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The most widely used method for determining the moisture content in flue gas is the EPA Method-4 method. While applying this method, a gas sample is taken at a constant rate from the chimney, moisture is removed from the sample stream and determined volumetrically or gravimetrically.
The EPA Method-4 method mainly includes two procedures. With the reference method, for example, when there is a need to calculate emission data, the moisture content in the flue gas is determined precisely and absolutely. The other method approximation method is used to estimate the moisture percentage in order to adjust the isokinetic sampling rate before the pollutant emission measurement study. The approach method is only a suggested method. Other methods are also accepted for estimating moisture content, such as drying tubes, condensation techniques, condensation techniques or previous experience.
The reference method is mainly applied at the same time as a pollutant emission measurement study. In this case, the isokinetic percentage, pollutant emission rate and similar calculations are based on the reference method or the results of its equivalent.
