石油タンク底板裏面腐食の確率統計的研究　（第一報）　　（実タンクを対象とした連続面計測データを用いた実験的検討）:(実タンクを対象とした連続面計測データを用いた実験的検討)

概要

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The statistical analysis of back side metal loss on tank bottom plates was carried out by using the dataset measured with ultrasonic continuously thickness measurement devices. The relationship between the maximum depth of metal loss and the exceedance cumulative probability in log-log plot showed linear dependence on large metal loss region. The slope of this relationship indicated the degree of local corrosion generated in oil tank bottom plates. In this study, use of the relationship to assess the corrosion risk of oil tank bottom plates was proposed. The corrosion risk parameter derived from the relationship correlated with the actual corrosion rate obtained by the continuous thickness measurement dataset. For the practical point of views, authors showed the corrosion risk parameter can predict the maximum depth of metal loss, and it was effective information to maintain oil tank bottom plates safely. Furthermore, through the analysis with various dataset, the characteristic of corrosion generated in large scale tank bottom plates was different with that of small scale tank bottom plates.
一般社団法人日本高圧力技術協会の論文