Ship Stability Analysis Safety Checklist PDF

Ship stability analysis evaluates a vessel’s ability to return to equilibrium after being disturbed by external forces such as wind, waves, or asymmetric loading. The safety checklist operationalizes theoretical hydrostatic and hydrodynamic principles into actionable verification points—including draft readings, KG (center of gravity) and KM (metacentric height) calculations, free surface moment correction, and compliance with minimum GM requirements across loading conditions (light, ballast, full, and damaged). It integrates regulatory thresholds (e.g., IMO Weather Criterion, angle of vanishing stability ≥ 15°, area under GZ curve ≥ 0.055 m·rad) and mandates documentation of load distribution, tank sounding data, and stability booklet cross-references. Practically, the checklist is used during pre-departure inspections, dry-dock stability assessments, cargo operations on bulk carriers or tankers, and post-modification certification—requiring sign-off by the master, chief officer, and sometimes a certified naval architect or classification society surveyor. Its effectiveness hinges on accurate input data, consistent units (metric/SI), and traceability to approved stability documentation (e.g., approved Hydrostatic Curves, Cross Curves of Stability, and Damage Stability Booklet).