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Title: Mass Meters For Liquid Measurement
Author: Simon Garner
Source: 2004 International School of Hydrocarbon Measurement
Year Published: 2004
Abstract: The type of mass flowmeter most commonly used for liquid petroleum measurement applications is the Coriolis principle meter. Patents for Coriolis devices date back to the 1970s and since that time the market has expanded rapidly. It is expected that within the next 5 years Coriolis meters will be established as one of the top 3 metering technologies, along with differential pressure and magnetic flowmeters. The feature of Coriolis meters which makes them so versatile is that they measure mass flow directly and independently of the physical properties of the fluid such as viscosity, temperature or density. They also exhibit metrological performance unmatched by volumetric flowmeters with better than +/- 0.15% accuracy. This performance and the ability of Coriolis meters to lend themselves to a wide variety of applications and fluids fuelled their rapid adoption by the measurement community. Traditionally initial cost has been high, but when correctly selected and installed Coriolis meters have proven to be cost effective and an excellent choice for both mass flow and density measurement. No longer regarded as a high tech, high end solution, newer models are replacing Positive Displacement meters in applications in the Chemical, Food and Pharmaceutical sectors. The Petroleum Industry globally has extensive experience with Coriolis mass flow and many companies are using and continuing to evaluate Coriolis meters. To gain maximum benefit from applying mass flowmeters, the end user must know the relative advantages over other technologies. They must be aware of how the meters can provide value over the lifetime of the equipment, taking into account purchase, installation, operation and maintenance considerations. An ever-expanding variety of products are available and users should be aware of the features offered and relevance to the application. To this end the paper will introduce the theory of operation behind Coriolis meter design and how the mass flow rate measurement is made. What mass flow meters can do and what to look for when selecting an instrument. Applications of the technology in the Petroleum Industry are described with reference to the special benefits mass meters offer. Installation is critical to effective measurement performance and the key points from manufacturers experience are explained. Effective meter proving confirms the accuracy of the instrument during its operating life. Mass and volumetric proving methods are discussed.

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