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Title: Proving Coriolis Meters
Author: Marsha Yon
Source: 2008 International School of Hydrocarbon Measurement
Year Published: 2008
Abstract: Coriolis meters are in use throughout the hydrocarbon industry for the measurement of fluids including crude oil, products such as fuel oil, gasoline, and diesel, and light hydrocarbons such as natural gas liquids, propane, etc. When used for custody transfer, it is most often required by contract between the buyer and seller that the meter be proven in the field on the fluid that is being measured and at the conditions under which it will be operating. This paper will utilize the American Petroleum Institutes Manual of Petroleum Measurement Standards (MPMS) as the reference for industry practices for field proving methods and calculations. Coriolis meters can measure volume, mass and density. If the meter is used to measure volume and the pulse output represents volume, the meter should be proven as a volume meter. MPMS Chapter 4, Proving Systems, contains information specific to volumetric proving. If the meter is used to measure mass and the pulse output represents mass, the meter should be proven as a mass meter. Currently Chapter 4 does not contain information relative to proving on a mass basis however MPMS Chapter 5.6, Measurement of Liquid Hydrocarbons by Coriolis Meter, does provide guidelines for mass proving. If the density output is used for custody transfer flow calculations, the density measurement can be proven using MPMS Chapter 14.6, Continuous Density Measurement and a pycnometer or using MPMS Chapter 9, Density Determination and a hydrometer. The temperature output of a Coriolis meter is obtained from an internal RTD which is not inserted into the fluid and thus does not meet MPMS Chapter 7, Temperature Determination requirements and should not be used for custody transfer calculations. This paper will attempt to combine information from these standards with field experience to provide an overview of what to expect when proving a Coriolis meter and what to look for if the proving results are not satisfactory.