储罐网状阳极阴极保护电流密度需求  被引量:3

The current density requirements of cathodic protection system applying grid anode for storage tank

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作  者:张丰[1] 金宏 侯浩 薛致远[1] 陈洪源[1] 王维斌[1] 

机构地区:[1]中国石油管道科技研究中心.中国石油天然气集团公司油气储运重点实验室,河北廊坊065000 [2]中国石油管道公司郑州输油气分公司,河南郑州450000 [3]中国石油西南管道公司兰成渝输油分公司,四川成都610000

出  处:《油气储运》2013年第4期426-430,共5页Oil & Gas Storage and Transportation

摘  要:网状阳极系统的优点在于储罐外底板保护电位分布均匀,对附近管道干扰小。采用瞬时同步断电法对2个站场的11座储罐进行检测,结果表明:控制电位达到-1.1V时,储罐仍可能未达到有效保护,原因是恒电位仪输出电流或保护电流密度过小,而日常管理通常只关注通电电位,易忽视因IR降造成的欠保护。储罐阴极保护相关标准要求电流密度在1~10mA/m2,推荐范围为5~10mA/m2,而检测结果表明:两站场电流密度为1~2mA/m2时,断电电位基本达到了-850mV。由于电流密度需求受储罐液位和季节等其他因素影响,虽然标准中仅要求在阴极保护系统投运时以消除IR降电位确认电流密度需求,但在运行维护过程中仍需定期以断电电位确认电流密度需求,以有效避免潜在的欠保护风险。(表12,参5)The advantage of the grid anode system is that the protection potential is evenly distributed on the storage tank's bottom plate, with small interference on nearby pipeline. The test results from 11 storage tanks in two pump stations with instantaneous synchronized switch-off method showed that when control potential reached -- 1.1 V, the tank still may not be effectively protected because the potentiostat output current or protection current density was too small, however, the daily management were usually only concerned with energized potential, easily overlooking under-protection due to the IR drop. The standards on storage tank cathodic protection require that the current density should be 1-10 mA/m2, and the recommended range is 5~10 mA/m2, but test results showed that when the current density of two pump stations was 1-2 mA/m2, the switch off potential reached --850 mV. As the current density requirements are influenced by tank level and seasonal factors, although the standards only require that current density requirement is determined based on potential eliminating IR drop when cathodic protection system is put into operation, it is still required to regularly determine the current density requirements in operation and maintenance process based on switch off potential to effectively avoid the risk of under-protection. (12 Tables, 5 References)

关 键 词:站场 储罐 网状阳极 阴极保护 电流密度 断电电位 

分 类 号:TE988[石油与天然气工程—石油机械设备]

 

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