Japan-based Mitsui E&S Shipbuilding (MES-S) and Mitsui E&S Machinery (MES-M) have announced they have begun an engineering service for improving propulsion system efficiency of existing vessels to reduce GHG emissions.
The two Mitsui Holdings subsidiaries say that while the IMO’s EEDI regulations applying to newbuildings are reducing emissions for newbuildings, most of the vessels operating in the world and built before EEDI regulations applied have not been improved from their original design. Consequently they have higher GHG emissions on a tonne/mile basis compared with vessels built after EEDI regulations applied.
Social demands for reducing GHG emissions for existing vessels are increasing and measures are required urgently. Under such circumstances, MES-S and MES-M propose improving the propulsion system as a whole to achieve GHG emissions reduction for existing vessels utilising the technologies on propulsion efficiency and main engine energy efficiency that have been developed more recently.
By MES-S’s engineering service, propulsion efficiency of existing vessels is improved by optimised Energy Saving Devices and propeller design according to individual vessel design, which has been developed together with MES-S’s subsidiary, Akishima Laboratories (Mitsui Zosen) based on optimisation design technology using the existing vessel’s hull form data. Further, MES-M improves energy efficiency for own manufactured main engines by optimising it’s tuning to match the vessel’s actual operation. These improvements combine to maximise the effect of GHG emissions reduction under collaboration between MES-S and MES-M.