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Title: The Basic Coefficient Data Determined In The Eec 2 50 mm Orifice Plate Program
Author: B. Harbrink, H. Bellinga, J. De Jong, F.C. Kinghorn, R. Norman, J.P. Vallet
Source: 1986 International Symposium on Fluid Flow Measurement
Year Published: 1986
Abstract: In 1978, the Directorate General XII of the Commission of the European Communities approved a major study to provide improved information on the discharge coefficients of orifice plates. The objective of the project was to create a wide data base going beyond Professor Beitlers data from the early thirties for flange and D and D/2 tappings and the data of the West German VDI Committee for corner tappings. These two sets of data represent the basis of the Stolz equation in the current ISO Standard 5167. A similar project was launched by API and AGA/GRI in the U.S.A. in the mid-seventies. In the EEC Ccimpaign, orifice plates of six different diameter ratios varying between 0.2 and 0.75 and two different thickness sizes for DN 100 and DN 250 pipework were tested. The pipe Reynolds numbers ranged from 5 x 10 to 3.5 x 10*. The basic calibration data for the DN 100 orifice plates have already been published by the EEC (1). A paper on the results of a first approach to the analysis of these data was presented at the NEL Conference in June 1986 (2).

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