Why Flowmeter Calibration Sometimes Lacks Accuracy

摘要

(PGJ) - The oil and gas industry appears to be favoring a move toward using "newer" and more "advanced" flow measurement technologies, such as ultrasonic and Coriolis devices as an alternative to turbine and positive displacement meters. Coriolis flow meters offer the distinct advantage of providing a direct measurement of mass flow rate and product density with stated uncertainties as low as 0.05 for mass and 0.05 kg/m3 for density for light hydrocarbons, meaning measurements of gas and oil flow are highly accurate. The exact specification differs by meter manufacturer and model type. While the Coriolis forces for gas use are of a magnitude of three times smaller than in liquid use, a Coriolis flow meter can measure single-phase liquid or single-phase gas without any variation in model type.