The main engines and aggregates turbozubchatye place, usually in the hold. Their foundations should have a tough relationship with a core set of shell. On single-shaft ships main engine or main unit turbozubchaty are usually located in the center plane, while twin-shaft installations, or when two engines operating on a common shaft, the main engines installed symmetrically about the centerline plane. When echelon arrangement of spp starboard main engine is located in the nose compartment, and the engine left side – in the stern that allows you to save adopted the numbering of units and mechanisms. Main steam generators can be placed in the hold, and on the platform, depending on the overall layout of the premises spp. Installation of steam boilers on a platform typical for large vessels in the aft spp.
The main power equipment is necessary to have evenly on both sides of the center plane in order to maintain the equilibrium of moments of the masses. The overall layout of the equipment may be single-tiered ems and multi-tiered, depending on the height of buildings. With multi-tiered arrangement of major equipment is placed not only in the hold, but also on the platforms and intermediate decks. Equipment that serves a particular system, seek to establish in one place single units. Particular attention is given to placement of marine pumps of various systems to provide the necessary suction conditions under all possible conditions operation of the vessel. Premises spp limited watertight are fitted with two outlets on the main deck (on different sides), as well as an emergency exit to the open deck.