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Investigation and Mitigation of High Vibration Issues in Fin Fan Steel structure at a Petrochemical Facility

Mohammed Tajammul Hussain1, Mohammed Faisal Ahmed2

1Independent Researcher, Kingdom of Saudi Arabia

2Independent Researcher, Kingdom of Saudi Arabia

Abstract - A petrochemical facility in Jubail, Saudi Arabia, experienced persistent high vibration issues in a group of Fin Fan units, resulting in repeated mechanical failures, unplanned maintenance, and operational inefficiencies. A comprehensive diagnostic investigation was carried out through collaboration between the facility’s reliability engineering team and specialized external vendors. The investigation employed bump testing, vibration spectrum analysis, mechanical inspections, and sequential operational testing to identify the root causes. Results indicated a resonance condition between the fin fan operating speed and the natural frequency of the supporting steel structure, compounded by mechanical defects and improper blade settings in one fan unit. Targeted corrective actions, including blade replacement and precise pitch and tracking adjustments, successfully reduced vibration levels to within acceptable industry limits. The implemented solutions restored equipment reliability and provided valuable lessons for the operation and design of fin fan structures in petrochemical facilities.

Keywords: optimization, structure, petrochemical