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Title: Further Evaluation Of The Performance Of Horizontally Installed Orifice Plate And Cone Differential Pressure Meters With Wet Gas Flows
Author: Richard Steven, Gordon Stobie & Andrew Hall
Source: 2008 South East Asia Flow Measurement Conference
Year Published: 2008
Abstract: Orifice meters have been studied for many years and their performance in single phase flows is well documented in the standards 1. Between 1967 and 1977 Chisholm 2,3 researched the response of orifice meters to two phase flow. No further research on the behaviour of orifice meters in wet gas flows was released until 2007, when Hall et al 4 and Steven et al 5,6,7 showed data from CEESI that indicated Chisholms equation 3 was appropriate for predicting the over-reading of an orifice meter in wet gas flow conditions, across a significant range of the flow conditions tested. Only at very low or high gas velocities (or gas densimetric Froude number) did Chisholms equation become inaccurate. In 2005 Steven 8 summarized the research into cone meters in wet gas flow. Stewart et al 9 had shown that cone meters had a performance in wet gas flow that was sensitive to the beta ratio, where this has been found to not be a very significant issue with orifice meters, as shown by Steven 5. Since most available cone meter data is for a 0.75 beta ratio, the wet gas over-reading correlation for the cone meter, Steven 8, is specific to this beta ratio. At the 2007 North Sea Flow Measurement Workshop, two papers, Evans et al 10 and Steven 11, showed that the published 0.75 beta ratio cone meter correlation was seen to diverge and become inaccurate on extrapolation to higher gas velocities than the data set for which the correlation was derived.

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