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15. Means of closing openings in watertight bulkheads, etc.
(1) In every ship of Class I, Class II or Class II(A) efficient means shall be provided for closing and making watertight all openings in bulkheads and other structures required by these regulations to be watertight.
(2) Every door fitted to any such opening shall be a sliding watertight door:

Provided that, in any ship of Class I, Class II or Class II(A) hinged watertight doors may be fitted in the following positions— (L.N. 157 of 2001)
(a) in passenger, crew and working spaces above any deck the underside of which at its lowest point is at least 2.13 metres above the deepest subdivision load waterline; and (E.R. 3 of 2022)
(b) in any bulkhead, not being a collision bulkhead, which divides 2 cargo between-deck spaces.

(3) Sliding watertight doors may have a horizontal or vertical motion and shall be either—
(a) hand operated only; or
(b) power operated, when so required by these regulations, as well as hand operated.
(4) Hinged watertight doors fitted in accordance with subregulation (2)(a) shall be fitted with catches, or similar quick action closing devices, capable of being worked from each side of the bulkhead in which the door is fitted.
(5) Where sliding watertight doors are fitted in the position referred to in subregulation (2)(b) such doors shall not be fitted with remote control devices, and every watertight door which is fitted in such a position and which is accessible while the ship is at sea, shall be fitted with efficient locking arrangements.
(6) Every door required by these regulations to be watertight shall be capable of being secured by means other than bolts and of being closed by means other than by gravity.
(7) In every ship of Class I, Class II or Class II(A) watertight doors fitted in bulkheads between permanent and reserve bunkers, other than the doors referred to in regulation 14(4), shall always be accessible.

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17. Watertight doors: signals and communications
(1) Every sliding watertight door fitted in a ship of Class I, Class II or Class II(A) shall be connected with an indicator at each position from which the door may be closed, other than at the door itself, showing when the door is open and when it is closed.
(2) There shall be provided in connection with every such door which is operated by power a means of giving an audible warning signal at the door itself when the door is about to be closed. The arrangement shall be such that one movement of the operating handle at the position from which the door is about to be closed will be sufficient to sound the signal and to close the door, the signal preceding the movement of the door by an interval sufficient to allow the movement of persons and articles away from the door. The signal shall continue to sound until the door is completely closed.
(3) If any door required by these regulations to be watertight is not capable of being operated from a single position on the navigating bridge, means of communication by telegraph, telephone or any other direct means shall be provided whereby the officer of the watch may communicate with the person responsible for the closing of the door.

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18. Construction of watertight doors
(1) Every door required by these regulations to be watertight shall be of such design, material and construction as will maintain the integrity of the watertight bulkhead in which it is fitted. Any such door giving direct access to any space which may contain bunker coal shall, together with its frame, be made of cast or mild steel. Any such door in any other position shall, together with its frame, be made of cast or mild steel or cast iron.
(2) Every sliding watertight door shall be fitted with rubbing faces of brass or similar material which may be fitted either on the door itself or on the door frame, and which, if they are less than one inch in width, shall be fitted in recesses.
(3) If screw gear is used for operating such a door, the screw shall work in a nut of suitable metal which is resistant to corrosion.
(4) The frame of every vertically sliding watertight door shall have no groove at the bottom thereof in which dirt may lodge. The bottom of such a frame, if it is of skeleton form, shall be so arranged that dirt cannot lodge therein. The bottom edge of every such door shall be tapered or bevelled.
(5) Every vertically sliding watertight door which is operated by power shall be so designed and fitted that, if the power supply ceases, there shall be no danger of the door dropping.
(6) Every horizontally sliding watertight door shall be so installed as to prevent its moving if the ship rolls, and if necessary a clip or other suitable device shall be provided for that purpose. The device shall not interfere with the closing of the door when the door is required to be closed.
(7) The frame of every watertight door shall be properly fitted to the bulkhead in which the door is situated, and the jointing material between the frame and the bulkhead shall be of a type which will not deteriorate or be injured by heat.
(8) Every watertight door, being a coal-bunker door, shall be provided with screens or other devices to prevent coal from interfering with its closing.

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20. Side and other openings above the margin line
(1) In every ship to which these regulations apply sidescuttles, windows, gangway ports, cargo ports, bunkering ports and other openings in the shell above the margin line and their means of closing shall be of efficient design and construction and of sufficient strength having regard to the spaces in which they are fitted and to their positions relative to the deepest subdivision load waterline and to the intended service of the ship.
(2) In every ship to which these regulations apply efficiently hinged deadlights, which can be easily closed and secured watertight, shall be provided for all sidescuttles to spaces below the first deck above the bulkhead deck and, in a ship which is marked with a summer load line, to all sidescuttles in an enclosed superstructure.
(3) In every ship to which these regulations apply and which is marked with a summer load line, each discharge led through the shell above the margin line from a space below the freeboard deck or from within any enclosed superstructure or from within any deckhouse on the freeboard deck which is fitted with weathertight doors, shall be fitted in compliance with the requirements of regulation 19(5)(b)(i), (ii) or (c)(iii) with efficient means for preventing water from passing inboard.

21. Weather deck
In every ship to which this Part applies the bulkhead deck or a deck above the bulkhead deck shall be weathertight. All openings in an exposed weathertight deck shall have coamings of adequate height and strength and shall be provided with efficient and rapid means of closing so as to make them weathertight. Freeing ports, open rails and scuppers shall be fitted as necessary for rapidly clearing the weather deck of water under all weather conditions.

22. Partial subdivision above the margin line
In every ship to which this Part applies all reasonable and practicable measures shall be taken to limit where necessary the entry and spread of water above the bulkhead deck, which measures may include partial bulkheads or webs. Where such partial watertight bulkheads and webs are fitted on the bulkhead decks, above or in the immediate vicinity of main subdivision bulkheads, they shall have watertight shell and bulkhead deck connections so as to restrict the flow of water along the deck when the ship is heeled in a damaged condition. Where such partial watertight bulkheads do not coincide with the bulkheads below, the bulkhead deck between shall be made effectively watertight.