RESERVE BUOYANCY

Reserve Buoyancy may be defined as the volume of the enclosed spaces above the waterline. It may be expressed as a volume or as percentage of the total volume of the vessel.

sample 1:

A box shaped vessel 105m x 30m x 20m is floating upright in fresh water. if the displacement is 19500 tonnes, find the volume of reserve buoyancy.

Volume of water displaced = Mass/Density = 19500/1.000 = 19500 m3

Volume of vessel                 = 105 x 30 x 20 = 63000 m3

Reserve buoyancy               = Volume of vessel - volume of water displaced

                                         = 63000 m3 - 19500 m3 = 43500 m3