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.