Q235B消防水管道泄漏原因分析

Leakage Cause Analysis of Q235B Fire Water Pipeline

为了研究某Q235B消防水管道泄漏原因,利用宏观检查、理化性能分析、能谱分析等对泄漏管段进行了检验和分析。结果显示:泄漏部位位于钢管外表面冷缠带及环氧涂层脱落处,主要表现为簇状分布的腐蚀坑;管材化学成分、拉伸性能、压扁试验结果满足相关标准要求;管体金相组织均为铁素体+珠光体,组织未见异常;腐蚀坑附近腐蚀产物中主要含有Fe、O、Si、Ca及少量Cl。分析表明,管道泄漏是因为钢管表面冷缠带及底漆脱落,导致钢管金属基体与土壤介质接触,从而产生局部腐蚀及穿孔。

In order to investigate the leakage cause of Q235B fire water pipeline,the leakage pipe section was tested and analyzed by means of macro inspection, mechanical properties testing and chemical analysis and EDS analysis. The test results showed that the leakage point was located at the place where the cold-tangled belt and epoxy coating fall off,and distributed in clusters corrosion pits. The chemical composition, tensile properties and flattening test results meet the requirements of relevant standards. The metallographic structure of the pipe body is ferrite + pearlite. The corrosion products near the pit mainly contain Fe, O, Si, Ca and a small amount of Cl. The analysis indicates that the leakage of the pipe is caused by the peeling of cold-tangled belt on the surface and primer, which leads to the contact between the metal base of the steel pipe and the soil medium, resulting in local corrosion and perforation.