(1) The hull, superstructure, structural bulkheads,
decks and deckhouses shall be constructed of steel or other equivalent
material except as otherwise specified in paragraph (4).
(2) The insulation of aluminum alloy components
of "A" or "B" class divisions, except structures which, in the opinion
of the Administration, are non-load bearing, shall be such that the
temperature of the structural core does not rise more than 200°C
above the ambient temperature at any time during the applicable fire
exposure to the standard fire test
(3) Special attention shall be given to the insulation
of aluminium alloy components of columns, stanchions and other structural
members required to support survival craft stowage, launching and
embarkation areas, and "A" and "B" class divisions, to ensure:
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(a) that for such members supporting survival
craft areas and "A" class divisions the temperature rise limitation
specified in paragraph (2) shall apply at the end of one hour; and
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(b) that for such members required to support
"B" class divisions, the temperature rise limitation specified in
paragraph (2) shall apply at the end of one half-hour.
(4) Crowns and casings of machinery spaces of
category A shall be of steel construction adequately insulated and
any openings therein shall be suitably arranged and protected to prevent
the spread of fire.