THE ANALYSIS OF COEFFICIENT DATA RELATING TO THE EEC 100 MM ORIFICE PLATES
In 1978 the Directorate General XII of the Commission of the European Communities approved a project to obtain fresh data on the discharge coefficients of orifice plates to be used when metering natural gas. This was to supplement the data obtained by Prof Beitler at Ohio State University in the early 1930s on which current standards are based, and those from a project launched in the mid 1970's by API and AGA in the USA. Tests have been completed using six plates in an EEC orifice meter run conforming to ISO 5167 and installed in 100 mm pipework. The plate diameter ratios varied from 0.2 to 0.75, and the pipe Reynolds number from 6.5 x 10**3 to 4.6 x 10**6. These tests were carried out between 1980 and 1984 at the National Engineering Laboratory, Scotland, in both water and high pressure air: at Gasunie, The Netherlands, using natural gas, and at Gaz de France, France, also using natural gas. The paper describes the various facilities, the test programme, and the statistical analyses which were carried out to evaluate the bestfit equations for the basic discharge coefficients. It has been found that the coefficients thus obtained are higher than those currently predicted by the ISO 5167 "Stolz" equation and that given in the American Standards. Though the results are still within the uncertainty levels given in the ISO Standard a systematic shift is indicated.
Bibliographic Reference: EUR 10974 EN (1986) MF, 35 P., BFR 150, BLOW-UP COPY BFR 200, EUROFFICE, LUXEMBOURG, POB 1003
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Record Number: 1989125041500 / Last updated on: 1987-07-01
Available languages: en