[wideminded]

Since LNG first has to be vaporized, then the methane diluted to 15% concentration before it can be ignited, there is no way to explode and LNG tanker.

But if there was an accident and the tanker developed a crack it might incinerate an entire town.

[thackney]

But if there was an accident and the tanker developed a crack it might incinerate an entire town.

No way. Methane is significantly lighter than air. If you had a leak, the LNG first has to warm up to boil off as vapor. By the time it mixed to 85% air / 15% methane, it is up in the air.