摘要
依据2004年美国国家标准学会(ANSI)和腐蚀工程师协会(NACE)联合发布的阴极保护检查片新技术标准,于2005-2006年在西气东输管道苏浙沪管段沿线,开展检查片评估阴极保护效果的现场试验。经过检查片设计、试验方案实施以及数据处理分析,得到了管道沿线阴极保护度和土壤腐蚀性分布;获得该地区IR降误差的统计值为170mV,并修正了管道保护电位准则(以-1.02 V替代-0.85 V)。研究结果表明:受杂散干扰的马鞍山、芜湖附近管道受到良好保护;东桥、无锡处管道保护电位衰减过快,存在接地的可能;该阴极保护系统容量至少覆盖试验中大、小检查片的面积变化;利用危险性矩阵可以分析管道外腐蚀危害的风险等级、危险来源等。
Field tests were made along the line of Su-Zhe-Hu section of west-east gas pipeline during year 2005 -2006 for assessing cathodic protection （CP） effectiveness by the new standard of CP coupon, issued jointly by ANSI and NACE in the year 2004. Through CP coupon design, test implementation and test data analysis, a lot of valuable conclusions were obtained. The actual CP effectiveness of Ma＇anshan and Wuhu pipeline suffered stray interference was well. The soil corrosibility distribution along the pipeline was obtained. IR-drop statistical value of 170 mV was obtained to revise protection potential criterion that is substituting - 1.02 V for - 0.85 V. The protection potential curve along the pipeline shows that Dongqiao and Wuxi potential decayed excessively quickly, existed the probability of grounding. The contrast test shows that the capacity of this CP system at least covered the area change of big and small coupons. The criticality matrix was used to analyze risk rank and hazard source of pipeline external corrosion. So pipeline CP condition was completely assessed, and proprietor worry questions were answered.
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第3期122-127,共6页
Journal of China University of Petroleum(Edition of Natural Science)
基金
中石油西气东输管道公司资助项目
关键词
西气东输管道
外部腐蚀
阴极保护检查片
阴极保护效果
风险评价
west-east gas pipeline
external corrosion
cathodic protection （CP） coupon
cathodic protection （CP） effective-ness
risk assessment
