Application of fault tree analysis on fire and blast accidents of LPG tank

LPG(Liquefied petroleum gas) is one of the usual dangerous chemicals.Contrast to the common chemical container,the chance of fire and blast accidents caused by LPG tank are larger,which means accidents caused by LPG tank will give rise to great losses and severe damages.So the study on the fire and blast accidents of LPG tank has a great significance.In view of the causation,the LPG tank accident can be classify into two different models,one is destruction of the chemical,the other is physical fire and explosion.In this paper the two types of accident of the LPG tank were analyzed,whick focused on the factors that cause fire and blast accident and physical blast accident of the LPG tank.The fault trees model was established with fire and blast accident and physical blast accident of the LPG tank as the top event.Through the qualitative analysis of these fault trees,all the minimum cut-sets affecting the top event were obtained.By calculating structure importance degree of the basic event,the primary factors which affect the accident of the LPG storage tank were confirmed.According to these results,corresponding measures were put forward so that the safety and reliability of LPG tanks could be ensured and improved.