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Title: FLOW CALIBRATING GAS ULTRASONIC METERS - CONSIDERATIONS AND BENEFITS
Author: Joel Clancy
Source: 2022 American School of Gas Measurement Technology
Year Published: 2022
Abstract: Ultrasonic meters (USMs) have become widely used custody transfer meters for gas transmission and distribution measurement systems. USMs have taken the place of measurement stations that have historically utilized orifice metering. While orifice metering has been a good form of measurement, technology has driven the demand for a new, more effective form of fiscal measurement. USMs are not only being installed in new measurement stations but are also being used to upgrade/retrofit legacy orifice metering stations. For all custody transfer applications, users require flow calibrations to improve meter performance and overall measurement uncertainty. The latest revision of AGA Report No. 9, Measurement of Gas by Multipath Ultrasonic Meters, Fourth Addition Ref 1, requires flow calibration for ultrasonic flow meters when being used for custody transfer applications. Some users will also still choose to flow calibrate USMs that are installed in non-custody applications, but where accurate measurement is still critical. What considerations then, should be taken when choosing to flow calibrate an ultrasonic flowmeter? What are the benefits to the user? What should a user expect from a flow calibration? What kind of performance should the customer expect or accept from an ultrasonic meter? What are the diagnostic capabilities inherent in an ultrasonic meter? These areas, as well as others will be explored and considered.

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