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Title: Effect Of Liquid On Orifice Meter Measurement Accuarcy In High Pressure Natural Gas
Author: R.K. Mcbrien
Source: 1999 International Symposium on Fluid Flow Measurement
Year Published: 1999
Abstract: The effects of low liquid (ethylene glycol) loads on orifice metering of high pressure (4600 to 5000 kPa) natural gas has been examined for three different orifice beta ratios (b), 0.31, 0.60 and 0.69. Using orifice flow correlations developed for dry gas flow, a measurable meter shift (MS) in predicted gas flow rate from dry gas conditions has been observed for liquid to gas mass ratios (z) ranging from 0.25 to 6.0 %. The magnitude and direction of the observed shifts varies with z, meter gas flow Reynolds number, Reorf (2.8x106Reorf11x106) and b. The greatest positive shifts (up to 1.4%) occurred for the larger values of z (2%) and the lower values of b. For z 2% and b of 0.60 and 0.69, MS was initially negative (as low -0.7%). The results observed in this work agree with trends from earlier work reported in the literature, done with different liquid/gas combinations and pressure ranges. The reason for the observed shifts has been speculated but at this time more research is needed to confirm if these speculations are correct. Flow visualization would be an important next step to enhancing the evaluation of these phenomena.

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