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View Actual EPA Method 2D (PDF File)
EPA Method 2D:MEASUREMENT OF GAS VOLUME FLOW RATES IN SMALL PIPES AND DUCTS
Summary:All the gas flow in the pipe or duct is directed through a rotameter, orifice plate or similar device to measure flow rate or pressure drop. The device has been previously calibrated in a manner that insures its proper calibration for the gas being measured. Absolute temperature and pressure measurements are made to allow correction of volumetric flow rates to standard conditions.
Scope:This method is applicable for the determination of the volumetric flow rates of gas streams in small pipes and ducts. It can be applied to intermittent or variable gas flows only with particular caution.
Date Issued:9/25/1996