Question 1078 Deck General

The correct answer is B) The tank must be vented to the atmosphere. When an individual cargo tank is closed off from the inert gas system by the tank isolation valve, the tank must be vented to the atmosphere. This is because the tank is no longer receiving the inert gas that maintains a safe, non-flammable atmosphere within the tank. Venting the tank to the atmosphere allows any residual flammable vapors to be safely released, preventing the buildup of a potentially explosive atmosphere in the isolated tank. The other options are incorrect because: A) Gas freeing the tank is not necessary in this scenario, as the tank is already isolated from the inert gas system. C) Ballasting the tank does not address the need to vent the tank's atmosphere. D) Closing the bypass valve is not the primary action required, as the tank must be vented to the atmosphere.