12 LMM V I S I O N ISSUE 20 | Q1 2025 Corrective / Preventive Actions 1. Circulated among fleet vessels, in order to be discussed during next SCM, with the aim to increase awareness to all involved personnel on identified root causes and analyzing, the established preventive actions, through a team -engaged and open- ended questions discussions on board. 2. Overhauling and cleaning of stuck pilot spool. Existing maintenance instructions in PMS enriched with cleaning and inspection of the L.O. pump and pilot spool on preventive basis with 12-months interval on fleet vessels equipped with specific Maker and type, submission of new PMS job through appropriate Management of Change. 3. The subject incident brought to the attention of Builder / Maker with the aim of investigating any potential improvement, due to repeated failures through the years on fleet vessels. 4. Subject case will be presented and analysed during in-house seminar amongst all participating seafarers. Team Engagement & discussion topics ●● Describe what can cause shutdown alarm on a running Diesel Generator ●● Why is it important to have LO pump in proper operational condition when Diesel Generator is running? ●● What will you do in case of blackout? Incident Description On the 29th of January 2025, while vessel was anchored, with one Diesel Generator connected to the grid, shutdown alarm on running Diesel Generator No.3 was activated and instant blackout occurred. Stand-by Diesel Generator No.2 started automatically after the PMS identified the blackout event and connected to the grid to restore power on the network. Further investigation and troubleshooting revealed that Safety pressure switch for LO pressure experienced inconsistent activation of setpoint alarm and shutdown of DG. Potential Outcome ●● Injury / Pollution / Property damage ●● Permanent loss of electrical power output (power supply not being stored) ●● Inability to supply power to vessel’s consumer (as per their energy/load demands) ●● Delay of vessel’s schedule / loss of hire Root Causes I. Substandard Actions ●● Activation of shutdown alarm (other) ●● Pressure drop of lub oil (using defective equipment) II. Substandard Condition ●● Low LO pressure (other) ●● Stuck condition of pilot spool (defective equipment) IΙΙ. Job Factors ●● Excessive wear & tear ●● Improper/ inadequate preventive maintenance ●● Inadequate maintenance instructions Lessons learned Low lub oil pressure in diesel generator may activate its shutdown. INCIDENT REPORT Blackout due to trip of Diesel Generator no.3 LO Pump pilot spool
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