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There are two ways to control the flow in a pumping system. First is to use a valve on the discharge of the pump. This can range from a simple manual valve, which can be throttled closed to reduce the flow rate through the system, to a process control valve, which uses an input signal from a controller to open or close to a specific position. The second is to control the speed of the pump using a signal from a controller.
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Positive displacement flowmeters that measure the actual volume of the fluid passing through the flowmeter (volumetric flow), flowmeters that measure fluid velocity, and flowmeters that measure mass flow were discussed in previous articles. These technologies measure volumetric flow, infer volumetric flow, and measure mass flow (respectfully).
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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.
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