Related Pages
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 and 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.
