Artikel 70

(1) Where trunks or ducts serve spaces on both sides of “A” Class bulkheads or decks, dampers shall be fitted so as to prevent the spread of fire and smoke between compartments. Manual dampers shall be operable from both sides of the bulkhead or the deck. Where the trunks or ducts with a free cross-sectional area exceeding 0.02 square metres pass through “A” Class bulkheads or decks, automatic self-closing dampers shall be fitted. Trunks serving compartments situated only on one side of such bulkheads shall comply with paragraph (2)(b).
(2) (a) Ventilation ducts shall be of non-combustible material. Short ducts, however, not generally exceeding 2 metres in length and with a cross section not exceeding 0.02 square metres need not be non-combustible, subject to the following conditions: (i) these ducts shall be of a material which, to the satisfaction of the Administration, has a low fire risk;
(ii) they may only be used at the end of the ventilation device; and
(iii) they shall not be situated less than 600 millimetres, measured along the duct, from an opening in an “A” or “B” Class division including continuous “B” Class ceilings.
(i) these ducts shall be of a material which, to the satisfaction of the Administration, has a low fire risk;
(ii) they may only be used at the end of the ventilation device; and
(iii) they shall not be situated less than 600 millimetres, measured along the duct, from an opening in an “A” or “B” Class division including continuous “B” Class ceilings.
(b) Where the ventilation ducts with a free cross-sectional area exceeding 0,02 square metres pass through “A” Class bulkheads or decks, the opening shall be lined with a steel sheet sleeve unless the ducts passing through the bulkheads or decks are of steel in the vicinity of passage through the deck or bulkhead and comply in that portion of the duct with the following: (i) for ducts with a free cross-sectional area exceeding 0.02 square metres the sleeves shall have a thickness of at least 3 millimetres and a length of at least 900 millimetres. When passing through bulkheads this length shall preferably be divided evenly on each side of the bulkhead. Ducts with a free cross-sectional area exceeding 0.02 square metres shall be provided with fire insulation. The insulation shall have at least the same fire integrity as the bulkhead or deck through which the duct passes. Equivalent penetration protection may be provided to the satisfaction of the Administration; and
(ii) ducts with a free cross-sectional area exceeding 0.075 square metres shall be fitted with fire dampers in addition to the requirements of sub-paragraph (b)(i). The fire damper shall operate automatically but shall also be capable of being closed manually from both sides of the bulkhead or deck. The damper shall be provided with an indicator which shows whether the damper is open or closed. Fire dampers are not required, however, where ducts pass through spaces surrounded by “A” Class divisions, without serving those spaces, provided those ducts have the same fire integrity as the bulkheads which they penetrate.
(i) for ducts with a free cross-sectional area exceeding 0.02 square metres the sleeves shall have a thickness of at least 3 millimetres and a length of at least 900 millimetres. When passing through bulkheads this length shall preferably be divided evenly on each side of the bulkhead. Ducts with a free cross-sectional area exceeding 0.02 square metres shall be provided with fire insulation. The insulation shall have at least the same fire integrity as the bulkhead or deck through which the duct passes. Equivalent penetration protection may be provided to the satisfaction of the Administration; and
(ii) ducts with a free cross-sectional area exceeding 0.075 square metres shall be fitted with fire dampers in addition to the requirements of sub-paragraph (b)(i). The fire damper shall operate automatically but shall also be capable of being closed manually from both sides of the bulkhead or deck. The damper shall be provided with an indicator which shows whether the damper is open or closed. Fire dampers are not required, however, where ducts pass through spaces surrounded by “A” Class divisions, without serving those spaces, provided those ducts have the same fire integrity as the bulkheads which they penetrate.
(c) Ventilation ducts for machinery spaces of Category A or galleys shall not in general pass through accommodation spaces, service spaces or control stations. Where the Administration permits this arrangement, the ducts shall be constructed of steel or equivalent material and so arranged as to preserve the integrity of the divisions.
