A109 オリフィス下流における流れ加速型腐食の評価 : 2. 腐食速度の測定と流れ場の影響評価(配管減肉(FAC),OS6 保全・設備診断技術(1),一般講演,地球温暖化防止と動力エネルギー技術)

概要

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In this study, in order to evaluate the effects of flow field on corrosion rate due to flow accelerated corrosion (FAC), a corrosion rate downstream of an orifice was measured using the electric resistance method. The diameter of the pipe is 50 mm and that of the orifice is 24.3 mm, and flow velocity of the experimental loop was set at 5m/s, and the temperature of water was controlled within ±1 at 150deg-C. There were no significiant circumferential difference in measured corrosion rate,and the maximum corrosion rate was ovserved at 1D or 2D downstream from the orifice. The ratios of the measured corrosion rate and the caluculated wall shear stress at the 1D downstream from the orifice to the value at upstream under well developed flow agreed well.
2008-06-18