The objective of this study is to examine the American Society of Mechanical Engineers (ASME) Long Radius Flow Nozzle. This study was conducted with regard to published standards for design and installation, manufacturing, and the comparative analysis of laboratory flow calibrations to the theoretical predictions of the coefficient of discharge. Several sets of identically designed Long Radius Flow Nozzles were manufactured and laboratory flow calibrated. The results of the flow calibration data were used to evaluate the accuracy of the prediction equations for the Coefficient of Discharge and to determine the effects of materials and manufacturing processes such as post weld stress relieving. Preliminary results of continuing research indicate that the uncertainty of the coefficient of discharge may be 1% or less while the published uncertainty is 2%. These results indicate that well controlled design and manufacturing processes influence the flow nozzle performance. These results are based on flow calibration data from an independent laboratory. In conclusion, the long radius flow nozzle can be designed and manufactured so the uncertainty associated with the coefficient of discharge is less than published values. Further study is required of the published equations for predicting the coefficient of discharge.

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