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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.