Question 1411 Deck General

The correct answer is B) flames on deck from entering the tank vent. Fuel oil tank vents are fitted with a screen to prevent flames on the deck from entering the tank vent and igniting the fuel vapors inside the tank. This is a safety precaution required by regulations to prevent the risk of fire and explosion. The other options are incorrect because: A) the screen does not stop oil from flowing out of the tank vent, C) the screen does not stop vapors from leaving the tank vent, and D) the screen does not prevent air from entering the tank vent, which is necessary for proper tank ventilation.