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Title: Effect Of Contamination On Ultrasonic Metering Accuracy
Author: Adam G. Hawley Terrence A. Grimley
Source: American Gas Association 2013
Year Published: 2013
Abstract: Ultrasonic meters are known to be affected by the buildup of material inside the meter and surrounding pipe and flow conditioners 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. Over the past several years, the Pipeline Research Council International (PRCI) has funded a number of projects related to the effect of contamination on measurement performance. This paper summarizes the various experimental studies that have isolated the effects of contamination on the upstream piping and flow conditioner and on the meter. Testing with commercially-available multipath ultrasonic flow meters has revealed that meter path-velocity ratios are an effective diagnostic of material buildup in various locations and that cleaning efforts should focus on ensuring the cleanliness of the meter

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