What is the inert gas system on a tanker used for?

Correct Answer: Option B — dilute tank atmospheres to keep gas concentrations below the lower explosive limit

Inert gas systems function by displacing oxygen with non-combustible gas, typically flue gas or nitrogen. By maintaining the oxygen content below the level required for combustion, the system keeps the tank atmosphere outside the flammable range, effectively preventing the formation of an explosive mixture within the cargo tanks.