杂散电流干扰下管道CIPS/DCVG组合检测实践  

Combined CIPS and DCVG Survey Practice under Stray Current Interference for Buried Pipeline

作　　者：赵晋云[1] 滕延平[1] 张丰[1] 王巨洪 冷旭跃 罗志国 

机构地区：[1]中国石油管道科技研究中心,河北廊坊065000 [2]中国石油管道公司大连输油气分公司,辽宁瓦房店116300

出　　处：《石油工程建设》2013年第1期56-58,91,共3页Petroleum Engineering Construction

摘　　要：密间隔电位测试(CIPS)是目前检验管道阴极保护水平和腐蚀风险最有效的办法。但是当杂散电流或地电流引起管地电位波动时,很难正确解释检测结果。对于受杂散电流干扰影响的管道采用了CIPS/DCVG(直流电位梯度检测)组合检测,通过安装GPS同步断流器中断所有电流源以及在测试桩处安装智能数据记录仪记录杂散电流和地电流对管地电位的影响,可对CIPS数据进行有效的校正,开挖验证结果表明防腐层缺陷定位准确。实践表明该组合检测方法可以排除杂散电流干扰对检测数据的影响,有效识别防腐层缺陷位置,更加准确地评价阴极保护水平。CIPS seems to be the only reasonable tool for inspecting the cathodic protection level of the pipeline and subsequently estimating the risk of corrosion activity. When dynamic stray or telluric currents induce pipe-to-soil potential fluctuation, accurate interpretation of the results may be difficult. For buried pipeline affected by stray current interference, the combined CIPS/DCVG survey is applied. By installing GPS synchronized current interrupters at all CP current sources and by installing the intelligent data logger at the test pile to record the effects of stray and telluric currents on the pipe-to-soil potential, CIPS data can be corrected effectively. The excavation indicates that locating anticorrosive coating defects is accurate by the combined CIPS/DCVG survey. The method displays its advantage of effectively eliminating the impact of stray current interference and effectively identifying corrosion positions, and more accurately evaluating the level of cathodic protection.

关 键 词：管道 杂散电流干扰 密间隔电位测试(CIPS) 直流电位梯度检测(DCVG) 阴极保护 涂层 

分 类 号：TE973.6[石油与天然气工程—石油机械设备]