Objective
PROJECT MTR00016 PROJECT DEFINITION Orifice plate meters are widely used for the metering of natural gas, hydrocarbons, industrial products, water etc with an uncertainty under ideal conditions of 0.7 to 1.0%. In order to obtain this uncertainty meters must be designed and used in accordance with the provisions of ISO 5167 which is based on experimental data obtained in the 1930's. With the increase in energy prices in 1978 it was decided to determine a new data base with a view to revising ISO 5167. To this end parallel programmes of work were started in Europe and the United States. RESULTS The European programme concentrated on determining the discharge coefficients of a 100 mm and a 250 mm orifice plate meter under ideal flow conditions when fitted with 6 orifice plates with ~ ratios in the range 0.2 to 0.75. The fluids used were natural gas, air and water. In addition the effects of different pipe work installation geometries on the discharge coefficients were determined. The US programme, led by the American Petroleum Institute, determined the discharge coefficients of different meters with the same plate ~ ratio as the European programme but for pipe diameters ranging from 50 to 375 mm. In this case the fluids used were oil and water and only ideal flow conditions were employed. An equation developed as part of the European project has been accepted with a minor modification as the basis for the American Petroleum Institute's new standard and should form the basis of the next revision of the ISO standard. Additional work has also been undertaken in Europe to resolve anomolies associated with some of the US 50 mm data and to extend the data base to include the economically important case of 600 mm diameter meters such as those used for fiscal transfer of natural gas (see MTR 120). These and the outstanding data interpretation and uncertainties studies, including those of installation effects, should be completed by the end of April 1991.
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Coordinator
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