(d) Ventilation ducts of accommodation spaces, service spaces or control stations shall not in general pass through machinery spaces of Category A or through galleys. Where the Administration permits this arrangement the ducts shall be constructed of steel or equivalent material and so arranged as to preserve the integrity of the divisions.
(e) Where ventilation ducts with a free cross-sectional area exceeding 0.02 square metres pass through “B” Class bulkheads the openings shall be lined with steel sheet sleeves of at least 900 millimetres in length, unless the ducts are of steel for this length in way of the bulkheads. When passing through a “B” Class bulkhead this length shall preferably be divided evenly on each side of the bulkhead.
(f) Such measures as are practicable shall be taken in respect of control stations outside machinery spaces in order to ensure that ventilation, visibility and freedom from smoke are maintained, so that in the event of fire the machinery and equipment contained therein may be supervised and continue to function effectively. Alternative and separate means of air supply shall be provided; air inlets of the two sources of supply shall be so disposed that the risk of both inlets drawing in smoke simultaneously is minimized. At the discretion of the Administration, such requirements need not apply to control stations situated on, and opening on to, an open deck, or where local closing arrangements are equally effective.
(g) Where they pass through accommodation spaces or spaces containing combustible materials, the exhaust ducts from galley ranges shall be constructed of “A” Class divisions. Each exhaust duct shall be fitted with: (i) a grease trap readily removable for cleaning;
(ii) a fire damper located in the lower end of the duct;
(iii) arrangements, operable from within the galley, for shutting off the exhaust fan; and
(iv) fixed means for extinguishing a fire within the duct, except where the Administration considers such fittings impractical in a vessel of less than 75 metres in length.
(i) a grease trap readily removable for cleaning;
(ii) a fire damper located in the lower end of the duct;
(iii) arrangements, operable from within the galley, for shutting off the exhaust fan; and
(iv) fixed means for extinguishing a fire within the duct, except where the Administration considers such fittings impractical in a vessel of less than 75 metres in length.
(a) Ventilation ducts shall be of non-combustible material. Short ducts, however, not generally exceeding 2 metres in length and with a cross section not exceeding 0.02 square metres need not be non-combustible, subject to the following conditions: (i) these ducts shall be of a material which, to the satisfaction of the Administration, has a low fire risk;
(ii) they may only be used at the end of the ventilation device; and
(iii) they shall not be situated less than 600 millimetres, measured along the duct, from an opening in an “A” or “B” Class division including continuous “B” Class ceilings.
(i) these ducts shall be of a material which, to the satisfaction of the Administration, has a low fire risk;
(ii) they may only be used at the end of the ventilation device; and
(iii) they shall not be situated less than 600 millimetres, measured along the duct, from an opening in an “A” or “B” Class division including continuous “B” Class ceilings.
(b) Where the ventilation ducts with a free cross-sectional area exceeding 0,02 square metres pass through “A” Class bulkheads or decks, the opening shall be lined with a steel sheet sleeve unless the ducts passing through the bulkheads or decks are of steel in the vicinity of passage through the deck or bulkhead and comply in that portion of the duct with the following: (i) for ducts with a free cross-sectional area exceeding 0.02 square metres the sleeves shall have a thickness of at least 3 millimetres and a length of at least 900 millimetres. When passing through bulkheads this length shall preferably be divided evenly on each side of the bulkhead. Ducts with a free cross-sectional area exceeding 0.02 square metres shall be provided with fire insulation. The insulation shall have at least the same fire integrity as the bulkhead or deck through which the duct passes. Equivalent penetration protection may be provided to the satisfaction of the Administration; and
(ii) ducts with a free cross-sectional area exceeding 0.075 square metres shall be fitted with fire dampers in addition to the requirements of sub-paragraph (b)(i). The fire damper shall operate automatically but shall also be capable of being closed manually from both sides of the bulkhead or deck. The damper shall be provided with an indicator which shows whether the damper is open or closed. Fire dampers are not required, however, where ducts pass through spaces surrounded by “A” Class divisions, without serving those spaces, provided those ducts have the same fire integrity as the bulkheads which they penetrate.
