Passenger ships – Longitudinal extent of damage; | 3m + 3% of L or, 11m whichever is least. Where the required factor of subdivision is 0.33 or less the longitudinal extent must be increased to include flooding of any three consecutive compartments. |
Passenger ships – Transverse extent of damage; | 20% of B measured inboard from the ship’s side at right angles to the centreline at the level of the deepest subdivision load waterline taken parallel to the keel |
Passenger ships – Vertical extent of damage; | From the baseline upwards without limit |
Any other damage; | If any damage of a lesser extent would may cause a more severe condition regarding heel or loss of metacentric height, such damage shall be assumed for the purpose of the calculation |
Passenger ships – When does the damage stability apply?; | In the final stage after damage and after equalisation |
Passenger ships damage stability – Residual area under curve; | At least 0.015mr measured from the angle of equilibrium to the lesser of; – Angle of flooding – 22 deg from upright (one flooded compartment) or 27 deg from upright (two or more flooded compartments) |
Passenger ships damage stability – Range of positive stability; | At least 15 deg beyond angle of equilibrium |
Passenger ships damage stability -Maximum GZ; | Residual righting lever (GZ) value to occur within the range of positive stability when determined by the formula; GZ(m) = heeling moment / displacement (+ 0.04) When the heeling moment is taken as the greater value of any one of the following effects; – Crowding of passengers to one side of the ship – Launching of all fully loaded, davit launched survival craft on one side of the ship – Pressure of wind on the side of the ship In no case shall the GZ value so determined be less than 0.1m |
Passenger ships damage stability – Assumed flooding; | Sufficient intact stability in all conditions to withstand flooding of any 1 main compartment or; -Where factor of subdivision is 0.33 – 0.5 to withstand the flooding of any 2 adjacent compartments or; – Where factor of subdivision os 0.33 or less to withst and the flooding of any 3 adjacent main compartments |
Passenger ships; Define ‘Margin Line’ | A line drawn at least 76mm below the upper surface of the the bulkhead deck at the side of a subdivided ship |
Passenger ships; Define ‘Bulkhead Deck’ | The uppermost deck to which the transverse watertight bulkheads are carried |
Passenger ships; Define ‘Factor of Subdivision’ | Is a number with a maximum value of 1. It varies inversely as the length of the vessel and number of passengers increase. i.e. Longer vessel, more passengers = Smaller F |
Passenger ships; Define ‘Permissible length’ | Equal to the Floodable length x Factor of Subdivision (F)The The maximum length of a compartment shall not exceed it’s ‘Permissible length’ |
Passenger ships; Define ‘Floodable length’ | Maximum length of that portion having it’s centre at a given point which can be flooded without submerging any part of the margin line when the ship has no list |