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Description
Use of Environmental Acceptable Lubricants (EAL) in stern tubes has risen some uncertainties in the shipping sector due to their poor hydrolysis stability, bad pressure and temperature-related viscosity properties and in some cases shear thinning properties when compared with conventional and pollutant mineral oils. The main goal of this project is to develop a more reliable and cost-effective EAL that can solve these main limitations. Two parallel approaches have been chosen to reach the main goal:
• Develop a new EAL based on the use of blown rapeseed oils (BRSO) with improved rheological properties and hydrolysis stability.
• Establishment of microbial-based formulations using selected microorganisms capable of producing a range of molecules that can be used as lubricant additives.
Summary of project results
The project aimed at finding an environmentally acceptable replacement for mineral lubricants currently used in stern tubes of ships, which contribute to marine pollution.
The project team developed a new EAL based on blown rapeseed oils (BRSO) with improved rheological properties and hydrolysis stability. They established microbial-based formulations using selected microorganisms capable of producing lubricant additives. The project conducted extensive testing and analysis of base fluids, additives, and formulations to optimize their performance and compatibility.
A new EAL formulation with the working name BIOSTERN SE 100 was developed that meets the stringent requirements for stern tube lubrication while being environmentally acceptable. The new formulation offers improved hydrolysis stability, pressure and temperature-related viscosity properties, and shear thinning properties compared to existing EALs. The project''s results benefit the shipping industry by providing a more reliable and cost-effective EAL solution, reducing environmental pollution from stern tube lubricants.
The beneficiaries include ship owners, operators, and manufacturers, as well as the marine environment and society at large.
Summary of bilateral results
The bilateral collaboration has led to strong relations between partners, with joint results and continuous dialogue opening new R&D pathways in the Norwegian maritime sector and beyond, including the exploration of future projects and proposals. Both partners shared expertise, with the Norwegian partner facilitating valuable industry contacts, and plans are in place to apply together for EC calls, including WIDERA and a Horizon project coordinated by SINTEF.