Wärtsilä and RINA have announced a novel propulsion arrangement that offers full redundancy, less machinery, lower capital expenditure, reduced operational complexity, and optimised fuel consumption to lower costs and achieve emissions compliance.
The new concept changes traditional ship design thinking and offers an efficient, future-proof alternative. The conventional approach in ship design has been to use two-stroke engines for propulsion and 4-stroke engines for electric power generation. The Wärtsilä / RINA arrangement, however, requires just two four-stroke dual-fuel (DF) engines, with options for electric power back-up from batteries or a small DF generator when the ship is idle. The design can achieve a reduction of up to 50 per cent from the Energy Efficiency Design Index (EEDI) reference level value, and immediate compliance with the IMO’s 2030 targets.
The arrangement features Wärtsilä 31DF engines operating with LNG fuel.
At current shipping speeds, the system performance of the new arrangement provides at least the same, or better efficiency than an equivalent two-stroke design. At slower speeds, it has the potential to reduce fuel consumption and emission levels even further. Overall, the arrangement is as easy and less costly than traditional two-stroke propulsion systems.
“At Wärtsilä we are committed to leading shipping into a new era of higher efficiencies, lower operating costs, and greater environmental sustainability. This cooperation project with RINA is fully in line with these ambitions, and we see this propulsion arrangement as being an important and value-adding option for the coming generation of newbuilds,” said Lars Anderson, director, product management & sales support, Wärtsilä Marine Power.
“We are really excited about this new concept as it represents a proven and more efficient solution than was earlier possible. The combination of fewer running components and 100 per cent redundancy, with a single engine capable of handling both propulsion and electric power, even in port, promotes both safety and reliability. The highly efficient Wärtsilä 31DF engine enables ship owners to reduce fuel costs, while at the same time being proactively prepared for the fuels of the future,” stated Antonios Trakakis, Greece marine technical director at RINA.