%0 Journal Article %T Simulation of the Natural Gas Pipeline Explosion by Uusing PHAST Software and Investigation of Line Break Valve's Effectiveness %J Journal of Gas Technology %I Iranian Gas Institute %Z 2588-5596 %A Doust mohammadi, Meisam %A Mirhosseini, SeyedMohammad %A Lajevardi, Seye Hamid %A Zeighami, Ehsanollah %D 2023 %\ 07/05/2023 %V %N %P 70-85 %! Simulation of the Natural Gas Pipeline Explosion by Uusing PHAST Software and Investigation of Line Break Valve's Effectiveness %K Pipelines %K gas %K PHAST %K Automatic valve %K Line Break Valve (LBV) %K Consequence %R 20.1001.1/JGT.2022.559752.1008 %X In Iran, the buildings built around the gas transmission pipelines must observe two points: first, the density of the buildings, and second, the distance from the axis of the pipeline. These values ​​are determined by standard tables IGS-C-SF-015. However, by only the two mentioned points cannot be calculated the level of risk caused by the threat of pipeline explosion. The best way to calculate the level of risk that threatens buildings around pipelines is to use computer calculations such as PHAST software to estimate the consequences of accidents and analyze the results based on actual accidents. Nevertheless, it should be noted that the PHAST software also cannot calculate the effects of soil in the explosion for burial pipes. Therefore, the simulation by PHAST for an actual explosion-exposed gas pipeline can be a basis for other evaluations. After determining the correct software model, the effectiveness of using equipment that can reduce the explosion's consequences is also investigated. In this paper, after logical modeling for the actual explosion, the effectiveness of a standard protective device in gas pipelines called Line Break Valve (LBV) for reducing the consequences of an explosion is measured. First, is calculated the probability of performance LBV occurred in the explosion; then, the diagrams are compared the consequences of the explosion for two states; correct operation and non-operation of LBVs.Finally, for the simulated mode, it is observed that the correct operation of the LBV system could reduce the accident consequences by more than 60%. %U