All About Petroleum.

(Please click the above picture for study the lesson)

For your information,

Though barrels are no longer used to ship oil, in America they are still the usual measure of oil commerce. The volume of the barrel is 42 gallons, a size determined by the practices of the first Pennsylvania oil companies. They shipped oil to market by wagon or train in used wine barrels that held 48 gallons. To allow for spillage during shipment, the recipients of the barrels paid for only 42 gallons. Shippers soon learned to put only that amount in each barrel.

Oil in Europe is measured in tonnes rather than barrels. Historically, oil for Europe and other parts of the world has been transported by sea where weight–not volume–is the usual measure.

Information on Petroleum - By wikipedia.com http://en.wikipedia.org/wiki/Crude_petroleum

Information on Oil refinery - By U.S. Department of Labor http://www.osha.gov/dts/osta/otm/otm_iv/otm_iv_2.html

Gasoline Refining and Testing - By Chevron http://www.chevron.com/products/prodserv/fuels/bulletin/motorgas/3_refining-testing/pg2.asp

Refining Flow Diagram - By Honeywell http://www.uop.com/refining/1010.html

Basic Refinery Processes -By SET Labortories, Inc. http://www.setlaboratories.com/overview.htm#Basics%20of%20Crude%20Oil