In my long career in which plants, over 70 at one point, used #6 fuel oil for the boilers, I never encountered or even heard of an explosion. As a matter of fact, #6 fuel was totally trouble free. When it got so expensive, installations were made so we could switch to natural gas. We freely switched out and back, depending on which had a lower cost at the time.
I don't know about now, but in the '60's,'70,s and '80's there were hundreds and hundreds of plant boilers that used 36 fuel oil all over the US, and I suppose the world.
We did not like to switch to natural gas.
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