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The Effects of a Short‐Radius Elbow on Electromagnetic Flowmeter Accuracy

This study was conducted to show the effects that a short‐radius elbow has on electromagnetic flowmeter accuracy. Previous laboratory studies have shown that non‐ideal piping affects the accuracy of electromagnetic flowmeters. The results of this study indicated that many of the meters tested did not meet their own manufacturer's specified accuracy either in straight pipe or with the required straight pipe installed upstream of the meter and downstream of a short‐radius elbow. However, nearly all meters in this study were repeatable to within ±0.55% when installed in straight pipe. The results illustrate that when a magnetic flowmeter is to be installed in either straight pipe or piping with upstream disturbances, a laboratory calibration will improve the installed accuracy of the meter.