An overview about operational measures in the framework of Second Generation Intact Stability criteria

The Second Generation Intact Stability criteria (SGISc) addresses ship stability in waves, focusing on specific dynamic-based phenomena, i.e. parametric roll, pure loss of stability, dead ship condition, surf-riding and excessive accelerations. Their application is encouraged by IMO to assess their consistency and validity. Three assessment levels are defined to evaluate ship vulnerability during design stage, with the possibility to complement them by operational measures. After an introduction to SGISc operational measures, application cases are carried out for mega-yacht and a RO-RO passenger ship: the vulnerability levels (i.e. Level 1 and Level 2) and operational measures (i.e. operational limitation and operational guidance) are investigated and discussed.