13 LMM V I S I O N ISSUE 21 | Q2 2025 INCIDENT REPORT Incident Description During normal seagoing operation, the vessel experienced a M/E Turbocharger (T/C) “RPM OVERSPEED ALARM” followed by M/E Slow Down activation. After an on-board investigation by Chief Engineer, indications of a potential damage to T/C has been observed. Then, the M/E T/C was isolated with the installation of the locking devise as per Maker’s Instruction Manual, and vessel resumed passage with reduced speed (RPM). Root Causes I. Substandard Actions ●● Failure to secure (apparent exhaust gas ingress into T/ C bearing casing) ●● Failure to warn (no alarm / warning / indication prior incident) II. Substandard Conditions ●● Defective materials/Failure (bearing failure, T/C damage) ●● Hazardous environmental conditions (exhaust gases) ●● Inadequate warning system (no alarm / warning / indication prior incident) ●● High temperature exposure (localized thermal conditions Lessons learned ●● The incident underscores that localized failures— such as shaft seal degradation—can critically impair turbocharger operation, even when routine lube oil analysis shows normal results. ●● This highlights the need to include more targeted inspections in the scope of overhaul, such as borescope checks of components, as oil sludge formation may not be detected through standard oil sampling alone. ●● Proper lubrication of ME T/C is critical for its normal operation. M/E Turbocharger Overspeed M/E Turbocharger with engaged Locking Device by exhaust gas ingress) ●● Development of oil sludge film (other) IΙΙ. Job Factors ●● Excessive wear & tear ●● Inadequate lubrication (other)
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