Part B - Requirements for Passenger Craft

  7.11.1 For category B craft, the public spaces should be divided into zones according to the following:

• .1 The craft should be divided into at least two zones. The mean length of each zone should not exceed 40 m.

• .2 For the occupants of each zone there should be an alternative safe area to which it is possible to escape in case of fire. The alternative safe area should be separated from other passenger zones by smoke-tight divisions of non-combustible materials or fire-restricting materials extending from deck to deck. The alternative safe area can be another passenger zone provided the additional number of passengers may be accommodated in an emergency.

• .3 The alternative safe area should, as far as practicable, be located adjacent to the passenger zone it is intended to serve. There should be at least two exits from each passenger zone, located as far away from each other as possible, leading to the alternative safe area. Escape routes should be provided to enable all passengers and crew to be safely evacuated from the alternative safe area.

  7.11.2 Category A craft need not be divided into zones.

  7.11.3 Control stations, life-saving appliance stowage positions, escape routes and places of embarkation into survival craft should not, as far as practicable, be located adjacent to any major or moderate fire hazard areas.

 The ventilation fans of each zone in the accommodation spaces should also be capable of being independently controlled from a continuously manned control station

  7.13.1 Public spaces and service spaces, storage rooms other than those containing flammable liquids, and similar spaces should be protected by a fixed sprinkler system meeting a standard developed by the Organization. Manually operated sprinkler systems should be divided into sections of appropriate size, and the valves for each section, start of sprinkler pump(s) and alarms should be operable from two spaces separated as widely as possible, one of which should be a continuously manned control station. In category B craft, no section of the system should serve more than one of the zones required in 7.11.

  7.13.2 Plans of the system should be displayed at each operating station. Suitable arrangements should be made for the drainage of water discharged when the system is activated.