Wärtsilä supplied the propulsion machinery for the Viking Grace, the world’s first LNG powered passenger vessel. Viking Grace, Ro-Pax ferry, 2013
According to the agreement, Wärtsilä's scope of supply includes four Wärtsilä 8L50DF main engines, the transverse bow and stern tunnel thrusters, as well as two stainless steel fixed pitch propellers with propeller shaft lines including environmentally sound shaft line seal systems, the LNG tanks and fuel supply and handling equipment with safety and automation systems. Due to the lowest possible pressure impulses generated by the propellers, the vibration level in the stern hull is very low. Wärtsilä will supply a sound-absorbing system to minimise noise generated by the engine, thus increasing passenger comfort. A low noise level is also important as the vessel's route passes through the Turku and Stockholm archipelagos.