Calendar day

Calendar day capacity is a measure of refinery capacity, adjusting for typical operating conditions that keep average throughput below the maximum achievable throughput for a single day (stream day capacity).

Calendar day capacity is the typical capacity measure used in evaluating the economics of a process unit.

The relationship between calendar days and stream days is unique to every unit, but a typical rule of thumb is 350 calendar days of operation out of 365 total (stream) days. 

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