Page 363 - Ship Construction.DJ Eyres 6Ed

Ch32-H8070.fm Page 352 Wednesday, October 18, 2006 7:06 AM

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Structural Fire Protection

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Of the requirements of the International Conventions for the Safety of Life
งานห้องสมุด ศูนย์ฝกพาณิชย์นาวี
at Sea those having a particular influence on ship construction are the
requirements relating to structural fire protection. Varying requirements
for vessels engaged in international voyages are given for passenger ships
carrying more than thirty-six passengers, passenger ships carrying not more
than thirty-six passengers, cargo ships and tankers.

Requirements

Ships carrying more than thirty-six passengers are required to have accom-
ึ
modation spaces and main divisional bulkheads and decks which are gen-
erally of incombustible material in association with either an automatic fire
detection and alarm system or an automatic sprinkler and alarm system.
The hull, superstructure, and deckhouses are subdivided by ‘A’ class divi-
sions into main vertical zones the length of which on any one deck should
not exceed 40 m. Main horizontal zones of ‘A’ class divisions are fitted to
provide a barrier between sprinklered and non-sprinklered zones of the
ship. Bulkheads within the main vertical zones are required to be ‘A’, ‘B’ or
‘C’ class divisions depending on the fire risk of the adjoining spaces and
whether adjoining spaces are within sprinkler or non-sprinkler zones.
Passenger vessels carrying not more than thirty-six passengers are
required to have the hull, superstructure and deckhouses subdivided into
main vertical zones by ‘A’ class divisions. The accommodation and service
spaces are to be protected either by all enclosure bulkheads within the
space being of at least ‘B’ class divisions or only the corridor bulkheads
being of at least ‘B’ class divisions where an approved automatic fire detec-
tion and alarm system is installed.
Cargo ships exceeding 500 gross tonnage are generally to be constructed
of steel or equivalent material and to be fitted with one of the following
methods of fire protection in accommodation and service spaces.

‘Method Ic’ All internal divisional bulkheads constructed of non-
combustible ‘B’ or ‘C’ class divisions and no installation of an automatic
sprinkler, fire detection and alarm system in the accommodation and