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.Ultrasonic flowmeters have gained popularity in recent years and have 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 uncertainty.Although AGA Report No.9,Measurement of Gas by Multipath Ultrasonic Meters [Ref 1],technically does not recommend flow calibration for ultrasonic flowmeters,the next revision will likely do so for all ultrasonic custody transfer applications.
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