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Title: Flow Calibrating Ultr Asonic Gas Meters
Author: Joel Clancy
Source: 2014 International School of Hydrocarbon Measurement
Year Published: 2014
Abstract: the primary method for custody transfer measurement has traditionally been orifice metering. While this method has been a good form of measurement, technology has driv en the demand for a new, more effective form of fiscal measurement. Ultrasonic flowmeters have gained popularit y in recent years and hav e become the standard for large volume custody transfer applications for a variety of reasons. Most users require flow calibrations to improve meter performance and overall measurement uncerta inty. The latest revision of AGA Report No. 9, Measurement of Gas by Multipath Ultrasonic Meters , Second Addition Ref 1, now requires flow calibration for ultrasonic flow meters when being used for custody transfer applications. 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 dia gnostic capabilities inherent in an ultrasonic meter? These areas, as well as others will be expl ored and considered.

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