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The dependency of the society on the hydrocarbon as an energy source has increased tremendously, leading to the rapid development of this process industry. A fire accident that occurred on the 6th of July 2016 at a petrochemical complex plant in the southern part of Iran, Mahshahr petrochemical zone, has called for a more robust and all-inclusive efforts toward ameliorating and forestalling future occurrence. The on-site investigations concluded that the fire was triggered by the leakages through the ruptured blind flange gasket in the pipeline. Thus, certain inquiries on the development of robust process safety technologies gave useful insight into those capable enough to identify and handle various uncertainties in the short and long time basis, to forestall catastrophic accidents. Therefore, it is worthy and pertinent to ascertain whether process safety technology is developing correspondingly at the same pace with the process industry. Are the correct things done in the right way? If yes, then why do these catastrophic accidents keep happening? If no, how can these uncertainties in the process be properly and adequately handled, contained and managed? Failure to provide adequate and incontrovertible answers to these questions toward taking uncompromising safety actions is an invitation to more accidents in the near future. In this study, explanation on how to identify and cope with various uncertainties in process safety science is provided through learning from a real case study of a fire accident that occurred in the aforementioned petrochemical plant. [ABSTRACT FROM AUTHOR]