Abstract: For the safety of LPG in storage and transportation, taking a major explosion accident of LPG tank truck as an example, this paper discusses the causes and properties of the explosion accident, and uses ALOHA software to simulate the consequences of boiling liquid expansion to vapor explosion (BLEVE) and vapor cloud explosion (UVCE) caused by the leakage of the accident, and quantitatively gives the scope and risk factors of the accident. At the same time, through Google Earth software visualizes the simulation results, and puts forward corresponding suggestions and measures for different levels of dangerous areas, in order to provide certain theoretical reference and technical support for the emergency rescue and prevention of such accidents. Then, the simulation results are compared with the scene after the accident, and it is found that the simulation results are consistent with the facts. Finally, by exploring the influencing factors of the accident consequences, it is known that the on-site wind speed, relative humidity and other environmental factors are unfavorable to the development of the accident, which are the main factors causing serious consequences of the accident.

Key words: LPG, tank leakage; tank truck explosion accident, accident simulation, ALOHA, Google Earth