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Title: Theoretical Uncertainty Of Orifice Flow Measurement
Author: Zaki D. Husain
Source: 1994 International School of Hydrocarbon Measurement
Year Published: 1994
Abstract: Orifice meters are the most common meters used for hydrocarbon flow measurement. They are rugged and mechanically simple devices that are suited for flow measurement in the field. In 1779, an Italian physicist, Giovanni B. Venturi (1746-1822) performed the first recorded work that used orifices for the measurement of fluid flow. Many years of field experience with a wide range of meter sizes, variety of fluids, and numerous investigative tests have identified all major contributing factors of the measurement uncertainty of orifice flowmeters. Because of their long history of use and dominance in the fluid flow measurement, their designs, installation requirements, and equations for flow rate calculation have been standardized by different organizations in the United States and in other countries. These standards provide the guideline for the users to achieve accurate flow measurement and minimize measurement uncertainty. This paper discusses different factors that contribute to the measurement inaccuracy and provide an awareness to minimize or eliminate these errors. Different standards on orifice flowmeters and measurement uncertainties are referenced Ref.1-7.