PENERAPAN METODE FMEA PADA PERAWATAN SISTEM MEKANIK KAPAL ISAP PRODUKSI TIMAH

Abstract

Offshore tin mining operations by PT Timah Tbk rely heavily on the operation of Tin Suction Dredgers (KIP). However, the corrosive marine environment and high workloads make the KIP's mechanical systems prone to failures, resulting in significant operational downtime. This study aims to identify the types and causes of mechanical system failures on the KIP Timah 07 vessel, determine component risk levels using the Failure Mode and Effects Analysis (FMEA)  method,  and  formulate  appropriate  preventive  maintenance recommendations. Research data was derived from downtime logbook records spanning 17 months (January 2025 – May 2026). Analysis results indicate that mechanical system malfunctions accounted for 36.97% (3,182.0 hours) of the vessel's total downtime. The three systems contributing the most to mechanical downtime were the GDO cutter and gearbox (33.03%), the HCL gearbox (26.76%), and the GDO cutter coupling (13.81%). Based on Risk Priority Number (RPN) calculations, three failure modes were identified as having the highest priority for intervention: GDO cutter motor/drive failure (RPN = 336), soil pump joint breakage/failure (RPN = 288), and soil pump bearing issues (RPN = 245). Proposed recommendations include implementing a scheduled preventive maintenance program for the GDO cutter, conducting periodic Non-Destructive Testing (NDT) inspections on joints, and performing vibration monitoring on soil pump bearings.