🔍 Key Concepts

• Inert gas systems on tankers and their purpose in cargo tanks • Difference between flue gas from boilers and pure gases like nitrogen or oxygen • What "reduced oxygen" means in terms of preventing combustion

💭 Think About

• Think about what conditions are needed inside a cargo oil tank to prevent fire or explosion. Does that require 0% oxygen, or just below a certain safe limit? • Consider what the source of gas is in a flue gas type system. Would boiler uptake gas be pure oxygen, pure nitrogen, or a mixture with lower oxygen? • Which option best matches something that can realistically and economically be produced from boiler flue gas on a ship?

✅ Before You Answer

• Verify that flue gas from a boiler still contains some oxygen and combustion products like CO₂ and N₂. • Check which option describes a practical, shipboard system used for tank inerting, not a laboratory-pure gas source. • Confirm that the primary purpose is to create an inert atmosphere (i.e., oxygen content safely below the level that supports combustion), not to reach 0% oxygen.