A refinery is a system
Separation, conversion and treatment change crude into usable products. Feed quality, equipment, operating limits and the market for each product shape the result. One universal yield cannot represent every refinery.
A transparent teaching model
Our Refinery Margin Lab uses three fictional output shares that add to 100%. Their weighted product value is reduced by crude purchase and variable processing cost. It shows how a margin responds when one input changes.
Where the simplification matters
Real refineries can produce more product volume than the crude volume they take in because the outputs have different densities. The lab omits that processing gain, other feedstocks, fixed costs and operating constraints. Its result is a simple teaching contribution.
Keep sensitivity separate from a plan
Change one product price, yield or cost while holding the others constant. Compare the result with the original case. A refinery operating decision needs an actual assay, operating data, product specifications and a validated model.
Primary sources
Reviewed 7 November 2026. Educational interpretation of the sources.
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