Award-Winning Fleet Adoption, Now Four-Year Partnership with Spring Marine

Spring Marine, a leading Greek ship management company, first introduced Sulnox Eco on selected vessels in 2023 and subsequently conducted a two-year evaluation programme using Coriolis mass flow meters, torque meters and engine performance monitoring systems.

The evaluation recorded average fuel consumption reductions of c.5%, and on vessels where monitoring conditions permitted full specific fuel oil consumption (SFOC) analysis - one of the most rigorous measures of combustion efficiency - improvements of 3.6% to 5.9% were recorded.

Following the successful evaluation, Spring Marine approved fleet-wide rollout. The initiative is estimated to reduce annual CO₂ emissions by approximately 23,000 tonnes, while also supporting improvements in Energy Efficiency Operational Indicator (EEOI) and Carbon Intensity Indicator (CII) performance.

Operational benefits reported by onboard crews included:

• Cleaner combustion components with reduced carbon build-up on piston crowns, rings and grooves

• Injectors remaining clean and in good condition

• Purifiers operating efficiently with minimal sludge

• Consistently clean exhaust emissions with no visible black smoke

These results led to Spring Marine winning the "Industry Partnership Leader Award – Bronze" at the 2026 ESG Shipping Awards.

In announcing the award, the judging panel highlighted:

• Fleet-wide rollout of Sulnox Eco across Spring Marine vessels

• Measurable fuel consumption reductions averaging approximately 5%

• Estimated annual reduction of approximately 23,000 tonnes of CO₂ emissions

• Improved combustion efficiency and lower visible emissions

• Achieved without vessel modification, retrofit or capital expenditure

Building on these results, and after more than three years of using Sulnox Eco, Spring Marine has deepening its partnership with Sulnox with a: