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Title: A Study Of Edge Sharpness Effects Measured During The Eec Orifice Plate Coefficient Programme
Author: E. Antony Spencer
Source: 1986 International Symposium on Fluid Flow Measurement
Year Published: 1986
Abstract: The EEC Orifice Plate Coefficient Project is being carried out under the joint sponsorship of the Commission of the EEC (the European Economic Community), and a number of participating organizations who are interested especially in the use of orifice meters for the accurate measurement of natural gas. In the course of the Project the plates themselves have been the subject of numerous physical examinations - notably of the edge sharpness - to check their continuing acceptability to the ISO 5167 Standard. The paper gives the background of how edge sharpness has been specified in the standards and briefly describes the different techniques used for its measurement. Earlier studies are analysed and applied to the results obtained in the EEC tests. It is concluded that normal plates give coefficients around 0.2 percent above the predicted values and a more objective method of measuring the edge profile must be adopted universally.

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