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To answer this correctly, you need to know what the most dangerous concentration of oxygen with natural gas is. Natural gas can only be ignited in a concentration of 10 to 12% oxygen. Too much it won't ignite (the gaseous form of gas would be too diluted to ignite and sustain a flame), and too little it won't ignite, it needs oxygen.

Now if the gas is liquefied, it will not mix well with oxygen, which is still gaseous (it boils at -183F), such that any natural gas boiling off the liquid will, in all likelihood, mix with any gaseous oxygen in that concentration until it becomes an explosive mixture. All natural gas tanks (bulk storage only) are vented to allow a small amount of gas to evaporate off, producing a cooling effect on the tank, and lowering the pressure required to maintain the gas in the liquid form. This venting and cooling also serves to remove any dissolved oxygen from the LNG and vents it to the atmosphere.

Bottom line, no oxygen mixed with LNG is safe. Levels must be kept to a minimum to prevent explosions.

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Q: How much the oxygen content of liquefied natural gas is safe?
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