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Vortex Shedding and Fluidic Flowmeter Applications (Part 4 of 4) by David W Spitzer and Walt Boyes

Plastic/Polymer Vortex Shedding and Fluidic Flowmeters
Many vortex shedding and fluidic flowmeters are metal however, many vortex shedding and fluidic flowmeters constructed of plastics and polymers. These flowmeters are often used to measure the flow of high purity water and other fluids. Many plastic/polymer vortex shedding and fluidic flowmeters are small, but they can be as large as 225 mm (9 inch).

The Verdict Is In by David W Spitzer

Previous articles described the sewage collection systems for two adjacent sewage districts where the flow measurements used to allocate expenses and bill one of the sewage districts flowmeters was questioned in court.

My testimony was strained with the first sewage district (my client) attempting to ask me questions that would reveal issues with the flowmeter installations and their accuracy, only to have the judge sustain the second sewage district's objections. In the end, some of my findings were revealed to the court and the local press. On a side note, members of the local press attended this hearing because the alleged overbilling caused contention between the people in the two sewage districts for so long that people who lived in the first sewage district reportedly avoided shopping at stores located in the second sewage district.

Orifice Plate Flowmeter Transmitter Application by David W Spitzer

An orifice plate is sized to produce a differential pressure of 0 to 100 inches of water column (WC) corresponding to zero to full-scale flow respectively to measure steam flow through a nominal 200# steam header where the flowmeter is located approximately 25 feet above grade. The differential pressure transmitter will be mounted on a pipe stand for convenient access. What is the approximate bench calibration of the differential pressure transmitter?


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 500 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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