As shipowners invest heavily in LNG, methanol and other alternative fuel technologies, a new technical commentary from marine chief engineer Mohamed Rabie raises questions about whether operational experience is keeping pace with regulatory pressure. He posits that many vessels are effectively serving as live testing environments while the industry is still learning how next-generation propulsion systems behave under real trading conditions.
For ship managers navigating tightening emissions regulations, there is a challenge in managing operational uncertainty across vessels equipped with systems that still lack decades of real-world service history.
In a technical commentary titled Beyond the Green Flame: A Field Reassessment of the Multi-Fuel Engine Transition from the Engine Room Perspective, marine technical advisor Mohamed Rabie argues that the maritime industry may be deploying alternative fuel technologies faster than it fully understands them.
“We are not merely testing new ships,” Rabie wrote. “We are testing engineering hypotheses on revenue-earning maritime assets.”
Rabie examines operational concerns linked to LNG, methanol and electric propulsion systems. He argues that LNG engines can perform effectively under stable high-load conditions, but notes that manoeuvring and fluctuating loads may introduce “non-linear shifts in combustion behaviour” alongside methane slip concerns and cryogenic storage complexity.
On methanol, he warns that operators may be transferring rather than eliminating operational risks. He cites lower energy density, material compatibility issues and the challenge of managing invisible flames and toxic vapours onboard vessels.
Rabie also argues that engine manufacturers are effectively preparing for continued uncertainty around future fuels by developing flexible propulsion platforms capable of handling multiple fuel types.
“What is being manufactured now are fuel-agnostic, flexible platforms,” he wrote. “This does not signify confidence in a single solution. It is a hedging strategy against deep uncertainty.”
The report serves as a reminder that decarbonisation decisions now extend well beyond compliance targets and fuel availability. Operational reliability, crew preparedness and lifecycle risk management remain central to the discussion inside the engine room.
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