Section 2 Definitions

2.1.1  Non-combustible material means a material which neither burns nor gives off flammable vapours in sufficient quantity for self-ignition when heated to approximately 750°C, according to an established test procedure, see IMO International Code for Application of Fire Test Procedures (FTP Code), Annex 1, Part 1. Any other material is a combustible material.

2.1.2  Steel or other equivalent material. Where the words 'steel or other equivalent material' occur, 'equivalent material' means any non-combustible material which, by itself, or due to insulation provided, has structural and integrity properties equivalent to steel at the end of the applicable fire exposure to the standard fire test (e.g. aluminium with appropriate insulation).

2.1.3  Alternative forms of construction means any combustible material may be accepted if it can be demonstrated that the material, which by itself or due to insulation provided has structural and fire integrity properties equivalent to `A' or `B' class divisions, or steel, as applicable, at the end of the applicable fire exposure to the standard fire test.

2.2.1 A standard fire test is one in which the specimens of the relevant bulkheads and decks are exposed in a test furnace to temperatures corresponding approximately to the standard time-temperature curve. The test methods are to be in accordance with the IMO FTP Code, Annex 1, Part 3 - Test for “A”, “B” and “F” Class Divisions.

2.3.1  Low flame spread means that the surface thus described will adequately restrict the spread of flame, having regard to the risk of fire in the spaces concerned, this being determined by an acceptable test procedure, see IMO FTP Code, Annex 1, Part 5 - Test for Surface Flammability

2.3.2  Not readily ignitable means that the surface thus described will not continue to burn for more than 20 seconds after the removal of a suitable impinging test flame.

2.4.1  'A' Class divisions are those divisions formed by bulkheads and decks and:

1. Are to be constructed of steel or other equivalent material.

2. Are to be suitably stiffened.

3. Are to be so constructed as to be capable of preventing the passage of smoke and flame up to the end of the one-hour standard fire test, see Pt 17, Ch 1, 2.2 Fire test 2.2.1.

4. Are to be insulated with approved non-combustible materials such that the average temperature of the unexposed side will not rise more than 140°C above the original temperature, nor will the temperature, at any one point, including any joint, rise more than 180°C above the original temperature, within the time listed below:

   Class `A-60' Class `A-30' Class `A-15' Class `A-0'

   60 minutes. 30 minutes. 15 minutes. 0 minutes.

5. may be required to demonstrate that they meet the above requirements for integrity and temperature rise, through a test.

2.4.2  'B' Class divisions are those divisions formed by bulkheads, decks, ceilings or linings and:

1. Are to be so constructed as to be capable of preventing the passage of flame to the end of the first half hour of the standard fire test, see IMO FTP Code, Annex 1, Part 3.

2. Are to be insulated such that the average temperature of the unexposed side will not rise more than 140°C above the original temperature, nor will the temperature at any one point, including any joint, rise more than 225°C above the original temperature, within the time listed below:

   Class `B-15' Class `B-0'

   15 minutes. 0 minutes.

3. Are to be constructed of approved non-combustible materials and all materials entering into the construction and erection of `B' Class divisions are to be non-combustible, except where permitted by other requirements of this Chapter.

4. May be required to ensure that they meet the above requirements for integrity and temperature rise through a test of a prototype division.

2.4.3  'C' Class divisions are divisions to be constructed of approved non-combustible materials. They need to meet neither requirements relative to the passage of smoke and flame nor limitations relative to the temperature rise. Combustible veneers are permitted provided they meet other requirements of this Chapter.

2.4.4  Continuous `B' Class ceilings or linings are those `B' Class ceilings or linings which terminate only at an `A' or `B' Class division.

2.4.5  Accommodation spaces are those spaces used for public spaces, corridors, lavatories, cabins, offices, hospitals, cinemas, games and hobbies rooms, pantries containing no cooking appliances and similar spaces.

2.4.6  Service spaces are those used for galleys, pantries containing cooking appliances, stores, mail and specie rooms, store rooms, lockers, workshops other than those forming part of the machinery spaces and similar spaces and trunks to such spaces.

2.4.7  Cargo spaces are all spaces used for cargo (including cargo oil tanks) and trunks to such spaces.

2.4.8  Machinery spaces of Category A are those spaces and trunks to such spaces which contain:

1. internal combustion machinery used for main propulsion; or

2. internal combustion machinery used for purposes other than main propulsion where such machinery has in the aggregate a total power output of not less than 375 kW; or

3. any oil-fired boiler or fuel oil unit.

2.4.9  Machinery spaces are all machinery spaces of Category `A' and all other spaces containing propelling machinery, boilers, fuel oil units, steam and internal combustion engines, generators and major electrical machinery, oil filling stations, refrigerating, stabilising, ventilation and air conditioning machinery, and similar spaces; and trunks to such spaces.

2.4.10  Control stations are those spaces in which the craft's radio or main navigating equipment or the emergency source of power is located or where the fire recording or fire-control equipment is centralised.

2.4.11  Cargo area is that part of the ship that contains cargo tanks, slop tanks and cargo pump rooms including pump rooms, cofferdams, ballast and void spaces adjacent to cargo tanks and also deck areas throughout the entire length and breadth of the part of the craft over the above-mentioned spaces.

2.4.12  Main vertical zones are those sections into which the hull, superstructure and deck houses are divided by `A' Class divisions, the mean length and width of which on any one deck does not, in general, exceed 48 m.

2.5.1  Fuel oil unit is the equipment used for the preparation of fuel oil for delivery to an oil-fired boiler, or equipment used for the preparation for delivery of heated oil to an internal combustion engine, and includes any oil pressure pumps, filters and heaters dealing with oil at a pressure of more than 1,8 bar (1,8 kgf/cm²) gauge.

2.6.1 For the purpose of this Part the definitions of craft types given in Pt 17, Ch 1, 2.6 Craft types 2.6.2 and Pt 17, Ch 1, 2.6 Craft types 2.6.3 apply.

2.6.2 A passenger craft is a craft which carries more than twelve passengers.

2.6.3 A yacht is a craft in commercial or non-commercial use for sport or pleasure and may be propelled mechanically, by sail or by a combination of both.