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Lev Nelik

What Is NPSHr Stonewalling? by Lev Nelik
Pumps
What Is NPSHr Stonewalling?
Columnist Lev Nelik discusses NPSHr as a function of speed with a reader.
Reader’s Response: Overfiling & Underfiling of Impeller Blades - Lev Nelik
Pumps
Reader’s Response: Overfiling & Underfiling of Impeller Blades
Lev Nelik: Ask Dr. Pump
Pumps
Overfiling & Underfiling of Impeller Blades to Improve What?
Lev
Pumps
Reader Response, Part 2: Why Did Water Flow Reduce So Drastically?
Reader Mike Dominik, senior project manager at Orbital Engineering, Inc., explores the answer to the quiz question.
Lev Nelik
Pumps
Reader Response: Why Did Water Flow Reduce So Drastically?
Dr. Lev Nelik responds to an answer from his September column.

Lev Nelik
Pumps
Solution to Quiz: Why Did Water Flow Reduce So Drastically?
In the September issue of Pumps & Systems, a question was posed to our readers about water consumption and the cost of watering a small residential garden.
Quiz: Why Did Water Flow Reduce So Drastically?
Pumps
Quiz: Why Did Water Flow Reduce So Drastically?
Lev Nelik Headshot
Pumps
Solutions: What Makes the Meter Turn?
Nelik responds to reader answers.
Lev Nelik
Pumps
Pumping Predictions
From January 2010: Pumps and Systems in Transcontinental Energy Transfer
Lev Nelik
Pumps
Quiz: What Makes the Meter Turn?
Can you find the answer to this mini quiz?
Lev Nelik
Pumps
Vertical Turbines Repair Standard (VPRS), Part 4
An example of how decisions on picking one level versus another are made (continued).

Lev Nelik
Pumps
Vertical Pumps Repair Specification (VPRS), Part 3
An example of how decisions on picking one level versus another are made.
Lev Nelik
Pumps
Vertical Pumps Repair Specification (VPRS), Part 2
There is a structured document—a repair standard—in which different levels of repair can be applied.
Lev Nelik
Vertical Pumps Repair Specification, Rev. 1B
For larger pumps, however, a more thorough examination, documentation and restoration of internal concentricities must be done.
Outer unit before (left) and after (right), to improve hot air exit to outside
Pumps
Let’s Add Some Thermodynamics to Hydraulics! Part 2
temperatures of all rooms
Pumps
Let’s Add Some Thermodynamics to Hydraulics, Part 1
Lev Nelik
Pumps
The Current State of the U.S. Pump Industry
Columnist Lev Nelik shares his prognosis for the future of the industry.

Lev Nelik
Pumps
Reliability Considerations When Comparing Pump Types, Part 2
Columnist Lev Nelik discusses pump selection in part two of this two-part column.
Columnist Lev Nelik
Pumps
Reliability Considerations When Comparing Pump Types, Part 1
Columnist Lev Nelik discusses pump selection in part one of this two-part column.
Engineer written chart
Pumps
Your Guide to Quelling Noise & Vibration
These issues can cause serious issues, even leading to catastrophic failure.
lev Nelik
Pumps
Troubleshooting HVAC Pumping Systems, Part 2
Columnist Lev Nelik discusses piping systems with reader Lee Ruiz.
Lev Nelik
Pumps
Learn to Repair Pumps Properly, Part 2
Lev Nelik and reader Lee Ruiz dive further into efficiency in vertical turbine pumps.

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Help Us Help You (Back to Solving Pump Problem Basics, With a Checklist), Part 2
A set of checks to make when determining the issue with a pump.
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Improving Production & Reducing Dilution in Pulp & Paper
Why dilution is common and the benefits to reducing it.
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From Sludge to Cake: How Is Your Municipal Plant Moving It?
A look at lobe-style vs. progressive cavity pumps.

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