The Transportation Security Board of Canada (TSB) investigated a grounding incident involving a normal cargo vessel within the South Shore Canal of the St. Lawrence Seaway, Quebec, on 22 August 2024. The aim of the investigation was to establish security deficiencies and enhance marine transportation security.
What Occurred
Whereas transiting the South Shore Canal, the vessel misplaced propulsion on account of an automated main-engine shutdown triggered by the oil mist detector (OMD). As propulsion was misplaced, the vessel sheered to each canal banks and subsequently grounded, blocking the waterway. Anchors have been deployed, and no accidents or air pollution have been reported. The vessel sustained minor hull injury and was later refloated with tug help. The canal remained closed to navigation for 37 hours.
Why It Occurred
Throughout deliberate upkeep, the vessel acquired and put in a distinct mannequin of OMD measuring head. This mannequin required an exterior energy supply for its heater, which was not out there, leaving the heater unpowered. With out heating, the OMD grew to become susceptible to false alarms brought on by water vapour. Water vapour within the OMD triggered a false alarm through the voyage, shutting down the primary engine and leading to a lack of propulsion. Regardless of notification to the technical division {that a} totally different mannequin was equipped, no corrective follow-up occurred. Efficiency exams and inspections didn’t establish the unpowered heater, because the OMD continued to cross useful checks.
Actions Taken
Following the incidence, the working firm changed the OMD measuring head with the proper mannequin, underneath the supervision of a category surveyor. The substitute was put in, calibrated, and examined according to producer necessities.
Classes Discovered
Guarantee spare components equipped to vessels are right and totally appropriate with current techniques, particularly safety-critical gear.
Confirm that every one parts of safety-critical gadgets, resembling OMD heaters, are powered and useful throughout inspections and efficiency testing.
Strengthen technical division follow-up when discrepancies in gear fashions are reported.
Incorporate checks into deliberate upkeep techniques to verify full performance, not simply alarm responses.
Apply corrective actions throughout the fleet when related incidents happen to cut back the danger of recurrence.
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Supply: Transportation Security Board of Canada
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