When the required vessel power profile has been evaluated and determined, both with regard to propulsion load and electrical load, the next step is to design the engine room configuration so that it will also be optimal with regard to installation, operation and maintenance. MAN B&W Holeby has not only looked at this as an isolated case for the L16/24 type auxiliary engines but, as described in the following, has also looked at it in relation to the MAN B&W two-stroke main engine on board. The unifuel system is the proof of this where the fuel oil, cooling water and starting air systems are an integrated entity, minimizing the use of components and space, lowering the first cost, and providing simpler operation and maintenance.