液化石油气球罐腐蚀分析及管理

通过对炼油厂储存液态烃球罐的腐蚀环境及维修历史的分析、腐蚀介质对球罐腐蚀的类型及其机理的探讨，得出引起LPG球罐腐蚀主要因素是硫化物应力腐蚀。提出加强球罐日常运行中的腐蚀物检测、控制H2S质量浓度10mg／L内、H2S含量超标的LPG停留球罐时间不超过48h、腐蚀裂纹维修后球罐表面硬度控制在HB200内并且作应力消除处理及做好球罐防腐等方式，是控制硫化物应力腐蚀的现实可行的管理方法，可以消除长周期运行中球罐内可能的腐蚀介质对球罐带来的安全影响。

Analysis of Corrosion in Spherical LPG Tanks and Management

The corrosion types and corrosion mechanisms of corrosion medimn in spherical tanks are studied through the analysis of corrosive environment and maintenance history of LPG spherical tank operation. It is concluded that the main factor causing the LPG tank corrosion is sulfide stress corrosion. The good practical methods to control sulfide stress corrosion are strengthening corrosion detection in daily operation, controlling the concentration of H2S to less thanlO mg/L, limiting the storage time to less than 48 hours when H2S content exceed 10 mg/1, in the tank, reducing hardness of internal surface to within 200HB and eliminating welding stress after mending sulfide stress craeking, which can eliminate the impact of corrosive medium in the spherical tank on the long-term safe operation.