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Cranston, RI, USA, March 4, 2015 – Editor’s note: This is Part two of Water Technology’s February feature titled, “The factors that impact Venturi meter accuracy.” In Part one, the author discussed how the materials used and the time in service can impact a meter’s accuracy. If you missed Part one, please visit WaterTechOnline.com to read the entire article. For Part two of this article, factors such as minimum to maximum flow rate effects on discharge coefficient usage, secondary instrumentation limitations, undocumented flow pattern effects and more will be discussed.

Depending on manufacturer’s claims, the classical design of a Venturi meter maintained a constant discharge coefficient down to a pipe Reynolds number (Rd) of approximately 200,000. This simply means that as long as the minimum flow rate Rd is maintained above this value, the discharge coefficient of the classical design (which is 0.984, in most cases) remains constant. If, however, the flow rate drops below a pipe Rd level of 200,000, there is a bias error that must be applied to the discharge coefficient, which will progressively lower its value.

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Cranston, RI, USA, February 1, 2015 – One of the main advantages of using a Venturi meter is the long, useful life expectancy of the meter body where other types of flow meters have a comparatively short life expectancy. It is not uncommon for water and wastewater utilities around the world to still depend on 100-plus year old meters, particularly in line sizes above 48 inches.

While there is clearly an advantage to a 100-plus year life expectancy, the question that is most frequently asked is, “What accuracy should I expect after 30, 40 or more years of service?”

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To participate in the annual conference supporting safe drinking water

Cranston, RI, USA, February 17, 2015 – Primary Flow Signal (PFS), the leading designer and manufacturer of innovative, durable, and accurate flow-metering solutions for water/wastewater, industrial, and oil & gas applications, announces its participation in the American Water Works Association Connecticut Section's annual conference, at the Crowne Plaza Hartford-Cromwell on February 24 in Cromwell, Connecticut.

The American Water Works Association is an international nonprofit educational association dedicated to sustainable safe water, with 43 sections in North America. This exclusive conference encourages industry leaders to network with over 397 water works professionals in the New England area that are making a difference in the industry.

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news photo 4 - 84.0 inch hvt-fv

84.0 Inch HVT-FV on Truck for Shipment