A newly built specialist cargo vessel narrowly avoided a major fire after a temperature probe in its main propulsion system gearbox detached during a voyage, leading to a significant oil leak. Operating at 25 bar, the oil was ejected forcefully from the gearbox, creating an oil jet that sprayed a large portion of the engine room, including a running main engine, reports MAIB.
Incident Overview
The oil leak occurred when the temperature probe, held in place by a pipe compression fitting, detached due to insufficient tightening during the vessel’s construction. As a result, the gearbox oil was forced out under high pressure, covering the engine room, including critical components such as the engine exhaust lagging, which began to smoke.
Upon detecting the low oil pressure alarm, the vessel’s engineers quickly responded by stopping the engines and informing the captain. The crew promptly went to emergency stations, with the firefighting team donning their breathing apparatus and preparing for a potential fire. Anticipating ignition, the engineers strategically placed foam fire extinguishers near the oil-soaked areas.
Their proactive approach paid off when the exhaust lagging caught fire a few minutes later. The crew quickly extinguished the flames with foam, preventing further damage. Small subsequent fires were also efficiently managed.
Investigation and Aftermath
After safely reaching port, an investigation was conducted involving the shipbuilder and gearbox manufacturer. The probe fitting, which had not been fully tightened during the build, was identified as the cause of the incident. The probe was held by an insubstantial fitting that, once loose, could not withstand the oil pressure, leading to the leak.
To prevent future incidents, the manufacturer designed a new, more robust fitting and probe housing that could be securely tightened and changed while the propulsion system was operational.
Lessons Learned
- Crew Readiness: The crew’s quick response and familiarity with emergency procedures played a crucial role in preventing a potential disaster. Their preparedness and proactive measures, such as placing foam extinguishers near high-risk areas, were key to managing the situation effectively.
- Enhanced Monitoring: New vessels often encounter unforeseen issues once operational. Increased vigilance and thorough monitoring during the initial months can help detect and address these snags early. A deep understanding of onboard systems is essential in mitigating unexpected challenges.
- Improved Equipment Design: The incident highlighted the importance of robust equipment design, particularly in critical systems. Poorly designed components increase the risk of failure and can lead to dangerous situations. The redesigned fitting provided by the manufacturer ensures greater safety and reliability, allowing for maintenance without disrupting operations.
This incident underscores the importance of crew readiness, thorough monitoring of new vessels, and the need for reliable, well-designed equipment in maintaining maritime safety.
Did you subscribe to our daily Newsletter?
It’s Free! Click here to Subscribe
Source: MAIB
