Pump Challenge #1 - an impeller cut problem - is an application of the Affinity Laws to reduce the motor amps and solve a motor tripping problem. The full details of the challenge can be seen by...
Dear Readers: In the next three issues, we will present three Pump Puzzles  to solve. The first one-an impeller cut problem-is an application of the Affinity Laws to reduce the motor amps and...
The U.S. Navy pumps brine for distillation units, transfers sewage from CHT tanks and pumps wastewater for shipyards. Conventional pumping technology, however, was requiring high levels of...
Modifications can be made to many older pumps to improve on their original design. Pump rebuilders with experienced engineering staffs can provide these modifications and upgrades to substantially...
Grouting: Pumps and Telephone Poles
A few years ago, Corbin Spitzer from Spitzer Associates (Houston, Texas) correctly challenged a view in my article "10 Steps to Proper Alignment" (Pumping Prescriptions, October 2005). Spitzer...
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...
Parallel Pumping (Part One): Parallel and Not So Parallel
Suppose, for a moment, that you are lounging on a beach somewhere in the vicinity of the equator.  If you were to draw side by side two lines in the sand, both heading due north, they will appear...
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...
Do Pumps Require Less NPSH on Hydrocarbons? Stepping NPSHR to Different Speeds
Do Pumps Require Less NPSH on Hydrocarbons?Yes.The extensive application of pumps to hydrocarbon services in the first half of the 20th century produced numerous observations that centrifugal pumps...
Suction Calculators
Last month I reviewed an Excel-based Radial Thrust Calculator and showed how it can predict the magnitude of unbalanced radial thrust when a centrifugal pump is operated to the left of BEP. This month...
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...
Suction Specific Speed (Part Two)
Graph of Minimum Continuous FlowsIn 1982, Richard Dubner of Chevron developed a graph for use in establishing minimum continuous flow rates for centrifugal pumps (see Figure 1). It allows a lower flow...
InnovationIntroduced February 6, 2008, the patent pending Goulds 3196 i-FRAME uses ITT proprietary software to perform continuous temperature and vibration monitoring and alert end users via light...
Hydraulic Institute Pump FAQs January 2010
Q. I understand the significance for properly configured suction piping, but what are the piping requirements on the discharge side of a rotodynamic (centrifugal) pump?A. The maximum velocity at any...
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...
Maximizing Your Rental Experience
In many cases, users rent pumps to help them meet specific project requirements. The user does not always want to purchase a pump because he may not have the knowledge, manpower or time to service and...
 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...
Packaged Pumping Applications and Best Practices
Packaged pumping systems are gaining in popularity due to benefits including ease of installation, single source responsibility and streamlined manufacturing. Packaged systems simplify the...
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...
HVAC Centrifugal Pumps: Past, Present and Future
Centrifugal Pumps have and will continue to be a vital player in the HVAC industry.Look at the skyline of any major U.S. city. The number of buildings is staggering. Given the fact that pumps in HVAC...
Design of Trench-Type Wet Wells for Pumping Stations
Pumps & Systems, May 2008In trench-type wet wells, the pump intakes are placed near the bottom of a deep, narrow trench coaxial with the inlet pipe but considerably below it (see Figure 1). The...
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...
Sims Pump Co. Reduces Energy Consumption by 20 Percent with Structural Graphite Composites
Pumps and Systems Success Story of the Year 2010 FinalistThe impeller of the Central Saltwater Cooling Pump on the USNS Lewis and Clark was demonstrating premature wear and efficiency from corrosive...
Slow Down and Think Causally to Solve Pump Problems
 Is it becoming harder to find time to think instead of react? The blistering pace of information bombarding us and being requested drives us farther into the abyss of reactivity. It is...
Use Simple Pump Troubleshooting Methods Before Rushing to Fancy Analysis
When the motor amps are kicking a unit offline, the first question is whether the motor or the pump is the problem. Before any sophisticated troubleshooting methods are applied, most experienced...
Hydraulic Institute Pump FAQs September 2010
Centrifugal pumps: do they handle slurries, and what is their maximum allowable working pressure?Q. How do rotodynamic (centrifugal) pumps perform when handling slurries?A. The performance of a...
Predicting Centrifugal Pump Performance
It is said that old pump men never die—they just lose their prime—and I fear that is partially true. Therefore, before I lose my prime, I thought I'd share some equations with some of you younger...
Hydraulic Institute Pump FAQs October 2010
Bearings used in high-temperature applications, suction recirculation in pumps and Newtonian and non-Newtonian fluids Q. We are frequently replacing the ball bearings in an end suction pump that is...
Specialty Materials Help Improve Pump Reliability and Save Energy
Efficiency degradation in pumps can be related to three areas. Worn clearances between the wear rings of the impeller and the casing can increase leakage and drop the volumetric efficiency of the...
Stable and Unstable Pump Curves
A “stable” curve is important for pump operation, especially for pumps in parallel operation. The higher the energy level and the more critical an installation, the more the pump curve could...