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Lifting Water: What Are Your Pump Options? Written by Dr. Lev Nelik, P.E.    Consider a typical sewage collection system. At the initial point of discharge, water first flows (by gravity) into a network of (sloped down) drain pipes, which gradually intercept a larger main pipe. Eventually, all this water needs to be lifted to a sewage wastewater . . . Tags: read more...   Process Control, Part 2: Even Smarter Control Written by Joe Evans, Ph.D.    Dynamic Control: The I&D of PID Editor's Note: This is the second part of a two-part series on Process Control. The first part, available in the January 2008 issue on www.pump-zone.com, discussed the P-proportional control-of PID. This month we'll look at I and D. Tags: read more...