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This issue sponsored by Spitzer and Boyes, LLC

October 2015

Pump Control with a PLC (Part 1)

Years ago, when you wanted a pump station control panel, you bought a pump station controller. You can still do that, but many engineers are now designing their own, using a PLC and assorted sensors and other inputs, instead of buying one preconfigured and pre-programmed. click for more...

Part VIII: A Modified Control Strategy Eliminates Problematic Process Bubbles

For the last few months, I worked my way upstream from a liquid ammonia measurement problem to the pipeline to the ammonia tank farm and discovered that a pressure control valve at the ammonia tank farm exit was likely causing bubbles to form in warm weather and travel downstream where the bubbles affected the liquid ammonia ultrasonic flowmeter. click for more...

Affinity Laws for Centrifugal Pump Loads

A centrifugal pump is designed to flow 100 lpm of water at a pressure of 10 bar at full speed. Using the Affinity Laws, what is the approximate flow and pressure generated when a variable speed drive operates the pump motor at 70 percent speed? Approximately how much less energy is required at the lower speed? click for more...



In addition to over 35 years of experience as an instrument user, consultant, and expert witness, David W Spitzer has written over 10 books and 250 articles about flow measurement, level measurement, instrumentation, and process control. David (with Walt Boyes) is the author of seven Consumer Guides to various industrial flow and level technologies. David teaches his flow measurement seminars in both English and Portuguese.

Spitzer and Boyes, LLC publishes the Industrial Automation INSIDER that is an independent subscription newsletter for industrial automation and process control system users, installers and suppliers world-wide, giving a monthly update on the continuing evolution, development and convergence of automation technologies.

Spitzer and Boyes, LLC provides engineering, technical writing, training seminars, strategic marketing consulting, distribution consulting, and expert witness services worldwide, and can be contacted at +1.845.623.1830 or www.spitzerandboyes.com.


ISSN 1538-5280
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