Fire severity and explosion overpressure depends among other factors on the size of an enclosure and the air/fuel ratio. In well ventilated areas, gas is dispersed and the risk of large gas clouds with stoichiometric conditions is less frequent than in enclosed areas. The same yields for fires, which in enclosures, which with limited air supply will lead to close to stoichiometric or under-ventilated conditions for smaller leakages Offshore platforms and vessels operating in arctic regions are to a larger extent built in by weather cladding, to provide better working climate, and natural ventilation is limited. A higher frequency of critical fires is expected to occur, and the risk of high fire loads with possible risk of escalation will increase. On the other hand, enclosing areas will have a possibility to utilize water from fire-fighting in a more optimal way, both for explosion over-pressure reduction and for fire load reduction.
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