Application of dead ship condition based on IMO second-generation intact stability criteria for 13K oil chemical tanker

The International Maritime Organization (IMO) has been actively developing the second-generation intact stability criteria of ships and discussing a technical issue. In this study, we focused on the dead ship condition and introduced the procedures of assessment for Lv1 (Level 1) and Lv2 (Level 2). If the Lv1 criterion of relatively simple calculation related to the GZ curve is not satisfied, the Lv2 criterion considering the hydrodynamics in waves were presented. In addition, the roll damping coefficient and wave slope function required to obtain the spectrum of the effective relative roll angle, which are the most important factors in the Lv2 criterion calculation, were accurately implemented. In this paper, the calculation process was described in as much detail as possible based on actual ship data (13 K oil chemical tanker), and finally, it was confirmed that the ship's vulnerability criteria were passed at Lv1 and Lv2. In particular, it can provide clues to predict the stability in advance in a dead ship condition in the event of a failure of an engine of the ship. •This study focused on the dead ship condition among the five modes of IMO second-generation intact stability and introduced the procedures of assessment for Lv1 (Level 1) and Lv2 (Level 2) criteria.•The roll damping coefficient and wave slope function required to obtain the spectrum of the effective relative roll angle, which are the most important factors in the Lv2 criterion calculation, were accurately implemented.•The calculation process was described in as much detail as possible based on actual ship data, and finally, it was confirmed that the ship's vulnerability criteria were passed at Lv1 and Lv2.•In particular, it can provide clues to predict the stability in advance in a dead ship condition in the event of a failure of an engine of the ship.