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DAVID W. SPITZER'S E-ZINE
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TECHNICAL AND MARKETING SERVICES
FOR INSTRUMENTATION SUPPLIERS AND END-USERS
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The concept that these flowmeters are not able to measure at low flow rates is important because in many applications, significant amounts of fluid at low flow rates can pass through the flowmeter without being measured. Because the density of most liquids is in a relatively small range centered about the density of water, it is common to assume that the minimum velocity constraint for water (as determined by the supplier) is close to the actual minimum velocity constraint of the fluid. Due to differences in sensing systems, it is advisable to consult supplier literature to determine the minimum velocity constraint.
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Selecting flowmeters for pipelines where liquid flow is downward requires careful consideration, as such applications can pose measurement problems.
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Flowmeters are typically specified with connecting flanges that correspond to the piping specifications. However, the details involved with pipe flange ratings can also be misunderstood because there are a number of factors that can impact the pressure capability of a flange.
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Spitzer and Boyes, LLC sells
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ISSN 1538-5280
©2008 Spitzer and Boyes, LLC
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