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Title: Ultrasonic Meter Flow Calibrations Considerations And Benifits
Author: Joel Clancy
Source: 2004 International School of Hydrocarbon Measurement
Year Published: 2004
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 driven the demand for a new, more effective form of fiscal measurement. For most large volume custody transfer meter stations, ultrasonic flowmeters have become the new standard for fiscal metering. Many existing metering stations that use orifice measurement are replacing this with ultrasonic flowmeters. With added emphasis to improve overall measurement uncertainty, most users require flow calibrations prior to installing their ultrasonic flowmeters into their pipeline. Although AGA Report No. 9, Measurement of Gas by Multipath Ultrasonic Meters Ref 1, currently only recommends flow calibration for ultrasonic flowmeters, the next revision will require flow calibration for all ultrasonic 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? These areas, as well as others will be explored and considered.

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