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Title: Design And Operation Of Primary Elements
Author: Ray Forbes
Source: 1969 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1969
Abstract: The principal forms of primary devices, or differential producers, are the thin plate concentric orifice, the flow nozzle, and the venturi tube. The use of the venturi tube can be justified when low head loss is essential and sometimes when the measured fluid is carrying solids which would collect in front of an orifice plate or flow nozzle. The flow nozzle has a high coefficient, about equal to that of a venturi tube. It is useful on high velocity flows such as frequently encountered in steam lines. It will accommodate a greater flow than an orifice plate for a given differential and throat diameter.

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