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
To be useful, crude oil must be refined into consumable products like gasoline, diesel, asphalt, LPG, jet fuel and a wide range of other products. Refining capacity is the given capacity of total charge input which a refinery or set of refineries are built to handle before they convert it into other consumable products. Crude oil may be just a fraction, let's say 90% of the total charge input that a refinery receives.