Question 1187 Deck General

The correct answer is C) reducing the oxygen concentration below levels necessary for combustion. Inert gas systems on ships are designed to reduce the possibility of cargo tank explosions by displacing the oxygen in the tank's atmosphere with an inert gas, typically nitrogen or carbon dioxide. This lowers the oxygen concentration in the tank to a level below that required for combustion, effectively preventing explosions and fires. The other options are incorrect because: A) eliminating sparks and fire is not the primary function of an inert gas system, B) inert gas systems do not use foam, and D) removing all hydrocarbon gases is not necessary as long as the oxygen level is reduced below the combustible range.