Abstract: Taking the loading and unloading station of liquefied gas vehicles in a enterprise as an example, computational fluid dynamics（CFD）simulation was used to establish a full-size 3D model in view of the dangerous characteristics of liquefied gas. Simulation calculation for explosion was carried out on the scene duo to LPG leakage and vapor cloud accumulation in the nearby parking lot to evaluate the impact of explosion on the surrounding buildings, and to analyze the relationship between the number of parking lots and the explosion overpressure. The results showed that the non-explosion-proof control room and other structures would be damaged and collapsed by explosion within a certain distance, threatening the safety of workers in the control room. The explosion overpressure was linearly related to the number of vehicles in the parking area, therefore the number of vehicles in the loading and unloading area should be limited.

Key words: LPG, explosion overpressure, flame acceleration simulator, building damage, numerical simulation