Vessels are audited at regular intervals for the maintenance of various functions according to the Ships Safety Act. For a docking survey, the vessel maintains a minimum amount of fuel oil, ballast water, etc. and is in a status similar to a light weight status so has a high center of gravity than a normal sailing condition.
The ship shall undertake the voyage to be docked. The vessel needs to turn due to an action of avoiding the dangerous obstruction that may result from during sailing or due to an action for altering course and may occur to the risk of heeling depending on the degree of turning. If the stability is not good during turning, it may lead to major accidents such as sinking or capsizing.
In this paper, we selected 2 passenger ships(Seokyung Island, Seokyung Paradise) and 2 training ships(Hanwoori, Hanbada) to perform a study on the heeling angle during turing for passenger type vessel in lightship condition.
Of 4 kinds of turnings in the light ship condition of the passenger type vessel, the heeling angle formula (A heeling angle formula during turning of passenger ship based on IMO stability criteria, modified heeling angle formula during turning of passenger ship based on IMO stability criteria, a heeling angle formula in steady turning and heeling angle formula taken account of drift angle in steady turning) the heeling during turing was calculated according to GoM, the speed, and the speed length ratio.
The heeling angle calculation during turning was verified through an experiment of the real vessel: training ships “Hanwoori” and “Hanbada”. Average value was calculated through L/B based on selected vessel, the heeling angle during turning calculated for universalization and the numerical result was compared and analyzed.
The GoM, the speed, and the speed length ratio were presented that can meet the heeling less than 10 degree during turning, presented in the IMO stability criteria in the light ship condition of the G/T 4,000 ~ 6,000 ton class, L/B≒5 passenger type vessel.