These are typically grouped into fixed and variable categories depending on whether they vary with throughput or not.
- Fixed costs are any costs that do not vary with the level of throughput at any point in time. Examples are labor and equipment. Fixed costs are typically measured relative to crude processing capacity (e.g., USD/bbl crude distillation capacity). Fixed costs are also frequently subdivided into costs associated with maintaining the refinery (maintenance costs), costs of running the refinery (operating costs), and costs of managing the refinery (supervisory, overhead, support)
- Variable costs are any costs that vary with the level of refinery throughput. Examples include energy, catalyst, and chemicals. Variable costs are typically measured relative to crude throughput (e.g., USD/bbl crude run or USD/bbl of utilized crude capacity). Generally, all costs are assumed to vary with refinery size and with refinery complexity
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