Petrochemical plants are continuously turning into large-size corporations, the installations of facilities show a developing trend from ground to underground because of the difference in land using rate. In this regard, the safety distance of petrochemical equipment buried in both ground and underground cases were investigated based on risk assessment. As a case study, gasoline tank and LPG tank set on the ground and underground are singled out to compare the risks involved. The research showed that the setting case of installation had a great influence on safety distance. Two cases have 80% reduction of equivalent safety distance compared with the rest of the cases. It was found that when the gasoline storage tank was placed underground alone, the PLL value decreased by 36.7%. Only LPG tank was placed underground, and the PLL decreased by 6.33%, and the gasoline and LPG storage tanks were placed underground simultaneously, the PLL value declined by 42.3%. Thus, the layout of plants could be further optimized, which can greatly improve the performances of land use efficiency and safety. In addition, this paper, the selection of embedding methods and the sensitivity of underground case to overpressure was resumed from two aspects: soil properties and burial depth. For the soil properties, it was found that the water saturated sandy soil with high air content and the low density unsaturated sandy soil had better effects on weakening overpressure. Such properties are particularly beneficial to reducing the occurrence rate of accidents. In terms of burial depth, it can be observed that as the burial depth was changed from 0.5m to 1.1m, the value of overpressure has dropped dramatically. When the burial depth was 2m, the damage to personnel and buildings has been greatly reduced beyond 2m from the explosion center.

石化厂不断发展成为大型公司，由于土地使用率的差异，设施的安装从地面到地下呈现出发展趋势。因此，基于风险评估，研究了埋在地下和地下情况下的石化设备的安全距离。作为案例研究，将地面和地下设置的汽油箱和LPG箱单独挑选出来，以比较所涉及的风险。研究表明，安装的安装情况对安全距离影响很大。与其余案例相比，两个案例的等效安全距离减少了80％。结果发现，当将汽油储罐单独放置在地下时，PLL值降低了36.7％。只有液化石油气储罐放置在地下，而锁相环减少了6.33％，汽油和LPG储罐同时置于地下，PLL值下降了42.3％。因此，可以进一步优化植物的布局，从而可以大大提高土地利用效率和安全性。另外，本文从土壤性质和埋藏深度两个方面重新探讨了埋设方法的选择和地下案例对超压的敏感性。在土壤性质方面，发现高含水量的水饱和沙土和低密度的不饱和沙土对弱化超压效果更好。这些特性对于降低事故发生率特别有利。就埋深而言，可以看出，随着埋深从0.5m变为1.1m，超压值急剧下降。