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Facts at your Fingertips: Flow Measurement in Large Lines, Ducts and Stacks

By Scott Jenkins |

Process industry plants install sophisticated air-pollution control systems, but they can be ineffective if the flowmeters on which they rely deliver inaccurate or unreliable data. This one-page reference provides information on measuring the flow of gaseous combustion products in large pipes, ducts and stacks. Flue products A flue is typically a large pipe, duct, stack, chimney or other venting apparatus attached to an industrial plant system, such as a boiler, furnace, steam generator or oven, through which waste gases are exhausted. Depending on a number of factors, including the type of industrial plant, process characteristics, fuel used and efficiency, fluegases can include the following compounds: CO2 CO CH4 N2 NOx O2 and H2O Ozone Sulfur oxides Particulate matter Environmental standards For large stack-monitoring applications, the U.S. Environmental Protection Agency (EPA) requires a continuous emissions monitoring system (CEMS) or rate monitoring system (CERMS). For CERMS, the flowmeters must perform an automated and on-demand self-checking of calibration drift (CD) at both a low-range and a high-range flow point. In the E.U., these systems are referred to as automated measuring systems (AMS). The flowmeters…
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