In case of a LNG leak from a liquid header flanged connection, what is the first precautionary action to take?

Correct Answer: Option C — Flood the area under the leak with water.

LNG is a cryogenic liquid; if a leak occurs, water is used to warm the surrounding area and disperse the vapor cloud. Because LNG is extremely cold, water prevents the embrittlement of structural steel, which could lead to catastrophic failure if the liquid contacts the hull or deck plating directly.