In the quantitative risk assessment(RBI)process of atmospheric storage tank bottom plates,the selection of bottom plate corrosion rate will affect the determination of the overall risk level of the storage tank.Based on the Weibull extreme value distribution theory,the Weibull distribution parameters were calculated using the best linear unbiased estimation(BLUE)method for the edge plates of storage tanks;For the middle plate of the storage tank,the Weibull distribution parameters were calculated using the simple linear unbiased estimation(GLUE)method.Subsequently,the corrosion rates of the edge plate and the middle plate were calculated using linear regression theory,and they were assigned as expert values for corrosion rates to perform RBI calculations on the bottom plate of the storage tank.The results indicate that the Weibull extreme value distribution theory calculation can scientifically and reasonably estimate the corrosion rate of the tank bottom plate.The corrosion rate of the edge plate is 0.133 mm/a,and the corrosion rate of the middle plate is 0.095 mm/a.The error with the theoretical algorithm corrosion rate is 3.6%,and the risk level of the tank bottom plate is medium to high risk.This to some extent solves the problem of selecting the corrosion rate in the tank RBI calculation process,This can provide certain technical support for the evaluation work of RBI in future inspection and testing institutions.
关键词
常压储罐/风险评估/腐蚀速率/威布尔极值分布/最佳线性无偏估计/简单线性无偏估计
Key words
atmospheric storage tank/risk assessment/corrosion rate/weibull extremum distribution/best linear unbiased estimation/good linear unbiased estimation
维普
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