储罐底板下表面阴极保护系统设计的常见问题

Common problems with cathodic protection system design for the lower plate surface of tank bottom

外加电流阴极保护系统是对储罐底板下表面进行保护的一种常用方法。由于国内外对储罐底板进行保护的一些理念不同,阴极保护的具体做法存在部分差异。某些国内的通用做法因在国际项目中不适用,将会对项目的执行和验收产生不利影响。为避免此类问题的发生,通过标准对照、设计计算和理论分析等手段,结合部分工程实例,对海外项目储罐底板阴极保护系统设计中遇到的常见问题进行了分析,并参考相关国际规范和NACE阴极保护认证课程中推荐的做法,从罐底板防腐层、网状阳极布局、参比电极布局、罐底的绝缘处理和阳极材料的选取等方面对储罐底板的阴极保护设计进行讨论,推荐了合理的设计方案。

Impressed current cathodic protection system is a common method used to protect the lower plate surface of tank bottom.Due to differences in domestic and foreign ideas in the protection of tank bottom plate,there are some differences between specific practices of cathodic protection.Some common domestic practices may be not applicable to international projects,adversely affecting the implementation and acceptance of projects.In order to avoid such problems,common problems in the design for cathodic protection system of tank bottom plate involved in overseas projects are analyzed through standard control,design calculation,theoretical analysis and other means in accordance with some project instances.With reference to relevant international standards and practices recommended in the NACE cathodic protection certification courses,cathodic protection design for tank bottom plate is discussed in terms of anticorrosion layer of the tank bottom plate,meshed anode layout,reference electrode layout,insulating treatment of the tank bottom plate,anode material selection and other aspects to recommend a reasonable design proposal.