Metering Performance Investigation and Substantiation of the “Universal Venturi Tube” (U.V.T.): Part 1—Hydraulic Shape and Discharge Coefficient

Abstract

The UVT provides Classical Venturi tube type metering performance with less than half the laying length, no annular chambers, and about half the permanent head loss. Data presented reveal the flow mechanism inside the tube and substantiate its performance over a wide range of Reynolds numbers, line sizes, beta ratios, tube materials, upstream and downstream piping configurations for incompressible and compressible flow. The experience of the past five years indicates ± 0.5 percent two times standard deviation uncalibrated accuracy for C.I. UVT’s. Due to its depth and method, the substantiation work was unique; consequently, it is recommended as a standard procedure for the performance substantiation of any kind of flow meter presently in use or to be introduced in the future.