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304 stainless steel is the most common material used in fabricating adsorber vessels. [9, 10] 1.7.1.3 Total Purchased Cost As stated earlier, the costs of such items as the fans, pumps, condenser, decanter, instrumentation, and internal piping can be factored from the sum of the costs for the carbon and vessels. Based on four data points derived from costs supplied by an equipment vendor [10], we found that, depending on the total gas flow rate (Q), the ratio (Rc) of the total adsorber equipment cost to the cost of the vessels and carbon ranged from 1.14 to 2.24. These data points spanned a gas flow rate range of approximately 4,000 to 500,000 acfm. The following regression formula fit these four points: where Q is in the range of 4,000 to 500,000 acfm Correlation coefficient (r) = 0.872 R 5.82Q0.133 c (1.26) The total adsorber equipment cost (CA) is the product of Rc and the sum of the carbon and vessel costs, as follows: CA RcCc CvNA ND (1.27) 1.7.1.4 Total Capital Investment As discussed in Section 1, in the methodology used in this Manual, the total capital investment (TCI) is estimated from the total purchased cost via an overall direct/indirect installation cost factor. A breakdown of that factor for carbon adsorbers is shown in Table 1.4. As Section 1.2 indicates, the TCI also includes costs for land, working capital, and off-site facilities, which are not included in the direct/indirect installation factor. However, as these items are rarely required with adsorber systems, they will not be considered here. Further, no factors have been provided for site preparation (SP) and buildings (Bldg.), as these site-specific costs depend very little on the purchased equipment cost. The installation factor is applied to the total purchased equipment cost, which includes the costs of auxiliary equipment (i.e., the stack, external ductwork, etc) and the freight costs and sales taxes (if applicable). The external ductwork consists of the ducting needed to convey the exhaust gas from the emission source to the adsorber system, and then from the adsorber to the stack. (Costs for ductwork and stacks are shown elsewhere in this Manual.) Normally, the adjustment would also cover the instrumentation cost, but this cost is usually included with the adsorber equipment cost. Finally, note that these factors reflect “average” installation conditions and could vary considerably, depending upon the installation circumstances. 1-24PDF Image | Carbon Adsorbers
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