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Title: Venturi-Tube Performance In Wet Gas: Computation And Experiment
Author: Michael Reader-Harris, David Hodges, Jeff Gibson
Source: 2007 South East Asia Flow Measurement Conference
Year Published: 2007
Abstract: Various one-off tests performed on wet-gas flowmeters appeared to show that changing the test fluids could affect the meter performance. It was believed that fluid properties, such as liquid surface tension and viscosity could play a major role however, no data existed that quantified the effects in a systematic manner. Quantifying the effect is important given the increasing use of wet-gas meters for gas and liquid allocation measurement. Knowledge of the extent of any change in meter performance is significant because current wet-gas correlations which correct for the liquid presence are not able to account for large changes in fluid properties. Many correlations in existence were developed on test facilities that utilize only a single pair of test fluids. Consequently, the use of such correlations on meters exposed to different fluids from those of the original test facility may well introduce systematic errors in the estimates of the individual-phase flowrates. In order to investigate this, TUV NEL carried out wet-gas testing of diameter ratio, , 0.6 and 0.75 Venturi tubes using three gas-liquid combinations (nitrogen-kerosene, argon-kerosene and nitrogen-water) and at two gas-liquid density ratios. These data were presented in 1 and 2. The results showed that changing the gas type had little measurable effect on the Venturi-tube performance with the largest deviations in over-reading relative to the nitrogenkerosene data not exceeding a range of -0.023 to 0.02, suggesting no effect of argon compared with nitrogen.

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