Investigation and Methodology Approach Forensic Study of Deteriorating Fin Fan Columns

When inspecting structures in an industrial facility on the Gulf Coast, deteriorated fireproofing was observed at a fin fan deck structure. The fireproofing had deteriorated to the point where it posed a major falling debris hazard in the plant. This paper is intended for structural design and inspection professionals, and will focus on the forensic study of corroded columns at a fin fan deck located at an industrial facility on the Gulf Coast. Furthermore, during the field investigation, plans were implemented to remove the fireproofing to mitigate the falling debris hazard risk. Upon removal of the fireproofing, it was discovered that the flanges of the steel columns had been significantly corroded and that more extensive repairs would be required. Through forensic investigation, the present damage was assessed, the root cause of damage was identified, and an effective repair plan has been implemented to maintain the integrity of the structure. The forensic investigation included a visual and tactile inspection at arm’s length distance from the affected members and ultrasonic thickness measurements of the corroded structural steel. Completing this thorough forensic study was a key to the success of the project.