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Title: Field Experience In The Calibration Of Piston Provers
Author: Noemi Christina Hernandez, Valmir Ruis And Marcos Tadeu Pereira
Source: 2002 International Symposium on Fluid Flow Measurement
Year Published: 2002
Abstract: Custody transfer of liquid petroleum fluids is an important issue in the commercial relations inter companies, and the keystone subject is the metering station. Small errors could be responsible for enormous amounts of money transferred not correctly from sellers to buyers or vice-versa, and for this reason there is a permanent need for calibration, adjust and evaluation of the measurement quality of all custody transfer stations. In Brazil, which produces around 1 million barrels per day, an error of 0.2% in the fiscal metering (only the first metering) represents approximately US 20 millions per year. Unfortunately the actual figure of uncertainty is much higher than this. In almost all the custody transfer stations in Brazil ballistic or compact provers are used in the verification and calibration of the flow meters responsible for the measurement of liquid volume. These flow meters are normally turbine meters or positive displacement meters. The role of the provers is therefore crucial in the measurement chain, and it is necessary to know their error and uncertainty within stiff limits.

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