Lev Nelik
Gauge Correction & Velocity Head Correction Can Matter
Lev Nelik responds to readers' questions about calculating and estimating pipe velocity
Calculating vs. Estimating Pipe Velocity
Columnist Lev Nelik says it is important to know when you can use a shortcut, and when to go the long way.
Readers Respond to ‘A Step-by-Step Approach to Pump Selection’
Lev Nelik explains calculations from the Moody diagram.
A Step-by-Step Approach to Pump Selection
Consider pipe sizing and motor power requirements before picking your pump.





Pumps & Systems Looks Back: Pump Design Changes Improve Lubrication
Quantifying the benefits of modifications.
Energy Efficiency for River in the Desert
Lev Nelik answers reader's question about an Israeli infrastructure water project.
Developing Water Infrastructure Project in Israel
Choosing fresh water or salt water for a man-made river
Middle East: What’s New with Water Pumping Challenges in Israel?
Lev Nelik explains water distribution developments in Israel.





Pumps-to-System Control of Power Plant Boiler Feed Pumps
Dr. Nelik and other experts make recommendations for an engineer in a Middle Eastern plant.
Seal Damage Due to Loads
Casing changes cause efficiency effects.
Seals: Skinny Shaft Design or Improper Operation?
Pumping Prescriptions
Various Ways to Determine Pump Flow in the Field 
Pumping Prescriptions
Letter from a Reader
Pumping Prescriptions
Failure Prediction with Online Monitoring
Pumping Prescriptions
Pumps Field Efficiency Testing Automation 
Pumping Prescriptions
Case Study: Troubleshooting Seal Problems in Cooling Water Pump Solution, Pump 4
Pumping Prescriptions
Meet the Pumps & Systems Columnists
As we celebrate National Columnist's Day, learn more about our monthly authors.
Case Study: Field Efficiency Testing for Pumps
Pumping Prescriptions
Troubleshooting Mechanical Seals in Vertically Mounted Pumps
Pumping Prescriptions
Case Study: Troubleshooting Seal Problems in Cooling Water Pumps, Part 3
Pumping Prescriptions
Case Study: Troubleshooting Seal Problems in Cooling Water Pumps, Part 2
Pumping Prescriptions
Case Study: Troubleshooting Seal Problems in Cooling Water Pumps, Part 1
Pumping Prescriptions
Another Look at Optimizing Pump Hydraulics
Pumping Prescriptions
How Far Off Is Your Motor Power Rough-Sizing? 
Pumping Prescriptions
What Happens to Power & Efficiency When a Pump Wears Out?
Pumping Prescriptions
Optimizing Pump Hydraulics: When Is it Important?
Pumping Prescriptions
What You Need to Know about NPSH & Cavitation 
Pumping Prescriptions
Eight-Year Study Reveals Vital Knowledge about Pump Reliability
Pumping Prescriptions
Choose the Right Types of Pumps for Your Application
Pumping Prescriptions
Letter from a Reader: Vibration Spectrum Analysis
Regarding the vibration spectrum on page 12 of the February 2016 issue of Pumps & Systems ("Using Pump Efficiency Monitoring to Make Faster Decisions," Figure 1, see image below and read the whole...