سجاد صادقي سجهرود

The growing expansion of process industries an‎d the widespread use of hazardous chemicals such as methanol have increased the likelihood of incidents such as leakage, explosion, an‎d Fire. Due to its high flammability an‎d severe toxicity, methanol is considered one of the highrisk materials in petrochemical industries. In this study, in order to identify an‎d analyze the consequences arising from potential accidents in methanol storage tanks, the PHAST software one of the powerful tools for consequence modeling—was employed. In this regard, various scenarios of methanol leakage with different diameters (150, 100, 50 mm) an‎d heights (1-8m) were defined, an‎d parameters such as thermal radiation intensity, explosion overpressure, probability of death due to toxicity, an‎d the impact range of Fires were eva‎luated.The results showed that increasing the leak diameter from 50 mm to 150 mm an‎d the tank volume has a direct an‎d significant effect on the severity an‎d extent of the consequences; for example, the explosion overpressure radius increased dramatically from 30 meters for the 50-mm leak to 140 meters for the 150-mm leak. Similarly, by increasing the tank volume from 397 m³ to 32,619 m³, the radius of 4 kW/m² thermal radiation for a pool Fire rose from approximately 130 meters to around 175 meters. Moreover, atmospheric conditions—particularly temperature an‎d wind speed—play a decisive role in the intensity an‎d direction of vapor dispersion an‎d thermal waves. For a more detailed analysis of the causes an‎d potential consequences of incidents, the Fault Tree Analysis (FTA) method was used to identify the factors contributing to leakage, an‎d the Event Tree Analysis (ETA) method was applied to eva‎luate the sequence an‎d possible outcomes following the initial event. The results of these analyses identified the critical pathways to accident occurrence an‎d the effectiveness of safety barriers, demonstrating that increasing leak diameter has a direct impact on the thermal hazard radius an‎d explosion range, whereas unstable atmospheric conditions lead to a wider extent of contamination. The integration of fault tree an‎d event tree analyses with consequence modeling provides a comprehensive view of incident behavior an‎d can serve as a basis for designing safety systems an‎d emergency response planning in similar process units. The findings of this study indicate that consequence modeling can be highly effective in designing safer storage units, determining safe equipment spacing, an‎d developing emergency response plans, ultimately improving safety, reducing risk, an‎d enhancing monitoring an‎d control systems in methanol storage facilities. Keywords: Consequence modeling, methanol, PHAST, Fire, explosion, leakage, process safety

واژه هاي كليدي: مدل سازي پيامد، متانول، PHAST، آتشسوزي، انفجار، نشت، ايمني فرايند

Keywords: Consequence modeling, methanol, PHAST, Fire, explosion, leakage, process safety

sajjadsadeghisejahrood

Dr. Soroush Baradaran