Page 99 - Air Pollution Control Engineering

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Fabric Filtration 79

Table 9
Capital Cost Factors for Fabric Filters
Direct costs Factor
Purchased Equipment Costs (PEC)
Fabric filter As estimated
Bags As estimated
Auxiliary equipment As estimated
(EC = sum of as estimated)
Instruments and controls 0.10 EC
Taxes 0.03 EC
Freight 0.05 EC
PEC = 1.18 EC
Installation Direct Costs (IDC)
Foundation and supports 0.04 PEC
Erection and handling 0.50 PEC
Electrical 0.08 PEC
Piping 0.01 PEC
Insulation for ductwork a 0.07 PEC
Painting b 0.02 PEC
Site preparation (SP) As required
Buildings (Bldg.) As required
IDC = 0.72 PEC + SP + Bldg.
Total direct cost (DC) = PEC + IDC = 1.72 PEC + SP + Bldg.
Indirect Costs
Engineering and supervision 0.10 PEC
Construction and field expense 0.20 PEC
Construction fee 0.10 PEC
Start-up fee 0.01 PEC
Performance test 0.01 PEC
Contingencies 0.03 PEC
Total Indirect Cost, IC = 0.45 PEC
Total capital cost (TCC) = DC + IC = 2.17 PEC + SP + Bldg.

2
a If ductwork dimensions have been established, cost may be established based on $10–$12/ft of sur-
face for field application. Fan housings and stacks may also be insulated.
b The increased use of special coatings may increase this factor to 0.06 PEC or higher.
Source: ref. 8.

rate is provided in Table 10. The cost of maintenance materials is assumed to equal the
maintenance labor costs.

6.3. New Technology Awareness
Asanitary bag filter has been developed to enhance clean-in-place (CIP) capability (28).
The entire system can be cleaned between product changes without changing the filter
bags. The system eliminates crosscontamination of products while still efficiently col-
lecting powdered pollutants from an air emission stream. Another gas filter has been
developed using the ceramic-element technology. The controlled filtration layers trap
larger particles in the outer layer and catch smaller ones in the inner layer, resulting in