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Common Pumping Mistakes

elsey
Pumps
Why the Friction Head Curve Is a More Difficult System Component
Part 2 of Jim Elsey's column: The System Is the Boss.
Jim Elsey
Pumps
The System Is the Boss (Part 1 of 2 … The Easy Part)
Jim Elsey discusses two main factors that make up a system curve for a single centrifugal pump in an open system with a flooded suction.
Young's modulus
What Is the Root Cause of Shaft Failure?
A common misconception is that it is due solely to material strength.
Jim Elsey
The Effect of Cutwater on Pump Performance, Part 2
Avoid this unique and specific type of cavitation caused by the impeller passing too close to the cutwater(s) on a volute-style pump.
Jim Elsey
The Effect of Cutwater on Pump Performance, Part 1
The placement of the cutwater, its length, thickness, leading edge profile and flow angle all have roles in the casing efficiency.

Potential Issues for Flowrates
Pumps
Jim Elsey: Basic Advice Not to Overlook
In part 2 of this series, Elsey discusses best efficiency point.
Jim Elsey
Motors
Is Variable Speed a Magical Fix for Pumps? Part 2 of 2
In part two of this two part series, Jim Elsey discusses potential issues with variable frequency drives.
Jim Elsey
Pumps
Is Variable Speed a Magical Fix for Pumps? Part 1 of 2
Jim Elsey discusses the pros and cons of VFDs and VSDs.
Jim Elsey
Pumps
Pump vs. Pipe, Part 3
Columnist Jim Elsey on the common issues found on the suction side of the pump.
a well-engineered, designed and constructed pump-pipe system
Pumps
Pipe System Problems That Affect the Pump: Part 2
Common Pumping Mistakes
a well-engineered, designed and constructed pump-pipe system
Pumps
Pipe System Problems That Affect the Pump: Part 1
Common issues in horizontal centrifugal pumps in nonslurry applications that are used for pumping nonviscous Newtonian fluids.

Jim Elsey
Pumps
The Silent Pump Killer: Radial Thrust
Jim Elsey explores a common cause of pump failure.
Jim Elsey
Pumps
Pump Efficiency & the Pursuit of Perfection, Part 2
Jim Elsey looks at how to make the pump more efficient
 efficiency calculation
Pumps
How to Define & Measure Centrifugal Pump Efficiency: Part 1
Jim Elsey's first article of two explaining the pursuit of perfection in pumping
Jim Elsey
Pumps
Why Are There Holes in My New Impeller? Part 3
Common Pumping Mistakes
Single-stage end suction closed impeller
Pumps
Why Are There Holes in My New Impeller? Part 2
The second installment of Jim Elsey discussing how the impeller affects axial thrust and stuffing box pressure.
Pump out vanes are one method to manage axial force
Pumps
Why Are There Holes in My New Impeller? Part 1
Common Pumping Mistakes

The Basics of Pump Startup
Pumps
The Basics of Pump Startup: Part 2
In part 2 of this 2-part series, Jim Elsey instructs operators to do no harm.
Common Pumping Mistakes
Pumps
The Basics of Pump Startup
In part 1 of this 2 part series, Jim Elsey instructs operators to do no harm.
Jim Elsey
Pumps
What Is Suction Energy?
Reexamining how this concept can help you ensure a more reliable system
Bernoulli's Principle
Piping
The Three Musketeers: Static Pressure, Kinetic Energy and Potential Energy
Using Bernoulli's equation to calculate what will happen in a piping system.
Jim Elsey
Pumps
The Pump Selection Matrix
Common Pumping Mistakes

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Failure analysis can help define what a seal experienced during operation before failing.
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New standard for OH1 type pumps gives users more clarity and more precise specifications.
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