It was very important to determine tank reasonable distance for raising the tank safe design level. The paper expounded the tank safe distance difference of domestic and for-eign standards. In allusion to the mainly floating tank fire accident forms, the limitation of domestic standard for tank safe distance was assessed, that is the current standard can not meet the safe requirement in the case of tank full exposure fire.By referring the tank pool fire ther-mal radiation model,the oil floating tank safe distance was obtained under critical thermal ra-diation strength. Finally, the paper put forward the principle of determining tank reasonable distance, with the comprehensive utilization of domestic standard and tank pool fire thermal radiation model and tank technological parameter. For less than 10 x 104 m3 tank as far as pos-sible to increase storage tank fire separation;for more than 10 x 104 m3 tank,the fire preven-tion span basic can meet the safety requirements of the current domestic standards.%研究确定储罐合理的防火间距，对于提高储罐安全设计水平具有重要意义。基于浮顶罐主要火灾事故类型，评价了国内标准关于储罐安全距离的局限性，即现有标准不能满足储罐全面积敞口火灾情况下的安全要求。基于储罐池火热辐射数学模型，计算出原油外浮顶罐在临界热辐射强度对应的储罐安全距离。新建储罐工程在满足国内标准基础上，建议结合储罐池火热辐射数学模型计算结果，综合考虑储罐防火堤面积、油品性质以及罐区消防设施能力。对于10×104 m3以下储罐应尽可能增加储罐防火间距，对于10×104 m3以上储罐，其防火间距基本可满足现行国内标准规定的安全要求。
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