A recent incident involving a vessel adrift in the US Gulf highlights the dangers of contaminated very low-sulphur fuel oil (VLSFO). The vessel lost propulsion for three days due to engine-clogging contaminants, putting both crew and vessel at risk near fixed oil rig infrastructure. This case study, conducted by VPS, underscores the significant threats and costs associated with contaminated marine fuel, as outlined by Steve Bee and Captain Rahul Choudhurl. It serves as a cautionary tale regarding the adoption of alternative fuels in maritime decarbonization.
The study points to the increasing complexity of fuel switching operations, particularly with the upcoming global emissions control areas (ECAs) and regional regulations. New ECAs, such as the Mediterranean ECA effective from May 2025, will require vessels to adhere to stricter sulphur content regulations. Ships must carefully execute fuel changeover procedures to comply with these regulations, which can lead to operational challenges, especially for those frequently entering and exiting ECAs.
In February 2025, a prominent shipowner bunkered a vessel with VLSFO that, while meeting initial specifications, contained volatile organic compounds that led to severe sludge formation. Despite warnings from VPS, the vessel was forced to use the contaminated fuel, resulting in clogged filters and purifiers. This situation escalated, causing the vessel to lose propulsion and drift dangerously close to oil rig structures, necessitating emergency interventions.
The repercussions of this incident were extensive, including significant costs for cleaning and repairs, disrupted crew schedules, and increased reporting obligations. The study emphasizes that contaminated bunkers can lead to considerable damage and stress onboard, raising serious safety concerns. The authors conclude that the potential consequences of such incidents could have been far worse, underscoring the critical need for vigilance in fuel management practices.
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