Namely, though OSHA's investigation, were found deficiencies in the refinery’s process safety management (PSM) program, involving failure to implement written procedures, insufficient hazard analysis and inadequate inspection of process equipment for highly hazardous chemicals used in the process.

In light of the situation, Philadelphia Energy Solutions (PES) is facing $132.600 in fines for its violations in process safety management.

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For the records, following the refinery's explosion, around 5.000 pounds of deadly chemical were released in the air, leading to its closure and bankruptcy.

As for the reasons that brought the fire, several reports from to the U.S. Chemical Safety and Hazard Investigation Board showed that was likely caused by a faulty pipe.