Analysis of the effects of storage tank implosion damage based on explicit dynamics calculations
As the main equipment for storing oil and gas resources and their products,if the storage tank explodes and is damaged,the burning liquid inside the tank will most likely flow out from the damage location,and if a flow-ing fire is formed,it will cause an irreversible large-scale safety accident.To this end,a three-dimensional finite ele-ment model of the implosion damage of the fluid inside the tank-the tank-the fluid outside the tank was established.Taking into account the multiphase coupling between the tank structure and the internal and external fluids,with a vertical vaulted storage tank as the object of study,and based on the exponential cohesion model failure criterion,the tank material was described and the crack propagation process of the tank was simulated by inserting bonded u-nits into the material,and the explicit dynamic damage analysis of the tank under the implosion load was carried out.The results show that the tank cracking location is above the liquid level,and the tank cracking speed is posi-tively correlated with the location of the initiation;with the continuous action of the implosion load,the fracture continues to expand,and the expansion speed slows down when the tank extends to the liquid level;no fracture is produced when the tank is full at the liquid level,and the average damage ratio increases from 78.8％to 88.4％when the tank level drops from half to empty,and the damage degree of the tank is negatively correlated with the liquid level;eccentric detonation average damage is 1.6％higher than the central detonation,that is,the eccentric detonation damage is more serious;tank volume from 1 000 m3 to 5 000 m3,if the liquid level accounts for less than 46％of the tank height,the average damage ratio of the tank from 88.2％to 88.6％,and vice versa,the average damage ratio of the tank from 86.4％to 84.4％.The results of the study can provide a reference for the prevention of tank explosions and the design of reinforcement for weak tank roof structures.
万方数据
维普
