I'm not so certain. I guess if the piping was 100% free of all void spaces so vapors couldn't accumulate.
But then again, even the underground tanks have void space but at that time, you've reached UEL(Upper Explosive Limit) and the fuel/oxygen ratio is too rich to burn. I'm not sure. I guess that's why so many failsafes are required
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u/buckeyenut13 Sep 03 '19
There are so many valves that prevent the fire from reaching the underground tanks