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Title: Eliminating Elbow Flow Turbulences From Metering Piping Systems
Author(s): [Not Available]
Source: 2009 International Symposium on Fluid Flow Measurement
Year Published: 2009
Abstract: Flow turbulence caused by piping elbows can cause cavitation, vibration, flow separation, two-phase flow, erosion and corrosion in piping systems. When this flow turbulence reaches a flow meter, it can lead to damage to the flow meter and inaccurate flow meter measurements. Most meter measurement inaccuracies can be traced directly to the flow turbulence created by the last piping elbow located close to the inlet side of the meter. Good piping design states that there should be at least 10 to 30 diameters (depending on the meter?s inlet piping diameter) of straight pipe after the elbow and before the meter, to eliminate the flow turbulence created by the elbow. In almost all cases, there is not enough room for a 10 to 30 diameter straight run of pipe between the elbow and the meter. A set of stationary rotation transformation vanes located before the elbow will eliminate the centrifugal effect of the elbow flow and make the elbow flow behave as if the elbow wasn?t there, turning the elbow into the equivalent of a straight length of pipe. The stationary vanes will create uniform controlled flow stream lines inside the piping elbow, removing the requirement for the 10 to 30 diameter straight length of pipe. The controlled elbow flow stream lines have been demonstrated effectively for sometime. This paper brings this technology to the metering industry. This paper will provide actual elbow flow measurements, numerical simulation results, and a laboratory demonstration.

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