ABSTRACT
Intact stability is a basic requirement to minimise the risk of the capsizing of vessels. It is a guideline for the ship designer, ship operator and classification society to design, build and commission the ship before it starts its service life at sea. A comprehensive background study of intact stability development was written by Kuo & Welaya (Welaya & Kuo, 1981). Their paper “A review of intact stability research and criteria”, stated that the first righting arm curve was proposed by Reed in 1868, but that the application was presented by Denny in 1887. In addition, in 1935, Pierrottet tried to rationally establish the forces which tend to capsize a ship and proposed a limiting angle at which the dynamic level of the ship must be equal to or greater than the sum of energy exerted work done by the inclining moments. However, Pierrottet’s proposal was too restrictive in the design process and it was not accepted.
