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Title: Dirty Vs. Clean Ultrasonic Gas Flow Meter Performance
Author: John Lansing
Source: 2002 International Symposium on Fluid Flow Measurement
Year Published: 2002
Abstract: The use of ultrasonic meters (USMs) for natural gas custody applications during the past few years has increased at a remarkable rate. The growth rate increased after the publication of Measurement Canadas PS-G-E-06 Provisional Ultrasonic Specification Ref 1 and AGA Report No. 9, Measurement of Gas by Multipath Ultrasonic Meters Ref 2 in June of 1998. The many benefits of USMs have been well documented over the past few years Ref 3. With the increased population of USMs in the gas industry, many users are asking more questions about this technology. One of the issues often inquired about is the performance (accuracy) of an ultrasonic meter once the internal surface changes from the original clean calibrated condition. The accuracy of all metering devices is affected when less-than-clean, pipeline quality gas contaminates the inside of the meter, the associated piping and flow conditioner. The impact on an ultrasonic meters performance is generally thought to be less than traditional metering technologies, but little data has been published to date. Dirty versus clean meter comparisons have been conducted in the past on other types of primary meters such as orifice and turbine. As one would expect, a meters accuracy changes when it is subjected to a buildup of pipeline material such as oil, grease and mill scale. Users are now asking for results on USMs when they are subjected to these conditions. This paper discusses how the performance of an ultrasonic flow meter is impacted when it is subjected to dirty natural gas.

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