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Title: WET GAS TEST COMPARATIVE RESULTS: ORIFICE VS. USM
Author: John Lansing, Toralf Dietz, Dr. Richard Steven, Jim Bowen
Source: 2022 Appalachian Gas Measurement Short Course
Year Published: 2022
Abstract: The CEESI Nunn Wet Gas facility consists of a closed- loop test stand with up to 650 horsepower that permits flow rates from about 83 to 620 ACMH. This corresponds to 3 to 23 m/s in 4-inch Schedule 80 piping. Pressures can range from 1,380 kPa up to 7,500 kPa (13.8 Bar - 75 Bar). Gas flow is measured using a calibrated 6-inch turbine meter, and the injected liquid is measured using one of 2 different Coriolis meters (1/2 and 2 sizes). The liquid typically used is Exxsol D80, but water, or a mixture of both can also be used. The first test involved a 4-inch dual-chamber orifice meter with the gas USM were installed in series. The second test incorporated a 3-inch dual-chamber orifice and 2-path USM, both in series. In both cases the USM was located upstream to minimize, if not totally eliminate, any affect on the orifice meter. In order to ensure that the flow profile is as realistic as possible to what would be seen in the field, the non-intrusive USM was located upstream of the orifice meter.

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