4 Ventilation of spaces relating to diesel
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - International Codes - SCV Code - Code of Safety for Small Commercial Vessels Operating in the Caribbean - Chapter IV - Machinery - Part A - General Provisions - 4 Ventilation of spaces relating to diesel

4 Ventilation of spaces relating to diesel

  4.1 A space containing diesel machinery shall be fitted with at least two ducts to furnish natural or powered supply and exhaust ventilation. The total inlet area and the total outlet area of each ventilation duct shall not be less than 650 mm2 (one square inch) for each 300 cm (foot) of beam of the vessel. These minimum areas shall be increased as necessary when the ducts are considered as part of the air supply to the engines.

  4.2 A duct shall be of rigid permanent construction, which does not allow any appreciable vapor flow except through normal openings, and made of noncombustible material. The duct shall lead as directly as possible from its intake opening to its terminus and be securely fastened and supported.

  4.3 A supply duct shall be provided with a cowl or scoop having a free area not less than twice the required duct area, which shall be kept open at all times except when the weather is such as to endanger the vessel if the openings are not temporarily closed.

  4.4 Dampers shall not be fitted in a supply duct.

  4.5 A duct opening shall not be located where the natural flow of air is unduly obstructed, adjacent to possible sources of vapor ignition, or where exhaust air may be taken into a supply duct.

  4.6 Provision shall be made for closing all supply duct cowls or scoops and exhaust duct discharge openings for a space protected by a fixed gas extinguishing system. All closure devices shall be readily available and mounted in the vicinity of the vent.

  4.7 A space containing a diesel fuel tank and no machinery shall meet the following requirements: -

  • .1 A space of 14 m3 (500 ft3) or more in volume shall have a gooseneck vent of not less than 65 mm (2.5 inches) in diameter.

  • .2 A space of less than 14 m3 (500 ft3) in volume shall have a gooseneck vent of not less than 40 mm (1.5 inches) in diameter.

  • .3 Vent openings shall not be located adjacent to possible sources of vapor ignition.

Parent topic: Part A - General Provisions
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