토양특성이 상수도관의 외부부식에 미치는 영향 평가

초록

The goal of this study is to present an external pit corrosion rate(pecr) model with considering both the age of pipe and the soil characteristics. The correlation of nonlinear exponential model among conventional empirical models was a little higher than other empirical models in the prediction of pecr according to the age of pipe. However, there has been a limit to predict pecr with the model by using only a pipe age since installation as a variable. The soil analysis results from sixty nine samples showed that all of the samples were non corrosive in the assessment of ANSI/AWWA scoring system. The correlation of soil corrosion factors and pecr was also low. The application result of linear and nonlinear regression models that soil characteristics only showed a low correlation with pecr. Proposed nonlinear regression model in this study, with considering both the age of pipe and the soil characteristics, showed a little higher correlation(R2=0.46) than conventional model.

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