🔍 Key Concepts

• Inert gas systems on gas carriers – why they are used and what they must prevent in cargo tanks and spaces • Difference between “inert gas”, nitrogen, and dry air, especially for LNG cargoes • Why dew point (moisture content) matters when dealing with very cold liquefied gases

💭 Think About

• Think about what gas (or gases) are safest to use around LNG cargo and cargo piping, considering extreme cold and flammability limits • Ask yourself which option matches the typical requirements for drying and inerting spaces that will be exposed to LNG temperatures • Compare the listed dew points: which would be appropriate to avoid moisture freezing and forming ice/hydrates in an LNG system?

✅ Before You Answer

• Verify what type of inerting medium (generic flue-gas type, nitrogen, or air) is normally used on LNG carriers, not crude oil tankers • Check typical dew point specifications for gases used to purge and inert LNG cargo systems (how dry do they need to be?) • Confirm whether a standard LNG inert gas plant is expected to supply only one gas or can provide two different streams (e.g., an inerting gas plus very dry air)