Horizontally Installed Differential Pressure Meter Wet Gas Flow Performance Review

摘要

It is important that the wet gas flow characteristics of the most popular wet gas flow meter type, i.e. the Differential Pressure meter, be fully understood. The NAM 4", Sch 80, 0.4 beta ratio Venturi meter tested with wet gas by Shell at Trondheim gave similar results when tested at the CEESI wet gas test loop. There was no evidence of facility bias or a liquid property effect between the different hydrocarbon liquids tested (i.e. diesel oil and decane). As NEL have shown that gas component does not have a significant effect on the wet gas over-reading this suggests that the different light hydrocarbon liquids did not have a significant effect on the wet gas over-reading. The de Leeuw wet gas correlation corrected the CEESI wet gas over-reading for a known liquid flow rate to within 2% with a few outliers which is the performance claimed by de Leeuw. The de Leeuw correlation worked well for the meter from which it was created. However, theoretical considerations suggest that large gas densiometric Froude number extrapolations of this correlation could possibly lead to errors as the value of the de Leeuw exponent does not converge on the theoretical value that is required by the homogenous flow model.