Which of the following describes the fresh air intake of the inert gas system?

The fresh air intake of the inert gas system is designed to introduce outside air into the system, which is essential for maintaining system performance and safety. By allowing the inert gas piping to be used for gas freeing the tanks, it ensures that the environment within the tanks can be effectively managed. Specifically, when gas freeing is necessary, the introduction of fresh air aids in diluting any remaining flammable vapors, thereby making the process safer.

The other options highlight different functions or conditions associated with inert gas systems and flue gas management. For instance, while managing the vacuum on the deck water seal is important, especially during operation, it does not directly relate to the function of fresh air intake. Maintaining a minimum oxygen content in flue gas is another crucial aspect but does not pertain to mixing air or facilitating tank gas freeing. Lastly, while cooling hot flue gases is a relevant consideration in system design, it does not capture the primary role of fresh air intake. Therefore, identifying how fresh air intake facilitates the gas freeing process clarifies its critical function in maintaining safety and operational efficiency in tanker operations.