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Title: Proving A Fiscal 5-PATH Ultrasonic Liquid Meter With A Small Volume Ball Prover. Can It Be Done?
Author: Trond Folkestad
Source: 1999 North Sea Flow Measurement Workshop
Year Published: 1999
Abstract: Norsk Hydro is installing its first fiscal liquid metering station based on Ultrasonic meters on the Oseberg Sr (South) platform comprising two multi-path Ultrasonic liquid flow meters in series with an Unidirectional small volume ball prover. The Ultrasonic liquid flow meters are 8 Krohne 5-path Altsonic V meters while the 12 Unidirectional ball prover is a Kongsberg Offshore design. During flow testing of the metering system the required repeatability during proving could not be achieved. The repeatability during proving varied between more than ten times the requirement in the regulation from the Norwegian Petroleum Directorate (NPD) to just within the requirement. Most of the time varying between three to six times the requirement. This paper will share the experience gained during flow testing the metering system for four months in Brevik, Norway. The paper will conclude with a recommendation for better test set-up and system design when using this type of Ultrasonic liquid flow meters with a small volume ball prover.

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