摘要
对苏州地区三条受地铁干扰管道进行了24 h连续电位监检测并埋设了腐蚀检查片。利用傅里叶变换对电位监检测数据进行了频域分析,并统计出地铁干扰下管道电位干扰频率动态特性。基于腐蚀检查片实测腐蚀速率和管道电位干扰频率动态特性分析讨论了管道腐蚀速率定量评估办法。对比分析了地铁运行高峰时段(7∶00—9∶00)与24 h管道阴极保护参数的差异。结果表明:高峰时段管道断电电位平均值与24 h断电电位平均值差异较小,差值小于60 mV,且与管道位置区域无关;管道电位具有明显频率分布特征,主要干扰波动周期为0~250 s,其中,电位波动周期为0~150 s的占比超过80%;利用试片24 h电量数据与高峰时段电量数据计算得到理论腐蚀速率、有效腐蚀率等结果偏差较小,苏州地区管道有效腐蚀率为1%~30%。
Continuous potential monitoring in 24 h was carried out on three pipelines interfered by metro in Suzhou area and corrosion inspection coupons were embedded.Fourier transform was used to analyze the potential monitoring data in frequency domain,and the dynamic characteristics of potential interference frequency under metro interference were calculated.A quantitative evaluation method of pipeline corrosion rate was investigated based on the corrosion rates tested by inspection coupons and potential interference frequency of pipeline.The difference of the cathodic protection parameters of pipeline between the peak hours(7:00-9:00)of metro running and 24 h was compared and analyzed.The results showed that the difference of average value of off-potential between peak hours and 24 h was small,which was less than 60 mV and had nothing to do with the pipeline location area.The pipeline potentials had obvious frequency distribution characteristics.The main interference cycles were O-250 s,in which fluctuation cycles of 0-150 s accounted for more than 80%.The differences of corrosion rate and effective corrosion rate calculated from between 24 h electric quantity data and peak hour electric quantity data were small.The effective corrosion rate of the pipeline in Suzhou area was 1%-30%.
作者
李敏锋
吴广春
陈玉亮
赵万里
濮春明
张梦梦
LI Minfeng;WU Guangchun;CHEN Yuliang;ZHAO Wanli;PU Chunming;ZHANG Mengmeng(Suzhou Rail Transit Group Co.,Ltd.,Shuzhou 215000,China;Safetech Research Institute,Beijing 102200,China;PipeChina West-East Gas Transmission Company Jiangsu-Zhejiang-Shanghai Gas Transmission Branch,Nanjing 210000,China)
出处
《腐蚀与防护》
CAS
CSCD
北大核心
2023年第8期83-88,116,共7页
Corrosion & Protection
关键词
管道
地铁杂散电流
傅里叶变换
波动特性
腐蚀风险
pipeline
metro stray current
Fourier transform
fluctuation characteristic
corrosion risk
作者简介
通信作者:张梦梦(1992-),工程师,硕士,从事管道腐蚀与防护工作,19981205068,zhangmm@ankosri.com。
