極値統計法による化学プラントの腐食評価法に関する研究

概要

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Extreme value statistical analysis has been applied for estimating corrosion loss of carbon steel pipes and tanks, in which leakaged due to corrosion was found. In the cases of erosion at elbows in sulfuric acid and corrosion at gas coolingtubes used for heat transfer, a good coincidence between the measured and the estimated depth by the extreme value analysis was acheved if the population of samples was divided into the following two groups : the heavil corroded are and the other area before the analysis. For oil tank plates which showed uniform corrosion with a constant corrosion rate, the population of sample could be analyzed as a whole and the return perild could be set as large as 10000. A grouping method was proposed for analyzing a large number of point data which were measured according to the Fire Service Act for oil tank base plates corroded by loal penetration of rain in the outside boundary.
社団法人日本材料学会の論文
1989-07-15