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Title: Gri Plans For A Meter Research Facility
Author: K. m. Kothari, R. S. Norman
Source: American Gas Association 1987
Year Published: 1987
Abstract: The increasing need for technical information on gas metering accuracy, performance parameters, and system effects has produced a number of research programs in recent years both in the United States and Europe. Major programs dealing with the performance of orifice meters have been developed by the European Economic Community (EEC), the American Petroleum Institute (API), and GRI. Although the results of these programs are not yet fully analyzed, they are expected to improve gas measurement accuracy at custody transfer stations. However, it has been recognized that many metering R&D questions still remain. For orifice meters, additional testing will be required to include larger meter tube diameters, high Reynolds numbers, and the sensitivity of coefficient data to parameters such as flow asymmetries, system effects, tube roughness, etc. Current facility limitations do not permit experimental programs to address these problems. Uncertainties can be caused by nonideal flow conditions, such as pulsations, swirl, and profile distortions due to flow conditioners that can occur at field installations. These so-called systems effects have historically resulted in differences between metering accuracy achieved under laboratory conditions and metering accuracy achieved in the field.

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