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Title: Getting Rid Of The Prover, By Using A New Multipath Ultrasonic Flow Meter
Author: Dag Fllo, Equinor Pico Brand, Peter Van Brakel, Frode Endresen
Source: 2019 North Sea Flow Measurement Workshop
Year Published: 2019
Abstract: Metering systems with ball-provers are commonly used for loading/offloading of oil tankers. Such metering systems have significant cost, size, weight, and a considerable number of components. In this project, Equinor and KROHNE have cooperated on the testing of a new design multipath ultrasonic flow meter which is suitable for metering systems with master meter rather than ball-prover. The aims of this technology development project was to develop a master-meter system that: ?Has an uncertainty estimate which is about the same as that of a system with ball-prover ?Has considerably lower costs, size, and weight than a system with ball-prover To reach that goal, it was required to define a flow-metering run that would make the new ultrasonic meter independent of flow profile disturbances from upstream piping. Multiple tests were performed with different metering runs and different upstream pipe configurations. Following these flow profile disturbance tests, the flowmeter installed in the optimal metering run was calibrated and adjusted at one laboratory and verified by calibration on multiple liquids at 3 independent accredited laboratories.

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