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Title: Master Meter Prover Certifications Per API Mpms 4.9.3
Author: Scott P. Iverslie
Source: 2012 International School of Hydrocarbon Measurement
Year Published: 2012
Abstract: The basis for accurate metering of hydrocarbon liquid is directly related to the calibrated volume of the displacement prover used to prove the meter and determine the applied meter factor. Any error introduced during prover calibration results in the same error being applied to the meters being proved. Depending on the volume of the metering system, just a small error can add up to thousands of dollars being lost (or gained) very quickly. Prior to mid 1970, the only accepted practice for prover calibration was the Waterdraw Method found in the American Petroleum Institute (API) Manual of Petroleum Measurement Standards (MPMS), Chapter 4, Section 9, Part 2. Confidence in the accuracy of this method was accepted and promoted by the experts in the oil industry. With the advent of the Trans Alaska Pipeline System (TAPS) in 1977, it became evident that the Waterdraw Method of prover calibration could be very difficult and expensive to perform on TAPS. With the large prover volumes, the number of provers in the system, the remote locations, the availability of equipment and resources for cleaning, the difficulty of disposing large volumes of contaminated water and the desired frequency of calibration all posed significant challenges

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