Cost function for desander:

The original cost function (A1) for the desander is as follows:

The original cost function (A1) for desander has as its variable (A) the surface area in ft2 (square feet). The following relationship was used to express that area as a function of flow:

With an Overload Flow (C) of 300 m/d, the initial equation is transformed as follows:

Additional modifications to this function correspond to the correction of costs per year, with the CCI ENR index of 9547 of the year 2013, to obtain A3. Then the part B2 related to the elasticity index is added. This is done in the same way as explained in the Cost Functions Wiki — General .

The final equation is the following:

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