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Title: Different Meter Tube Requirements For Orifice Plates And Ultrasonic Meters
Author: Klaus Zanker
Source: Flomeko 2005
Year Published: 2005
Abstract: Orifice meters are built to rigorous standards that can achieve 0.5% uncertainty of the discharge coefficient (Cd) without the need for any flow calibration. This is achieved by relying on a vast array of empirical data collected in several test facilities over many years. The standards specify the orifice plate, the fitting, the pressure taps and the meter tube, to ensure that geometric and dynamic similarity is maintained with the empirical database.

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