The beginning of the amazing events at Krakatoa in 1883 date to May 20 when there were initial rumblings and venting from the volcano, which had been dormant for about 200 years.
A refinery margin is the revenue associated with refining petroleum, expressed as a value per volume (e.g. $/L), net of the cost of the crude oil input. The simplest refining
The average monthly gross refining margin for the US Gulf Coast coking refinery during this 10-year period was $7.09/bbl with a high of $17.14/bbl and a low of $2.51/bbl. The US Gulf Coast model coking refinery had an average gross refining margin of about $3.45/bbl more than the cracking refinery during 1995-2004.