Nelson Complexity
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Nelson's Complexity Factor

  • In the Refining Industry, a common index termed as "EDC" - Equivalent Distillation Capacity is defined to calculate the benchmark of manpower requirement.
  • Calculation of EDC is a two-step process.
    • The first step is the multiplication of the capacity of each unit in the refinery with the Nelson's complexity factor
    • The second is the sum of these products to arrive at the EDC for the refinery in total.

Nelson Complexity Index

  • Nelson Complexity Index is a measure of secondary conversion capacity in comparison to the primary distillation capacity of any refinery.
  • It is an indicator of not only the investment intensity or cost index of the refinery but also the value addition potential of a refinery.
  • The index was developed by Wilbur L Nelson in 1960 to originally quantify the relative costs of the components that constitute the refinery.
  • Nelson assigned a factor of one to the primary distillation unit.
  • All other units are rated in terms of their costs relative to the primary distillation unit also known as the atmospheric distillation unit.

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