C217 オリフィス下流における流れ加速型腐食の評価 : 4. 腐食速度に与える流速の影響評価(配管減肉評価法(2),OS5 保全・設備診断技術),動力エネルギーシステム部門20周年,次の20年への新展開)

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 the temperature of water was controlled within ±1 at 150deg-C. In order to evaluate the dependence of FAC rate on flow velocity, we carried out the two series of measurement. During each measurement period, we changed flow velocity condition from 1.4 to 5.0 m/s, or from 2.1 to 3.5 m/s. In these results, FAC rates downstream of the orifice increased remarkably by increasing the flow velocity. However the changes of FAC rates upstream were little. And the maximum FAC rates downstream of the orifice were proportional to Re^<0.51> except for that of 1.4 m/s.
一般社団法人日本機械学会の論文
2010-06-20