加圧消去法 (陽極効果による電食防止法) によるパイプラインの電食防止の設計手順と計算式

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  • Design Procedure and Simplified Calculation Formulas for Protection of Pipeline from Stray Current Corrosion Using Intentional Anode Field
  • カアツ ショウキョホウ ヨウキョク コウカ ニヨル デンショク ボウシホウ ニ

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The selective drainage method is the most common practice for protection of buried pipelines from stray current corrosion, but this method may give over-protection to the pipe along the long area of pipeline. The area that causes stray current corrosion in practice is often limited to the portion of several ten meters of the pipeline on both sides of a railway crossing. Therefore, in order to protect such a short portion of pipeline, it is advisable to eliminate the potential gradient existing around the railway by the use of a intentional anode, as discribed in the previous report.<br>This method has been found to be applicable to the stray current affected zone which is comparatively large as well as short.<br>In this report, simplified formulas for calculating the distribution of potential and current in soil are given, and fundamental procedures of the design of this method is discribed.

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