No, it isn't.
LNG won't even ignite, it has to be warmed to a vapor first. The methane vapor has to be diluted down to 15% concentration with air before it will ignite.
By the time a significant quantity has warmed and diluted, it is far up in the air when the leak occurs outside.
Methane (natural gas) is only explosive when mixed with air in a confined space, trapping it from rising away.
~LNG won’t even ignite, it has to be warmed to a vapor first. The methane vapor has to be diluted down to 15% concentration with air before it will ignite.~
Indeed, they are an explosion hazards in case of any minor fuel leak. I wouldn’t ever used one on high seas because of storms, waves etc.
Another thing is a price issue. LNG is not cheap at all and for that reason is not ever competitive with pipeline delivered gas in Europe.
It can’t beat oil as a boat fuel in that department as well.
Sounds like another green blunder.