埋地钢质管道交流腐蚀的评价准则  

Assessment code for AC corrosion of buried steel pipe

作　　者：刘志军[1] 陈大庆[1] 金哲[1] 董研[1] 

机构地区：[1]中国石油天然气股份有限公司管道沈阳技术分公司,辽宁沈阳110031

出　　处：《油气储运》2011年第9期690-692,632,共3页Oil & Gas Storage and Transportation

摘　　要：强电线路对埋地钢质管道产生交流干扰进而诱发交流腐蚀的问题日益凸显。预测交流腐蚀发生的可能性时,国内以交流电位为评判指标,欧洲以交流电流密度为主要评判指标,两者均有标准可依。以某交流腐蚀管道为例,依据国内外相关标准对其交流电位、交流电流密度、保护电位和保护电流密度等参数进行测试和计算,比较了两种交流腐蚀评判指标的适用性,证明了以交流电流密度为主要评判指标的交流腐蚀评价准则具有更高的精确性,以及在交流干扰条件下传统的-850mV(CSE)保护电位评价准则的局限性。According to the occurrence possibility of AC corrosion prediction,domestic assessment code relies on AC potential,while European code depends on AC density,the both of which obeys corresponding standards. Taking a specific pipeline as an example,according to AC potential,AC density,protection potential and protection current density described in domestic and foreign standards,a series of testing and calculations are carried out. By comparing the practicality of two assessment codes, it is proved that applying AC density as the assessment index is available with higher precision for AC corrosion assessment, and the limitation of traditional code which specified-850 mV (CSE) as the protection potential under the conditions of AC interference.

关 键 词：管道 交流干扰 交流腐蚀 电流密度 评判指标 阴极保护准则 

分 类 号：TE88[石油与天然气工程—油气储运工程]