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Title: Considerations On The Influence Of Deposits Or Changes In Wall Roughness On The Validity Of The Calibration And Long Term Accuracy Of Ultrasonic Gas Flow Meters
Author: Thomas Horst, Alexander Jakschik, Toralf Dietz, Henk Riezebos, Volker Herrmann
Source: 2011 North Sea Flow Measurement Workshop
Year Published: 2011
Abstract: Due to refined diagnostic capabilities and the lack of moving mechanical parts, ultrasonic flow meters (USMs) provide excellent reliability and long-term stability. These properties lead to high accuracy and low costs of operation in the field. Recent studies 2 have shown how meter performance changes after electronics or transducers are replaced. This demonstrates the high precision of time-of-flight measurement with up-to-date components. Nevertheless,some installation parameters relevant to meter accuracy may change after a long period ofoperation. For instance, in many situations in the field, inner pipe wall corrosion andcontamination can occur. These pollutions of the inner pipe wall may influence thegeometrical parameters and/or wall roughness of the pipe and consequently the shape of theflow profile.

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