It’s the mother’s milk of the refining process.
(and my bread and butter.)
Its the mothers milk of the refining process.
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Also known as “refinery leftovers” and “the bottom of the barrel”.
Lots of BTU’s however in those long-chain hydrocarbons.
Cheers
A few yrs. ago I had a client that had a dual fuel boiler. Natural gas and fuel oil.
We ran it on natural gas normally, but he had a buried tank w/ some fuel oil he wanted to burn.
We changed a few settings and fired it up.
Wow, what a difference in output. I’d forgotten how much hotter oil burns v natural gas.