原油储罐长效防腐措施

A Long-term Anticorrosion Measure for Oil Tank

根据油罐的腐蚀特点,介绍了一种全面、完善的长效防腐措施。即对油罐内部采用涂料与阴极保护相结合的方法,而对油罐外底板土壤侧的腐蚀除采用与罐内相同的保护方法外,还可采用外底板外加电源阴极保护方案。在对油罐进行内防腐施工时,油罐内壁的其他部位可采用油罐专用导静电涂料,但内底板绝对不能使用这种涂料。因为导静电涂料与牺牲阳极并用会加速阳极溶解,失去应有的阴极保护作用。对外底板的阴极保护可采用牺牲阳极法,也可采用外加电源法。推荐了几种外加电源的阳极设置方案。通过对施工后运行的油罐进行检测可以看出,其保护电位的测试结果为:内底板-0.95V,外底板-0.9V,均达到了良好的保护状态。

The paper introduces a comprenensive,perfect long-term corrosion protection measure according to the properties of corrosion for oil tanks,that is,a way of using coating materials combined with CP for the internal tank wall, while using impressed current CP as well for the corrosions occured around the outer plates of tank bottom adjacent to the soil side. When internally applying to the tank wall,the special coating material of electrostatic conduction can be used to the overall tank wall except the internal bottom plate,because the anode dissolution will be speeded up to loss CP function if this material is in corporatelly used with sacrifice anode. As for CP for outer protection of tank bottom, sacrificial anode method and/or impressed current CP can be used. Several programs for anodes allocation of impressed current are recommended. Good protection results have been obtained, which is proved by inspections made for operating tank protected with the measures introduced in the paper; the protective potentials for inner plate and outer plate of tank bottom are-0. 95 V and-0. 9 V respectively.