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Title: Flowrate Measurements Using Pitot Tubes To Measure Emissions In Circular Ducts
Author: Dr Michael Reader-Harris
Source: 2012 International Symposium on Fluid Flow Measurement
Year Published: 2012
Abstract: Pitot tubes are commonly used to measure gas flows arising from stack emissions. It is clear from data collected in the 1960s and 1970s that under controlled conditions Pitot tubes can give excellent results. However, it is expected that results in stacks will have much less good accuracy. The way to investigate the difference is to examine the uncertainty of the measurements. Section 2 gives the results from the earlier work. In Section 3 and following the requirement is to identify and assess the sources of uncertainty in the application of Pitot tubes to measurement of gas flows in stacks to monitor emissions. This paper gives numerical values to uncertainty that are intended to be typical. They are not necessarily the best values that could be obtained, but will enable it to be easily seen where the main sources of uncertainty are

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