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Title: A Data-Driven Predictor Of The Discharge Coefficient Of Orifice Plates
Author: James R. Whetstone Antonio Possolo
Source: 2015 International Symposium on Fluid Flow Measurement
Year Published: 2015
Abstract: We have developed a new functional relationship to predict the value of the discharge coefficient of an orifice plate used to measure volumet- ric flow rate in cylindrical pipes, as a function of the beta ratio of the orifice and pipe combination, and of the Reynolds number of the flow. This relationship is empirical, resulting from fitting a data-driven uni- versal approximant to a large collection of experimental data gathered at the National Institute of Standards and Technology during the 1980s, within the scope of a collaborative project with the American Petroleum Institute (API), and published as NIST Technical Note 1264. The perfor- mance of this new relationship compares favorably with the conventional Reader-Harris / Gallagher equation originally developed for the American Gas Association (AGA), and it is more widely applicable, achieving typical relative accuracy in the range of 0.05 % to 0.2 %.

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