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
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- DOI:
- 作者:
- 赵晋云1, 滕延平1, 张丰1, 王巨洪2, 冷旭跃2, 罗志国2
ZHAO Jin-yun1, TENG Yan-ping1, Zhang Feng1
- 作者单位:
- 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
PetroChina Pipeline R&D Center, Langfang 065000, China
- 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
pipeline;stray current interference;close interval potential survey (CIPS);direct current voltage gradient survey (DCVG);cathodic protection;coating
- 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.2013,1(1): 56-58 收稿日期：2012-5-21DOI：10.3969/j.issn.1001-2206.2013.01.017作者简介：赵晋云（1972-），女，山西清徐人，工程师，2005年毕业于天津大学测试计量技术及仪器专业，硕士，现从事油气管道检测评价和相关技术标准研究工作。参考文献：
[1] NACE RP0502-2002，Pipeline External Corrosion Direct Assessment Methodology[S].
[2] Peter Nicholson. Combined CIPS and DCVG Surveys for Improved Data Correlation[A]. NACE Corrosion 2007[C]. Nashville,TN:NACE, 2007. Paper 07181.
[3] NACE SP 0207-2007，Performing Close-Interval Potential Surveys and DC Surface Potential Gradient Surveys on Buried or Submerged Metallic Pipelines[S].
[4] Peter Nicholson. Correcting CIPS Surveys for Stray and Telluric Current Interference[A]. NACE Corrosion 2007[C]. Nashville,TN: NACE，2007. Paper 07182.
[5] 涂明跃，葛艾天. 陕京管道外腐蚀直接评价（ECDA）实践[J]. 腐蚀与防护，2007，（7）:369-372.
[6] Segall S M, Eng P. Use of an Integrated CIPS/DCVG Survey in the ECDA Process [A]. NACE Corrosion 2007 [C]. Nashville,TN:NACE， 2007. Paper 06193.