埋地输油管道直流排流保护技术应用

随着电气化铁路建设的飞速发展,干扰电流对埋地输油管道的干扰腐蚀越来越普遍。干扰电流包括直流干扰电流、交流干扰电流和地电流等3类,其中直流干扰电流对输油管道的干扰腐蚀最为严重。分析了直接排流、极性排流、强制排流和接地排流等4种直流排流技术的工作原理、特点及适用范围,结合输油管道的设计背景及电位测定,在不影响电气化铁路正常运行的情况下,选择接地排流保护措施。计算确定了输油管道的排流保护参数,并在输油管道平行电气化铁路区间设置6组直流干扰电流排流点和9组牺牲阳极。埋地输油管道经开挖检测,管道绝缘防腐层完好,未发现明显的直流干扰腐蚀现象,取得了较好的直流排流效果。

Application of DC Drainage Protection Technology for Buried Oil Pipeline

The influence corrosion of influence electrical current is very universal to buried oil pipeline along with the rapid development of electric railway construction.There are three kinds of influence electrical current,namely,DC influence current,AC influence current and earth current,in which the influence corrosion of DC influence current is most serious to the buried oil pipeline.This paper analyzes the working principle,features and applicability of the direct drainage,the polarity drainage,the forced drainage by grounding.The drainage by grounding is adopted according to the design background and electrical voltage measure.The drainage protection parameters of the buried oil pipeline are calculated,and six groups of DC drainage and nine groups of sacrificial anode are installed along the buried oil pipeline.The insulated coating layer of the pipeline is in good condition by digging detection.There is no obvious DC influence corrosion and there is a good effect of DC drainage.