.3 bulkhead not gastight (3.3.2);

Especially designed or prepared hermetically sealed cylindrical vessels greater than 300 mm (12 in) in diameter and greater than 900 mm (35 in) in length, or rectangular vessels of comparable dimensions, which have an inlet connection and two outlet connections all of which are greater than 50 mm (2 in) in diameter, for containing the gaseous diffusion barrier, made of or lined with UF6-resistant materials and designed for horizontal or vertical installation.

Especially designed or prepared hermetically sealed cylindrical vessels greater than 300 mm (12") in diameter and greater than 900 mm (35") in length, or rectangular vessels of comparable dimensions, which have an inlet connection and two outlet connections all of which are greater than 50 mm (2") in diameter, for containing the gaseous diffusion barrier, made of or lined with UF6-resistant materials and designed for horizontal or vertical installation.

Manholes are permitted, however, in bulkheads other than the collision bulkhead, on condition that they are bolted in a watertight manner.

Accommodation must be separated from the engine and boiler rooms by gas-tight bulkheads and directly accessible from the deck.

That the policy laid down in the ship's operational instructions for the sub-division watertight doors is being followed.

Ship-borne lighters shall also comply with the following construction requirements: (a) The transverse watertight bulkheads referred to in 2.02.3 are not required if the bows are capable of withstanding an impact at least 2 75 times that required in the collision bulkhead of an inland waterway vessel of the same draught built to the specifications of a classification society approved by the Member State which has to issue the certificate.

An examination of the log book to ensure that the entries are being made regarding the closing of the bow, stern and other watertight and weather-tight doors, drills for sub-division watertight doors, testing of steering gears, etc. Also that draughts, freeboard and stability are being recorded as well as the common working language for the crew.

Where the partial watertight bulkhead does not line up with the bulkhead below, the bulkhead deck between shall be made effectively watertight..

Bulkhead not gastight (3.3.2).

In any case, a thorough inspection of the watertight bulkheads shall be carried out..

1 Each watertight subdivision bulkhead, whether transverse or longitudinal, shall be constructed in such a manner that it shall be capable of supporting, with a proper margin of resistance, the pressure due to the maximum head of water which it might have to sustain in the event of damage to the ship but at least the pressure due to a head of water up to the margin line.

12 Construction and initial testing of watertight bulkheads, etc. (R 14)

17-1 Watertight integrity from the ro-ro deck (bulkhead deck) to spaces below (R 20-2)

Valves not forming part of a piping system shall not be permitted in watertight subdivision bulkheads..

Emergency doors and other emergency exits must be as fire-resistant as the bulkheads.

2 All watertight doors in main transverse bulkheads, in use at sea, shall be operated daily..

Every ship shall be subdivided by bulkheads, which shall be watertight up to the bulkhead deck, into watertight compartments the maximum length of which shall be calculated according to the specific requirements given below.

4a Fire doors in main vertical zone bulkheads, galley boundaries and stairway enclosures other than power-operated watertight doors and those which are normally locked, shall satisfy the following requirements:.

That space between the forward bulkhead and the instrument panel which is located higher than the bottom edge of the instrument panel is not subject to the specifications of point 5.3.

As far as practicable, electrical equipment and components for watertight doors shall be situated above the bulkhead deck and outside hazardous areas and spaces..

1 The number of openings in watertight bulkheads shall be reduced to the minimum compatible with the design and proper working of the ship;

Where pipes, scuppers, electrical cables, etc., are carried through watertight subdivision bulkheads, arrangements shall be made to ensure the watertight integrity of the bulkheads..

Where frames or beams pass through a watertight deck or bulkhead, such deck or bulkhead shall be made structurally watertight without the use of wood or cement..

2 in watertight transverse bulkheads dividing a cargo space from an adjoining cargo space, except as provided for in paragraph.10.1 and in regulation 14..

The number of openings in watertight bulkheads, as required by regulation 1(3), shall be reduced to the minimum compatible with the general arrangements and operational needs of the vessel;

4 Fire doors in main vertical zone bulkheads and stairways enclosures other than power-operated sliding watertight doors and doors normally locked, shall satisfy the following requirements:.

The positioning of watertight doors and their controls shall be such that if the ship sustains damage within one fifth of the breadth of the ship, such distance being measured at right angles to the centreline at the level of the deepest subdivision load line, the operation of the watertight doors clear of the damaged portion of the ship is not impaired..

