Abstract: Employe #1, Employee #2 and Employee #3 were performing blind installation activities at a pipe outlet flange, connected to the KO Drum and piping to a tower. The tower began to ignite once the flange was opened. A few minutes later, an explosion occurred. Employee #3 was standing on the catwalk several feet away from Employee #1 and Employee #2 when the explosion occurred. Employee #1, Employee #2 and Employee #3 were hospitalized, Employee #1 burns to approximately 90 percent his body, Employee #2 suffered burns to approximatley 65 percent of his body and Employee #3 suffered burns to approximately 45 percent of his body. Employee #1 passed away, Employee #2 and Employee #3, did survive the event, and were hospitalized for an extended amount of time.