Question 223Safety & Environmental - 1st Asst/Chief
70% to passWhen an oil fire has been extinguished, the surface of the oil should be kept covered with foam to prevent _______________.
Aspontaneous combustion below the oil surface
Bair from contacting the oil vapors permitting reignition
Ctoxic fumes from escaping to the surface
Dboiling of the heated oil
AI Explanation
The correct answer is B) air from contacting the oil vapors permitting reignition. After an oil fire has been extinguished, the surface of the oil should be kept covered with foam to prevent air from contacting the oil vapors, which could otherwise permit the fire to reignite. The foam acts as a barrier, cutting off the oxygen supply and preventing the vapors from igniting again. The other options are incorrect because: A) spontaneous combustion is not the primary concern after the fire has been put out, C) toxic fumes are not the immediate risk, and D) boiling of the heated oil is not the main hazard in this situation.
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