1 Definitions relating to Part B (R 2)

Subdivision load line is the waterline used in determining the subdivision of the ship. Deepest subdivision load line is the waterline which corresponds to the greatest draught permitted by the subdivision requirements which are applicable. Length of the ship is the length measured between perpendiculars taken at the extremities of the deepest subdivision load line. Breadth of the ship is the extreme width from outside of frame to outside of frame at or below the deepest subdivision load line. Draught is the vertical distance from the moulded base line amidships to the subdivision load line in question. Deadweight is the difference in tonnes between the displacement of a ship in water of a specific gravity of 1,025 at the load waterline corresponding to the assigned summer freeboard and the lightweight of the ship. Lightweight is the displacement of a ship in tonnes without cargo, fuel, lubricating oil, ballast water, fresh water and feedwater in tanks, consumable stores, and passengers and crew and their effects. Bulkhead deck is the uppermost deck up to which the transverse watertight bulkheads are carried. Margin line is a line drawn at least 76 mm below the upper surface of the bulkhead deck at side. Permeability of a space is the percentage of that space which can be occupied by water. The volume of a space which extends above the margin line shall be measured only to the height of that line. Machinery space is to be taken as extending from the moulded base line to the margin line and between the extreme main transverse watertight bulkheads, bounding the spaces containing the main and auxiliary propulsion machinery, and boilers serving the needs of propulsion. Passenger spaces are those spaces which are provided for the accommodation and use of passengers, excluding baggage, store, provision and mail rooms. Watertight in relation to structure means capable of preventing the passage of water through the structure in any direction under the head of water likely to occur in the intact or damage condition. Weathertight means that water will not penetrate into the ship in any sea conditions. Ro-ro passenger ship means a passenger ship with ro-ro cargo spaces or special category spaces as defined in Regulation II-2/A/2.

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Source: EUR-Lex (Cellar) · retrieved 2026-11-10 · Text as adopted (Official Journal); later amendments are not incorporated in this text.