The Kalibra prgram developed by Ruhrgas is a numericla tool for predicting measurement uncertainties of ultrasonic flowmeters in disturbed flows,Inputs requried include a reference flow field (normally the ideal flow field in which a meter is calibrated),a disturbed flow condition (e.g. behind bends,valves,etc.) and the meter's sound path configuration.based on these inputs,"measurement" errors of ultrasonic flowmeters caused by flow disturbances cna be predicted numerically.this ppaer investigateds the results of different disturbances generated in a double bend out of plane for four different ultrasonic flowmeters.Artificial flow ocnditions are used to determine the impact of swirl,profile deformation and decay on meter accuracy in separate steps.Teh effects of changing hte meter's angle of installiatin in the pipe are also examined.
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