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1. Net Positive Suction Head: NPSHR and NPSHA
(Pumps/Centrifugal Pumps)

...on that occurs due to a 3 percent performance degradation should be regarded as incipient cavitation. Joe Evans is the western regional manager for Hydromatic Engineered Waste Water Systems, a ...

2. Power Factor: Electricity Behaving Badly (Part One)
(Motors/Motors)

...ow it can often provide a simple fix for low power factor caused by inductive reactance.   Joe Evans is the western regional manager for Hydromatic Engineered Waste Water Systems, a ...

3. How Curve Shape Can Influence Pump Selection
(Pumps/Pumps)

...urve should also be considered. If efficiency decreases slowly, lower flows will require less energy. Joe Evans is the western regional manager for Hydromatic Engineered Waste Water Systems, a ...

4. Power Factor (Part Two): Electricity Behaving Better
(Motors/Motors)

...e beginning to see mandated PF correction for power supplies that exceed a certain power requirement. Joe Evans is the western regional manager for Hydromatic Engineered Waste Water Systems, a ...

5. Vortex Action: How Lower Efficiency Can Reduce Overall Cost
(Pumps/Centrifugal Pumps)

... above, and many more like it, overall cost and reliability can be far more important considerations. Joe Evans is the western regional manager for Hydromatic Engineered Waste Water Systems, a ...

6. Various Ways to Determine Pump Flow in the Field
(Pumps/Pumps)

...cy of the power factor and motor efficiency is a drawback. (Reference power factor fundamentals presented by Joe Evans in "Power Factor: Electricity Behaving Badly (Part One)" (Pump Ed 101, ...

7. Confusing Units of Measure: Work, Power and Torque
(Motors/Motors)

...ld!). If we are going to make this system the standard, it will have to start in grade school. Joe Evans is the western regional manager for Hydromatic Engineered Waste Water Systems, a ...

8. Parallel Pumping (Part Two): Other Considerations
(Pumps/Centrifugal Pumps)

...tion of the primary pump, a wider range of variable speed flow and soft start and stop of both pumps. Joe Evans is the western regional manager for Hydromatic Engineered Waste Water Systems, a ...

9. Revisiting the Affinity Laws for Pumping Systems
(Pumps/Pumps)

...ent other than 2 used for a system curve. RXP: I asked Pumps & Systems Contributing Editor Joe Evans to respond to your comments. He says, ". . . my experience has been with pum...

10. Siphons and the Siphon Effect: That Sucking Sound
(Piping/Piping)

...aintain flow will be h1 plus the sum of the heights of the air pockets in each down leg.   Joe Evans is the western regional manager for Hydromatic Engineered Waste Water Systems, a ...

11. Process Control (Part One): Smart and Not So Smart Control
(Controls/Controls)

...D" can help proportional control do a better job in applications where feedback changes quickly. Joe Evans is the western regional manager for Hydromatic Engineered Waste Water Systems, a ...

12. Process Control (Part 2): Even Smarter Control
(Controls/Controls)

...l with P and I alone, there is no need to use D. If reaction time is critical, D is always available. Joe Evans is the western regional manager for Hydromatic Engineered Waste Water Systems, a ...

13. Parallel Pumping (Part One): Parallel and Not So Parallel
(Pumps/Centrifugal Pumps)

...e complex system curves produced by a combination of vertical lift, force main pressure and friction. Joe Evans is the western regional manager for Hydromatic Engineered Waste Water Systems, a ...

14. Process Control, Part 2: Even Smarter Control
(Resources/Industry News)

...l with P and I alone, there is no need to use D. If reaction time is critical, D is always available. Joe Evans is the western regional manager for Hydromatic Engineered Waste Water Systems, a ...