simulation of the natural gas pipeline explosion by using phast software and investigation of line break valve's effectiveness

At present, the safe distance from iranian gas transmission pipelines is determined by standard tables igs-c-sf-015, in this paper, a comparison between the numerical values obtained from the real explosion radius with the least obstacles/surrounding structures and the results of calculating the potential hazard radius in a high natural gas pressure pipeline that calculated using phast software has taken place. it should be noted that the phast software cannot calculate the effects of soil on the explosion for burial pipes therefore, the non-burial of the incident pipe as considered an advantage for perform calculations and with the help of this software،the results of software modeling show the consequences of a real explosion significantly. this opportunity is obtained to use the simulation as a basis for calculating the impact of equipment such as automatic valve and other effective parameters to reduce the range of damage quantitatively. finally, the effect of the performance of the valves equipped with the automatic system (lbv) on the reduction of the consequences of the incident is calculated and compared by the diagrams. for the simulated mode, it is observed that the correct operation of the lbv system could reduce the accident consequences by more than 60%.