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Title: The Relative Merits Of Ultrasonic Meters Employing Between Two And Eight Paths
Author: Gregor Brown, Don Augenstein, Terry Cousins
Source: 2006 South East Asia Flow Measurement Conference
Year Published: 2006
Abstract: Ultrasonic meters based on the transit time principle have a number of recognised benefits relative to more traditional methods of flow measurement. In recent years a new generation of ultrasonic meters have emerged and the technology is now being widely accepted for custody transfer applications in the oil and gas industry. It is generally understood that improved meter performance can be achieved by employing more ultrasonic measurement paths. However, there are also practical and financial limitations to consider, and this will influence the decisions that the flow meter designers, buyers and users must make. It is not always obvious to the user or buyer of ultrasonic flowmeters what is to be lost or gained in terms of performance by decreasing or increasing the number of measurement paths. This is because the issues are complex are further confused by differences in competing designs. This paper provides a review of the influence of the number of paths, and path configuration, on the performance of transit time ultrasonic flow meters for oil custody transfer duties. The paper considers the importance of profile changes with both Reynolds number and with upstream pipe configuration. The data presented is taken from an analytical evaluation of various path configurations chosen to represent a range of meters that employ between two and eight paths. Where appropriate, experimental data has been included in support of the analytical results.

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