RESERVE BUOYANCY

Reserve Buoyancy refers to the additional buoyant force available in a vessel beyond what is required to keep it afloat at its current load. It is the watertight volume of a ship above the waterline that helps the vessel remain stable and safe, especially during rough seas, flooding, or added weight.

Buoyancy
●The upward force exerted by water that keeps a ship floating.
●It is created by the displacement of water equal to the ship’s weight.

Reserve Buoyancy
●The enclosed, watertight volume above the waterline.
●Provides extra floating ability if the ship takes on additional load or encounters heavy weather.
●Critical for safety and survivability.

Waterline
●The line where the hull meets the surface of the water.
●Indicates how deep the ship is sitting in the water.

Freeboard
●The vertical distance between the waterline and the main deck.
●Higher freeboard generally means greater reserve buoyancy and improved seaworthiness.

Buoyant Volume
●The submerged portion of the ship below the waterline.
●Responsible for generating the buoyant force that supports the ship’s weight.

Non-Watertight Superstructure
●Structures above the main deck that are not fully sealed against water.
●These areas typically do not contribute significantly to reserve buoyancy.