当乙醇与汽油混合后，乙醇燃料会腐蚀管道。
Ethanol fuel does corrode existing pipelines when mixed with gasoline.
采用改进的一次二阶矩法对腐蚀管道的可靠性指标和失效概率进行了分析和计算。
The advanced first order and second moment iterative method are employed for calculation on reliability index and failure probability.
计算表明，当热流处于稳定状态时，局部腐蚀管道所能承受的内、外壁增温差为最小值。
Calculation showed that when the heat flow is in steady state, temperature-increasing difference in inner, outer pipe walls bearable for partial corrosive pipeline represents a minimum value.
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