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Title: How to give specifications of a flow meter in a precise and useful way
Author: Kjell-Eivind Frysa
Source: 2021 North Sea Flow Measurement Workshop
Year Published: 2021
Abstract: Flowmeters are essential parts of a metering station for custody transfer measurements of oil and of natural gas. Such measurements have a large focus from operator, partners, customers, transporters and authorities, because of the large monetary values involved. It is therefore critical to ensure that the flow meters are of a type with expected performance, and that the flow meters are maintained and operated as they should. As an example, the Measurement Regulations of the Norwegian Petroleum Directorate 1 specify uncertainty limits at 95 % confidence level for oil metering for sales and allocation purposes of 0.30 % of standard volume. For gas metering for sale and allocation purposes the similar limit is 1.0 % of mass. In order to document compliance with such uncertainty requirements, a combination of flow meter specifications, calibration results and field data are used, in addition to uncertainty from other instruments like pressure and temperature measuring units and online gas chromatographs.

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