid leakage and the environment...
Pump Vibration Monitoring Basics
Knowing the application's demands and the sensor's capabilities is critical for accelerometer selection.Vibration monitoring of critical and auxiliary pumping systems helps improve machine...
Pump Performance Monitoring
A Comparison Between Conventional and Thermodynamic MethodsEnergy conservation is the need of the hour. Pumps are found in abundance in almost every industry and utility. Of them, the most common are...
The Impact of the Area Ratio
In March 1980, I attended the ASME symposium on Predicting the Performance of Centrifugal Pumps and Compressors in New Orleans. I was about three rows from the podium, sitting next to a fellow who...
Proactive Bearing Maintenance
An unexpected bearing failure needs to be understood and seen as an opportunity for improvements.Centrifugal process pumps are workhorses of pulp and paper, oil and gas, chemical and other industries....