Additional requirements

The DNV classification rules for “Rotating machinery – drivers” do not include MARPOL Annex VI regulations for engine emissions. Addi-tional rules for emissions apply for class notations Clean, Clean(Design), Clean(TierIII) and Clean(Design, TierIII) are available in DNV-RU SHIP Pt.6 Ch.7 Sec.2. For vessels operating with periodically unmanned machinery space class notifications E0 and EC0 will give additional requirements for main engines as per DNV-RU SHIP Pt.6 Ch.2 Sec.2.

M/S MERSol has two Wärtsilä W20 main engines with MCR 1600 kW and engine revolution 1000 rpm. Typically, marine engines are type approved by most of the IACS classification societies, as the requirements vary only slightly and it’s more efficient to fulfill all the regulations than build different engine versions for different class societies. Some variation can be found on customer features and customer inter-face.
M/S MERSol has four remote control stations for propulsion. One in the engine control room, one on bridge main panel and one wing control slave station on each of the bridge wings. In addition, both main engines have local control panels. Shutdowns (excluding overspeed and emergency stop) and load reductions (pitch reductions) are arranged with override possibility at the bridge. As a divergence from DNV rules it’s possible to override shut down for low lubrication oil pressure. A load reduction for high cooling water temperature caused by a sensor failure will be automatically cancelled from the engine automation. (Wärtsilä, 2012 and Wärtsilä, 2012)