MEASURING FLOW IN A PIPE

摘要

72424-2 MEASURING FLOW IN A PIPE A Gradiomanometer (trade-mark) measures the difference in pressure between points 3 and 4 to indicate density and hence proportions of two phases (e.g. liquid and gas), each of known density flowing as indicated by arrow 6. A venturi meter 2 measures the difference in pressure between points 4 and 5 to indicate flow rate, initially assumed to be that of the heavier phase only. An iterative calculation makes it possible to obtain a density measurement corrected to allow for flow friction and individual flow rates of the two components, having regard to slippage therebetween. A step discontinuity 8 may be provided downstream to create turbulence and render the flow homogenous.