ASME STP-TS-084 PDF

ASME STP-TS-084 – Orifice Flow Coefficient Equation Comparison

This report analyzes four flange tap equations and three corner tap equations for the discharge coefficientfor orifice plates. All of the equations analyzed are functions of Beta Ratios, Reynolds Number, and LineSize, and all data points were evaluated against each of the seven orifice flow coefficient equationsdescribed in more detail herein. The goals of the study were to review the data available to determine whereany weak regions of the database may be, to provide a methodology for comparing the equations over arange of Reynolds Numbers, Line Sizes, and Beta Ratios, and to determine the performance of eachequation in relationship to the appropriate available database of calibration data.