Question 1115 Deck General

70% to pass

How does an inert gas system on a tanker function to prevent explosions in cargo tanks?

A Maintains a positive pressure on the vent header to cool the flammable vapors.

B De-energizes the "charged mist" effect.

C Inert gas filters out the flammable vapors from the cargo tank spaces.

D Inert gas dilutes the flammable vapor and air concentrations to keep them below the lower explosive limit.

AI Explanation

The correct answer is D) Inert gas dilutes the flammable vapor and air concentrations to keep them below the lower explosive limit. The inert gas system on a tanker functions to prevent explosions in cargo tanks by reducing the oxygen content and diluting the flammable vapors, thereby keeping the vapor-air mixture below the lower explosive limit. This is the primary purpose of the inert gas system, as required by maritime safety regulations. The other answer choices do not accurately describe the core mechanism by which the inert gas system prevents explosions.

Pass Your Coast Guard Licensing Exams!

Study offline, track your progress, and simulate real exams with the Coast Guard Exams app

Download on App Store Get it on Google Play Download for Mac