摘要
针对秦京输油管道大兴站进站方向管道阴极保护不足而出站方向管道阴极保护电位整体偏高的问题,进行了现场调查和原因分析。指出进出站管道防腐层差异和阴极保护进出站通电点连接电缆电阻差异导致进出站管道阴极保护电流分配不均匀,是问题产生的主要原因。对3种解决方案进行了试验研究,结果表明:改变阴极保护回路电阻,对阴极保护输出进行合理分流,可以使进出站两个方向的管道均得到有效保护。根据计算,在其它条件不变的情况下,减小进站电缆电阻,可提高进站方向管道电位;增大出站电缆电阻,可增大进站方向管道电流并保持出站方向管道电流不变。该方法虽然能暂时提高阴极保护电位,平衡阴极保护的输出,但增大了阴极保护的输出电流,因此,对于防腐层质量较差的管道,不能从根本上解决问题,应尽快安排大修。
Lack of cathodic protection in the inlet side of the station and overhigh cathodic protective potential in the outlet side of the station in Daxing Pump Station in Qinhuangdao-Beijing Oil Pipeline were found.Field investigation and analysis were made.It is found that the non-uniform distributed cathodic protection current caused by both the resistance difference of the connection cable at the outlet side of the station and coating differences were the major reasons for the presented problem.Experimental research on 3 solutions was launched.Results showed that changing the circuit resistance could lead to the proper distribution of the CP potential,and thus provided an effective protection for both the outlet and inlet sides of the station.Based on the computational results,reducing the resistance of inlet cable would increase the inlet current in the original conditions,increasing the resistance of inlet cable would increase the inlet current in the original current conditions.This method could enhance the cathodic protective potential temporarily.However it increased the output current of the cathodic protection.Therefore,it can really not deal with the problem,and the out-of-service maintenance shall be arranged.
出处
《油气储运》
CAS
北大核心
2011年第10期736-738,714,共3页
Oil & Gas Storage and Transportation
关键词
管道
阴极保护
防腐层
保护电位
分流法
回路电阻
pipeline,cathodic protection,coating,protective potential,shunt method,circuit resistance
