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Title: The Uncertainty Of A Waterdraw Calibration Vs. A Gravimetric Calibration On Small Volume Provers
Author: Gary Cohrs
Source: 2012 International School of Hydrocarbon Measurement
Year Published: 2012
Abstract: The focus of the API Petroleum Measurement Manuals is to reduce the uncertainty and improve the accuracy of all petroleum measurements. Many recent advances in weighing equipment and research and testing by various groups to improve volume calibrations have provided opportunities to greatly reduce the uncertainty and provide increased confidence in displacement Prover calibrations. API and NIST have standards on both volumetric and gravimetric techniques. The purpose is to review the history, techniques, similarities, advantages and disadvantages, and the uncertainty comparison between gravimetric and the traditional water draw method of Prover volume calibrations by NIST certified volumetric field test measures, focusing on high precision captive displacement flow Provers, known more commonly as SVPs. Groups, such as American Petroleum Institute Manual of Petroleum Measurements Chapter 4.9.4, and NIST SOPSVP15Nov-06 have defined standards for gravimetric displacement flow Prover calibrations

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