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Title: Effect Of Entrained Liquid On Orifice Measurement
Author: V. C.Ting
Source: 1998 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1998
Abstract: This paper presents the results of a study to show that a small amount of liquid entrainment in an orifice meter can affect the accuracy of gas flow measurement. A series of tests, sponsored by Chevron Petroleum Technology Company, was conducted under controlled conditions at the Colorado Engineering Experiment Station, Inc., (CEESI) air flow calibration facility to study this effect. Eight-inch orifice meters were selected for the experiments. The tests were conducted at 600 psig over the orifice Reynolds number range from 4 to 9 million using two horizontally mounted orifice meters. Water was injected at a controlled rate upstream of the orifice meter to simulate field conditions. It was found that the presence of a small amount of liquid in the gas stream caused the orifice meters to read a lower gas flow measurement by as much as 1.7% depending on the beta ratio and the liquid rate. Field data results comparisons to laboratory data indicate that the field performance of orifice meters have higher metering errors than laboratory results. A wet and dry meter comparison field test conducted at Chevron showed that the wet gas measurement was approximately 3% lower than the dry gas meter.

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