(i) for ducts with a free cross-sectional area exceeding 0.02 square metres the sleeves shall have a thickness of at least 3 millimetres and a length of at least 900 millimetres. When passing through bulkheads this length shall preferably be divided evenly on each side of the bulkhead. Ducts with a free cross-sectional area exceeding 0.02 square metres shall be provided with fire insulation. The insulation shall have at least the same fire integrity as the bulkhead or deck through which the duct passes. Equivalent penetration protection may be provided to the satisfaction of the Administration; and
(ii) ducts with a free cross-sectional area exceeding 0.075 square metres shall be fitted with fire dampers in addition to the requirements of sub-paragraph (b)(i). The fire damper shall operate automatically but shall also be capable of being closed manually from both sides of the bulkhead or deck. The damper shall be provided with an indicator which shows whether the damper is open or closed. Fire dampers are not required, however, where ducts pass through spaces surrounded by “A” Class divisions, without serving those spaces, provided those ducts have the same fire integrity as the bulkheads which they penetrate.
(c) Ventilation ducts for machinery spaces of Category A or galleys shall not in general pass through accommodation spaces, service spaces or control stations. Where the Administration permits this arrangement, the ducts shall be constructed of steel or equivalent material and so arranged as to preserve the integrity of the divisions.
(d) Ventilation ducts of accommodation spaces, service spaces or control stations shall not in general pass through machinery spaces of Category A or through galleys. Where the Administration permits this arrangement the ducts shall be constructed of steel or equivalent material and so arranged as to preserve the integrity of the divisions.
(e) Where ventilation ducts with a free cross-sectional area exceeding 0.02 square metres pass through “B” Class bulkheads the openings shall be lined with steel sheet sleeves of at least 900 millimetres in length, unless the ducts are of steel for this length in way of the bulkheads. When passing through a “B” Class bulkhead this length shall preferably be divided evenly on each side of the bulkhead.
(f) Such measures as are practicable shall be taken in respect of control stations outside machinery spaces in order to ensure that ventilation, visibility and freedom from smoke are maintained, so that in the event of fire the machinery and equipment contained therein may be supervised and continue to function effectively. Alternative and separate means of air supply shall be provided; air inlets of the two sources of supply shall be so disposed that the risk of both inlets drawing in smoke simultaneously is minimized. At the discretion of the Administration, such requirements need not apply to control stations situated on, and opening on to, an open deck, or where local closing arrangements are equally effective.
(g) Where they pass through accommodation spaces or spaces containing combustible materials, the exhaust ducts from galley ranges shall be constructed of “A” Class divisions. Each exhaust duct shall be fitted with: (i) a grease trap readily removable for cleaning;
(ii) a fire damper located in the lower end of the duct;
(iii) arrangements, operable from within the galley, for shutting off the exhaust fan; and
(iv) fixed means for extinguishing a fire within the duct, except where the Administration considers such fittings impractical in a vessel of less than 75 metres in length.
(i) a grease trap readily removable for cleaning;
(ii) a fire damper located in the lower end of the duct;
(iii) arrangements, operable from within the galley, for shutting off the exhaust fan; and
(iv) fixed means for extinguishing a fire within the duct, except where the Administration considers such fittings impractical in a vessel of less than 75 metres in length.
(3) The main inlets and outlets of all ventilation systems shall be capable of being closed from outside the spaces being ventilated. Power ventilation of accommodation spaces, service spaces, control stations and machinery spaces shall be capable of being stopped from an easily accessible position outside the space being served. This position should not be readily cut off in the event of a fire in the spaces served. The means provided for stopping the power ventilation of the machinery spaces shall be entirely separate from the means provided for stopping ventilation of other spaces.
(4) Means shall be provided for closing, from a safe position, the annular spaces around funnels.
(5) Ventilation systems serving machinery spaces shall be independent of systems serving other spaces.
(6) Store-rooms containing appreciable quantities of highly flammable products shall be provided with ventilation arrangements which are separate from other ventilation systems. Ventilation shall be arranged at high and low levels and the inlets and outlets of ventilators shall be positioned in safe areas and fitted with spark arresters.