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Data on the cost of operation (OPEX) of process plants compared to the components (CAPEX) of the cost estimate are scarcer, mainly because it is a more complex cost and depends on the specific site, process or company. . However, there are some data that are presented below.

Most of the data is based on old sources (1987) and has been updated using the inflation indices corresponding to the CEPCI source for operational costs.

  • In Section 1, we have a dedicated area to establish a knowledge base and a cost estimating methodology framework for process plant opex.
  • In Section 2, we have information where Om Prakash Kharbanda (1979) have tabulated (or calculated) the raw materials and services needed for many processes. As noted above, the accuracy is probably very poor, but in many cases it provides initial ballpark estimates that are better than nothing, and in other cases it is useful to check figures quoted by vendors or others.
  • Section 3 provides some detailed estimates of feedstock and operating income from Chemical Engineering (1973 and 1974), which were also probably quite accurate when published. The processes may have changed considerably since then, but at least these values ​​should still be useful for first conservative approximations.
  • Section 4 provides more percentage breakdowns from Kharbanda (1979), but now the operating cost of the size of a single plant is also estimated.
  • Section 5 presents the operating cost versus plant capacity curves from Guthrie (1974), with the percentage breakdown into major cost components when available from Kharbanda (1979). Guthrie's original data were probably quite accurate as a first general approximation, but they are old and may have suffered greatly from attempts to extrapolate them to the present. The percentage breakdown tables were no doubt based on a single plant or process and location, and may be far from typical. Both of these data sets should, at best, only be used for order-of-magnitude or "rough" estimates.

(*) Taken and adapted from the Book: "Donald Garrett 1989 Bookmatter Chemical Engineering Economics"


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