Orifice Meter Diagnostics – Predicting the Magnitudes of Flow Prediction Biases

R Steven, K Lewis

Abstract

With most modern flow meters there is a drive to equip the meter with a comprehensive verification system driven by a diagnostic suite. A diagnostic suite is a collection of different individual diagnostic checks grouped together to collectively offer more information. The state of the art is to use these diagnostic suites to show if the meter has a problem, and if so then use diagnostic suite pattern recognition to try to identify the source of the problem. However, there is virtually no R&D published that goes on to then try and predict the associated flow prediction bias induced by that identified malfunction. One such orifice meter diagnostic suite (commonly called ‘Prognosis’) is based on pressure field analysis. In this paper the development of Prognosis to show a problem exists, identify the source of the problem, and then predict the associated flow prediction bias is discussed.

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IMEKO TC

TC9 - Flow Measurement

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