AIGF Exit Exam • Set 3 Question 27 of 30

What gas is used to inert LNG fuel tanks and supply lines prior to gas-freeing?

✓

Direct Answer

Option B: Dry Nitrogen gas

Dry Nitrogen gas is the industry standard for inerting LNG fuel tanks and supply lines. Nitrogen is chemically inert, non-flammable, and has a low dew point, making it ideal for displacing oxygen and moisture, thereby preventing the formation of explosive mixtures or ice crystals within the cryogenic fuel system.

All Options

A

Carbon Dioxide

B

Dry Nitrogen gas (Correct Answer)

C

Argon

D

Compressed Air

Detailed Explanation & Context

Dry Nitrogen gas is the industry standard for inerting LNG fuel tanks and supply lines. Nitrogen is chemically inert, non-flammable, and has a low dew point, making it ideal for displacing oxygen and moisture, thereby preventing the formation of explosive mixtures or ice crystals within the cryogenic fuel system.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Ships subject to the IGF Code (AIGF).

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