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DAVID W SPITZER'S E-ZINE (February 2020)


Application Impossible: The Automation Affair by Walt Boyes

Many years ago, I assisted in the design, specification, and installation of a highly sophisticated chlorination/dechlorination system for a tiny wastewater utility in Northern California. The plant discharged directly to the Eel River, so its NPDES (EPA discharge) permit was very strict as to the amount of chlorine residual they could discharge (0.0 percent).

Flowmeter Slippage: Avoiding the Avoidable by David W Spitzer

Every now and then, a portion of a published article or internet post catches my eye --- sometimes because it is well-thought-out and sometimes for the opposite reason. A recent article referring primarily to positive displacement flowmeters stated, under the leakage heading, that fluid leaking past the moving parts "rather than turning them... can occur when a meter starts from a zero-flow condition. To avoid slippage at low flow rates, installers may have to increase flow rate at startup, then back it off once the right momentum is achieved."

Flowmeter Selection by David W Spitzer

Which of the following flowmeters could be used to measure 10 to 100 gallons per minute (gpm) of liquid with a specific gravity of 1.20 and a viscosity of 500 centipoise (cP) in a 3-inch pipe?


In addition to over 40 years of experience as an instrument user, consultant and expert witness, David W Spitzer has written over 10 books and 450 articles about flow measurement, level measurement, instrumentation and process control. David teaches his flow measurement seminars in both English and Portuguese.


Spitzer and Boyes, LLC provides engineering, technical writing, training seminars, strategic marketing consulting and expert witness services worldwide.


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