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Title: Quantification Of The Effect Of Dirty Upstream Pipe On Ultrasonic Meter Performance
Author: Terrence A. Grimley
Source: American Gas Association 2009
Year Published: 2009
Abstract: Ultrasonic meters are known to be affected by the buildup of material inside the meter and surrounding pipe due to common pipeline contaminants. The buildup affects the metering accuracy by reducing the flow area sampled by the ultrasonic transducers and by changing the shape of the velocity profile through the creation of additional roughness elements on the pipe wall. For this study, commercially-available multipath ultrasonic flow meters were installed downstream of piping with various levels of simulated dirt buildup with measured surface characteristics. Over the range of buildup described in this paper, there were no significant shifts in the measurement accuracy however, changes in the condition of the upstream pipe were detectable via a ratio of meter path velocities.

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