非接触式检测海底管线防腐层破损点的方法

Non-contact detection of the rotted points on the coating surface of the undersea pipelines

海底管线防腐层的阴极保护状态在深海环境下难以直接测量,分析防腐层破损引起周围环境电场电位变化关系,首次提出通过测量海底管线周围的环境电场电位分布而实现不接触检测海管表面防腐层破损点的方法。一是研制新型的深海用全固态的银/氯化银参比电极;二是利用虚拟仪器技术设计环境电场测量系统。在青岛滨海采用非接触测量系统进行了实验,实验结果表明该系统在距离海底管线4 m内均可以准确测量其周围的环境电场电位分布,检测出管线表面破损点。

In the deep sea, direct measurement of pipeline cathodic protection status is very difficult. We explored a non-contact method by measuring the potential distribution of the environment field around the undersea pipelines to detect the rotted points on the coating surface. It included two aspects： developing a new type of the solid-state Ag / AgCl reference electrode for the deep sea; useing the virtual instruments to design the environment field measurement system. The non-contact measurement system was applied in the ocean of Qingdao city, P. R. China as experiments. The experimental results show that the non-contact measurement system within four meter distance to the undersea pipelines, can accurately detect rotted points.