Regulation 58 - Fire integrity of bulkheads and decks

• 1 If a space is divided into two (or more) smaller spaces so that these new spaces form enclosed spaces (e.g. a cabinet built in a mess room, a store room built in a mess room), then these new enclosed spaces should be surrounded by fire-resistant bulkheads and decks in accordance with this regulation. However, if the separating bulkheads of such spaces have at least 30% openings, then these spaces are not considered as separate spaces. (See also interpretation 1 of regulations II-2/26.2 and 44.2).

• 2 Regarding enclosed promenades, reference is made to interpretation 2 of regulations II-2/26.2 and 44.2.

• 1 In case a space has the special characters of two or more space categories of this regulation, the insulation values of the divisions of such a space should be the highest for the space categories concerned.

• 2 A separation made by wire mesh between two portions of a space is not considered a division in applying this regulation.

 (See also interpretations of regulations II-2/26.2.2 and 44.2.2).

 A totally enclosed emergency escape trunk belongs to the space category (4). (See also interpretations of regulations II-2/26.2.2(4) and 44.2.2(4)).

 Electrical equipment rooms (auto-telephone, exchange, air-conditioning duct spaces) are also category (7) spaces. (See also interpretation of regulation 44.2.2(7)).

 See interpretation of regulation II-2/26.2.2(8), concerning sauna arrangements, where in interpretation 2 the space categories should be (5), (7) and (10).

 The required division of steel between control stations and open decks may in the case of an emergency generator be provided with openings for intake of combustion air to the diesel engine and for intake of cooling air in the case of an air cooled diesel engine. These openings need not be fitted with means for closure for fire integrity purposes, unless a fixed gas fire-fighting system for the emergency generator space is fitted. (See also interpretation of table 44.1).

 Where an asterisk appears in table 2 of regulation II-2/58, the deck is required to be of steel or other equivalent material but is not required to be of "A" class standard. However, where such a deck, except an open deck, is penetrated for the passage of electric cables, pipes and vent ducts, such penetrations should be made tight to prevent the passage of flame and smoke. (See also interpretation of table 44.2).

 For the definition of "machinery spaces having little or no fire risk", see the interpretations of regulation II-2/26.2.2 (10).

 Continuous "B" class ceilings and linings may be accepted as contributing to the required insulation of a division (combination of steel deck or bulkhead and ceiling or lining), provided that they are fire tested in accordance with the applicable fire test procedure (e.g. resolution A.754 (18)).