The differential pressure generated before and after the throttling device is determined by the working state parameters of the gas flowing through the throttling device. When deriving the indication correction formula, attention should be paid to three working state flow rates: the design state flow rate, that is, the artificially set working state flow rate; the working state flow rate flowing through the throttling device, that is, the actual flow rate in the pipeline; the detected working state flow rate, that is, the detected uncorrected differential pressure representative flow rate, which is the most critical of the three. The differential pressure flowmeter dry gas flow detection and indication correction formula is analyzed by graphical method. This formula can also be used to correct the indication of differential pressure flowmeters such as nozzles, Venturi tubes, Annubar, Willabar, elbows, etc. Keywords: differential pressure flowmeter, throttling device, flow, correction
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