1 Where in a portion or portions of a ship the watertight bulkheads are carried to a higher deck than in the remainder of the ship and it is desired to take advantage of this higher extension of the bulkheads in calculating the floodable length, separate margin lines may be used for each such portion of the ship provided that:.

2 As far as practicable, the bulkheads forming the boundaries of the main vertical zones above the bulkhead deck shall be in line with watertight subdivision bulkheads situated immediately below the bulkhead deck.

Where it is proposed to fit decks, inner skins or longitudinal bulkheads of sufficient tightness to seriously restrict the flow of water, proper consideration is to be given to such restrictions in the calculations.

In ships where the total number of watertight doors is not more than two and these doors are situated in the machinery space or in the bulkheads bounding such space, the Administration of the flag State may allow these two doors to be hand-operated only.

If the Administration of the flag State is satisfied that such doors are essential, watertight doors of satisfactory construction may be fitted in watertight bulkheads dividing cargo between deck spaces.

Access doors shall open outwards, and bulkheads and decks including doors and other means of closing any opening therein, which form the boundaries between such rooms and adjoining enclosed spaces shall be gastight.

Access doors shall open outwards and bulkheads and decks including doors and other means of closing any opening therein, which form boundaries between such rooms and adjacent enclosed spaces, shall be gastight.

2 In the accommodation, service and machinery spaces the number and position of the hydrants shall be such that the requirements of paragraph.5.1 may be complied with when all watertight doors and all doors in main vertical zone bulkheads are closed..

5 Efficient inside deadlights, so arranged that they can be easily and effectively closed and secured watertight, shall be provided for all sidescuttles to spaces below the first deck above the bulkhead deck.

The electrical power required for power-operated sliding watertight doors shall be supplied from the emergency switchboard either directly or by a dedicated distribution board situated above the bulkhead deck;

1 Below the bulkhead deck two means of escape, at least one of which shall be independent of watertight doors, shall be provided from each watertight compartment or similarly restricted space or group of spaces.

3 Where a portion of an assumed margin line is appreciably below the deck to which bulkheads are carried, the Administration of the flag State may permit a limited relaxation in the watertightness of those portions of the bulkheads which are above the margin line and immediately under the higher deck.

Watertight door controls, including hydraulic piping and electric cables, shall be kept as close as practicable to the bulkhead in which the doors are fitted, in order to minimise the likelihood of them being involved in any damage which the ship may sustain.

Lead or other heat sensitive materials shall not be used in systems which penetrate watertight subdivision bulkheads, where deterioration of such systems in the event of fire would impair the watertight integrity of the bulkheads..

where vehicle ramps are installed to give access to spaces below the bulkhead deck, their openings shall be able to be closed weathertight to prevent ingress of water below, alarmed and indicated to the navigation bridge;.

The length and width of main vertical zones may be extended to a maximum of 48 metres in order to bring the ends of main vertical zones to coincide with subdivision watertight bulkheads or in order to accommodate a large public space extending for the whole length of the main vertical zone provided that the total area of the main vertical zone is not greater than 1600 m2 on any deck.

When partial watertight bulkheads and webs are fitted on the bulkhead deck, 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 in a heeled damaged condition.

2 In case of a ship not having a continuous bulkhead deck, the floodable length at any point may be determined to an assumed continuous margin line which at no point is less than 76 mm below the top of the deck at side to which the bulkheads concerned and the shell are carried watertight..

the Administration of the flag State may permit the fitting of particular accesses to spaces below the bulkhead deck provided they are necessary for the essential working of the ship, e.g. movement of machinery and stores, subject to such accesses being made watertight, alarmed and indicated to the navigation bridge;.

There shall be permanently exhibited, for the guidance of the officer in charge of the ship, plans showing clearly for each deck and hold the boundaries of the watertight compartments, the openings therein with the means of closure and position of any controls thereof, and the arrangements for the correction of any list due to flooding.

The Administration of the flag State may permit not more than one power-operated sliding watertight door in each main transverse bulkhead larger than those specified in paragraph.7.1.2 to be substituted for these portable plates, provided these doors are closed before the ship leaves the port and remain closed during navigation except in case of urgent necessity at the discretion of the master.

Where in a between-deck, the sills of any of the sidescuttles referred to in paragraph.2.3 are below a line drawn parallel to the bulkhead deck at side and having its lowest point 1,4 metres plus 2,5 % of the breadth of the ship above the water when the ship departs from any port, all the sidescuttles in that between-deck shall be closed watertight and locked before the ship leaves port, and they shall not be opened before the ship arrives at the next port.