Polyphase Flowmeters

These applications are for the measurement of the flows of one or more liquids intermixed with gases. (For details on this somewhat complicated measurement, refer to Section 2.17 in Volume 1 of the 4th edition of the Instrument Engineers Handbook.) 

There are many circumstances in which the ability to distinguish the components of a liquid-vapor-gas mixture (or, multiple immiscible liquids, vapors, and gases) in the presence of solids is highly desirable. The liquids and gases do not normally travel at the same velocity. The liquids are being 

Post-Oil Energy Technology After the Age of Fossil Fuels 

Installation of area-averaging Pitot tube ensembles in rectangular duct for metering the flow rate of gases. (Courtesy of Air Monitor Corp.) 

To improve the precision and reduce the cost of measurement, new techniques have been developed. These techniques differ depending on the liq-uid-to-gas ratio (known as LGR, or the inverse, GLR). The extreme end of the LGR (say, 10% by mass) is classified as wet gas. 

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