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ASME MFC-12M

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ASME MFC-12M 2006 Edition, October 9, 2006 Measurement of Fluid Flow in Closed Conduits Using Multiport Averaging Pitot Primary Elements

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Description / Abstract: This Standard, provides information on the use of multiport averaging Pitot head-type devices used to measure liquids and gases. The Standard applies when the conduits are full and the flow

(a) has a fully developed profile

(b) remains subsonic throughout the measurement section

(c) is steady or varies only slowly with time

(d) is considered single-phase

A differential pressure transmitter or other pressure measuring device, known as a secondary element, must be used with a multiport averaging Pitot primary element to produce a flow rate measurement.

Although multiport averaging Pitot primary elements are sometimes used in noncircular conduits, such applications are beyond the scope of this Standard.