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Title: Operation Of Ultrasonic Flow Meters At Conditions Different Than Their Calibration
Author: William Freund, Klaus Zanker, Dale Goodson, James E. Hall, Andrew W. Jamieson
Source: 2002 North Sea Flow Measurement Workshop
Year Published: 2002
Abstract: Currently, calibration of an ultrasonic flow meter for natural gas measurement is conducted under the conditions available at the flow calibration facility. Since almost all of these facilities utilize natural gas flowing in a pipeline, it is usually not possible to vary parameters such as temperature, pressure and gas composition, each of which affect the speed of sound. When the ultrasonic meters are then used in applications where these parameters are different from their calibration values, does the calibration still apply? In order to quantify the effect of changes in these parameters on the calibration of ultrasonic meters, a series of carefully controlled calibrations have been performed.

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