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52. Structure
The hull, superstructure, structural bulkheads, decks and deckhouses shall be constructed of steel or other equivalent material, except that the crowns and casings of machinery spaces of Category A shall be constructed only of steel. Where any part of the structure is of aluminium alloy, the following requirements shall apply—
(a) the insulation of aluminium alloy components of “A” Class divisions or “B” Class divisions, and supports of such divisions, shall be such that the temperature of the structural core does not rise more than 200oC above the ambient temperature at any time during a standard fire test of 60 minutes duration in the case of an “A” Class division and 30 minutes duration in the case of a “B” Class division; and
(b) the insulation of aluminium alloy components of columns, stanchions and other structural members required to support lifeboat and liferaft stowage, launching and embarkation areas, shall be such that the temperature rise limitation specified in paragraph (a) shall apply for 60 minutes duration.

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53. Main vertical zones and horizontal zones
(1) The hull, superstructure and deckhouses of every ship to which this Part applies shall be subdivided by bulkheads consisting of “A” Class divisions into main vertical zones except in respect of special category spaces to which regulation 64 applies. The mean length of each zone on any one deck, above the bulkhead deck, shall not normally exceed 40 metres. Steps and recesses shall be kept to a minimum, but any which are necessary shall consist of “A” Class divisions. These divisions shall have insulation values in accordance with Table 1, Table 2, Table 3 and Table 4 of regulation 55.
(2) Any portions of such divisions which extend above the bulkhead deck shall, whenever possible, be in line with watertight subdivision bulkheads situated immediately below the bulkhead deck, and shall extend from deck to deck and to the ship’s shell and in the case of a deckhouse, to the external plating thereof.
(3) Where a main vertical zone is subdivided by horizontal “A” Class divisions into horizontal zones for the purpose of providing an appropriate barrier between sprinklered and non-sprinklered zones of the ship, the divisions shall extend between adjacent main vertical zone bulkheads and to the shell or exterior boundaries of the ship and shall have insulation and integrity values in accordance with Table 3 of regulation 55.
(4) In ships designed for special purposes, such as car or train services, where the provisions of main vertical zone bulkheads would conflict with the purpose for which the ship is intended, the Director may allow an equivalent means for controlling and limiting a fire to be substituted:
Provided that in a ship with special category spaces, any such space shall comply with the applicable provisions of regulation 64 and in so far as such compliance would be inconsistent with compliance with other requirements of this Part, the requirements of regulation 64 shall prevail.

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54. Bulkheads within a main vertical zone
(1) Every bulkhead within the accommodation spaces or service spaces of every ship to which this Part applies, not being a bulkhead required by these regulations to consist of an “A” Class division, shall consist of a “B” Class division or a “C” Class division as required by the Tables of regulation 55. All such divisions may be faced with combustible materials provided they comply with the requirements of regulation 61.
(2) All corridor bulkheads where not required to be “A” Class divisions shall be “B” Class divisions which shall extend from deck to deck except—
(a) when continuous “B” Class ceilings and/or linings are fitted on both sides of the bulkhead, the portion of the bulkhead behind the continuous ceiling or lining shall be of material which in thickness and composition meets the requirements of “B” Class divisions, but which is required to meet “B” Class fire integrity standards only so far as is reasonable and practicable in the opinion of the Director;
(b) in the case of a ship protected by an automatic sprinkler system complying with Schedule 11 to the Merchant Shipping (Safety) (Fire Appliances) (Ships Built On or After 25 May 1980 but Before 1 September 1984) Regulations (Cap. 369 sub. leg. X) the corridor bulkheads of “B” Class materials may terminate at a ceiling in the corridor, provided such a ceiling is of material which in thickness and composition meets the requirements of “B” Class divisions. Notwithstanding the requirements of regulation 55, such bulkheads and ceilings are required to meet “B” Class fire integrity standards only so far as is, in the opinion of the Director, reasonable and practicable. All doors and frames in such bulkheads shall be of non-combustible materials and shall be constructed and erected so as to provide substantial fire resistance to the satisfaction of the Director. (E.R. 3 of 2022)
(3) Every bulkhead required to be a “B” Class division, except a corridor bulkhead, shall extend from deck to deck and to the shell or other boundaries unless continuous “B” Class ceilings and/or linings are fitted on both sides of the bulkhead, in which case the bulkhead may terminate at the continuous ceiling or lining.

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68. Passenger ships carrying not more than 36 passengers
Every ship to which this Part applies, being a ship carrying not more than 36 passengers shall comply with regulation 52 except that any reference to steel or other equivalent material, shall mean that the fire integrity and insulation standards of the structure shall be in accordance with Table 1 and Table 2 of regulation 71.

69. Main vertical zones and horizontal zones
(1) The hull, superstructure and deckhouses in the way of accommodation and service spaces of every ship to which this Part applies shall be subdivided by bulkheads consisting of “A” Class divisions into main vertical zones. The mean length of each zone on any one deck above the bulkhead deck shall not in general exceed 40 metres. Steps and recesses shall be kept to a minimum, but any which are necessary shall consist of “A” Class divisions. These divisions shall have insulation values in accordance with Table 1 and Table 2 of regulation 71, except that where insulation values of “B-0” and “C” appear in Table 1 the value of “A-0” shall be substituted.
(2) Any portions of such divisions which extend above the bulkhead deck shall, whenever possible, be in line with watertight subdivision bulkheads situated immediately below the bulkhead deck and shall extend from deck to deck and to the ship’s shell and, in the case of a deckhouse, to the external plating thereof.
(3) Where a main vertical zone is subdivided by horizontal “A” Class divisions into horizontal zones for the purpose of providing an appropriate barrier between sprinklered and non-sprinklered zones of the ship, the divisions shall extend between adjacent main vertical zone bulkheads and to the shell or exterior boundaries of the ship and shall be insulated in accordance with the fire insulation and integrity values given in Table 2 of regulation 71.
(4) In ships designed for special purposes, such as car or train services, where the provision of main vertical zone bulkheads would conflict with the purpose for which the ship is intended, the Director may allow an equivalent means for controlling and limiting a fire to be substituted:
Provided that in a ship with special category spaces, any such space shall comply with the applicable provisions of regulation 80 and in so far as such compliance would be inconsistent with compliance with other requirements of this Part, the requirements of regulation 80 shall prevail.