· LNG a liquid at atmospheric pressure, not a gas like CNG. It’s not stored at high pressure, so it flows fairly slowly, not screaming out in a jet. Pound to found LNG is probably less dangerous than gasoline.
· Because the LNG is a cryogenic liquid, those huge tanks are double walled and very tough, with several feet of insulation between to the two walls. The insulation is also a load bearing structure, so it adds to the toughness of the design.
· Yes, LNG will vaporize as it absorbs heat from it’s surrounding, but that slows and stops as the area around it is cooled. Revaporizing a tanker load of LNG is simple in concept, but a major engineering project in reality. Igniting the vapor will help heat and vaporize the rest, but once vaporized it’s low density causes it to spreads vertically, not horizontally like a liquid. Don’t expect to get a ground hugging fireball.
· There have been several large accidents involving LNG, but all have been at the liquefaction plants, not on the tankers.
Having said all that, I would want to live next to either an oil of LNG terminal.
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