2.3 Flash point of oil fuel
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC/Circular.601 Fire Protection in Machinery Spaces (Adopted on 29 January 1993) - Annex 1 - F35 Rev.2 1991 - Fire protection of machinery spaces - 2 Items to be considered for reducing the fire risk - 2.3 Flash point of oil fuel

2.3 Flash point of oil fuel

  .1 Oil fuels with a flash point of less than 60C (closed cup) are not permitted, except for the following:

  • ships certified for restricted service within areas having a climate ensuring that ambient temperatures of spaces where such fuel oil is stored will not rise to within 10C below its flash point, may use oil fuel with flash point below 60C but not less than 43C;
  • installations complying with UR M24 regarding use of crude oil as fuel;
  • in emergency generators oil fuel with a flash point of not less than 43C may be used.

  .2 Oil fuel in storage tanks shall not be heated to temperatures within 10C below the flash point of the fuel oil, except for the following:

Oil fuel in service tanks, settling tanks and any other tanks in the supply system may be heated above this limit, provided:

  • the length of the vent pipes from such tanks and/or a cooling device is sufficient for cooling the vapours to at least 10C below the flash point of the fuel oil;
  • a temperature sensor is fitted in the vent pipe and adjusted to give alarm if the temperature should exceed a limit set at 10C below the flash point of the fuel;
  • the vent pipes are fitted with flame screens meeting the requirements of IMO's Standards for Devices for Preventing Passage of flames into Cargo Tanks";
  • there are no openings from the vapour space of the fuel tanks into machinery spaces (bolted manholes are acceptable) ;
  • enclosed spaces shall not be located directly over such fuel tanks, except for well ventilated cofferdams;
  • electrical equipment shall not be fitted in the vapour space of the tanks, unless it is certified to be intrinsically safe.

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