マルチセンシング差圧伝送器による空気ラインにおける導圧管の詰まり診断(<特集>D&D 2008)

概要

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Differential pressure transmitter with an orifice is widely used as a major field flowmeter. A major drawback of this flowmeter at operation site is blockage of an impulse line, which connects a differential pressure transmitter with an orifice tap. By conducting experiments at a water line, the diagnostic method based on the pressure fluctuations in the impulse line can diagnose the blockage in the steady state. However, there is a possibility of making a wrong diagnosis in the transient state in this method. This paper investigates the cause of this problem by comparing the experimental results at an air line with at the water line. In addition, the effectiveness of a diagnostic method based on the phase difference between orifice upstream and downstream pressures is clarified even in the transient state. Through experimental investigations, the following results are derived: 1) The long-term pressure change has a harmful effect to diagnose the blockage with the pressure fluctuations. 2) The diagnostic method based on the phase difference can diagnose the blockage even in the transient state; however, this method can not diagnose the severe blockage in an air line. Therefore, the method based on phase difference has to be improved.
社団法人日本機械学会の論文
2009-05-25