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Title: Velocity Profile Measurement In An Orifice Meter Calibration System For Natural Gas
Author: J. J. S. Shen, V. C. Ting
Source: 1986 International Symposium on Fluid Flow Measurement
Year Published: 1986
Abstract: This paper presents some of the results of an orifice research project regarding the system effects on the accuracy of orifice metering. Experiments were conducted on Chevrons natural gas flow calibration facility in Crane, Texas. Three aspects of the flow system that may influence measurement results are studied: velocity profiles were measured using directional pitot probes at metering location, pressure transducers stability was examined over time and for varying temperature, and comparisons were made of orifice meters operating alone and in series with an upstream meter. In comparative calibration tests, a bank of critical flow nozzles was used to determine the reference flow rate. Experimental results have verified that the base case of a fully developed flow with no interference between meters was achieved in the calibration facility. This study ensures proper entrance conditions and accuracy of measurements in future work.

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