Statutory Documents - MCA Publications - LY3 - The Large Commercial Yacht Code - 14B Structural Fire Protection - Vessels of 500GT and Over - 14B.2 - 14B.2.3 Main vertical zones and horizontal zones
14B.2.3 Main vertical zones and horizontal zones
14B.2.3.1 Hull, superstructure and deckhouses in way of accommodation and service spaces should be subdivided into main vertical zones by "A" class divisions. These divisions should have insulation values in accordance with tables 1 and 2.
14B.2.3.2 As far as practicable, the bulkheads forming the boundaries of the main vertical zones above the bulkhead deck should be in line with watertight subdivision bulkheads situated immediately below the bulkhead deck. The length and width of main vertical zones may be extended to a maximum of 48 m in order to bring the ends of main vertical zones to coincide with watertight subdivision 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 800 m2 on any deck. The length or width of a main vertical zone is the maximum distance between the furthermost points of the bulkheads bounding it.
14B.2.3.3 Such bulkheads should extend from deck to deck and to the shell or other boundaries.
14B.2.3.4 When a main vertical zone is subdivided by "A" class divisions for the purpose of providing an appropriate barrier between spaces protected and not protected by a sprinkler system, the divisions should be insulated in accordance with the fire insulation and integrity values given in tables 1 and 2.
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