Ro-Ro Vehicle Deck Fire Water Demand, Drainage & Stability Tool

2026 reference basis: MSC.1/Circ.1430/Rev.3 is the current IMO guideline for fixed water-based fire-fighting systems in ro-ro and special-category spaces. Its prescriptive design bands use 6.5 / 6.5 / 5 L/min/m² for wet / dry / deluge systems at free heights up to 2.5 m; 15 / 15 / 10 L/min/m² above 2.5 m to 6.5 m; and 20 / 20 / 15 L/min/m² above 6.5 m to 10 m. Wet systems use a 280 m² design area; dry/pre-action systems use 280 m² at the lowest height band and 365 m² above 2.5 m; prescriptive deluge design covers two adjacent 20 m longitudinal sections across the protected breadth. MSC.1/Circ.1320 and relevant SOLAS II-2/20 drainage provisions use a 125% capacity screen for the fixed water-system pump flow plus required fire hoses and require free-surface stability effects to be considered where accumulation cannot be prevented. SOLAS amendments in force from 1 January 2026 strengthen detection, section identification and, for passenger ships, video monitoring; existing passenger ships have a later transition for specified video-monitoring provisions.