Question 1399 Deck General

The correct answer is B) inerted. For a vessel's crude oil wash system to be safely operated, the cargo tanks being washed must be inerted, meaning that the tanks are filled with an inert gas like nitrogen to displace flammable vapors. This is a crucial safety requirement to prevent the risk of explosion or fire during the crude oil washing process. The other answer choices are incorrect because: A) gas free tanks are not sufficiently protected from flammable vapors, C) tanks full of cargo cannot be safely washed, and D) opening tanks to the atmosphere would reintroduce flammable vapors.