Page 360 - Air Pollution Control Engineering

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Flare Process 337

Table 4
Capital Cost Factors for Flares
Cost item Factor
Direct Costs
Purchased Equipment Costs
Flare (FC) and auxiliary equipment, EC As estimated, EC
Instrumentation 0.10 EC
Sales tax 0.03 EC
Freight 0.05 EC
Purchased equipment cost, (PEC) PEC = 1.18 EC

Direct Installation Costs
Foundation and supports 0.12 PEC
Handling and erection 0.40 PEC
Electrical 0.01 PEC
Piping 0.01 PEC
Insulation for ductwork 0.01 PEC
Painting 0.01 PEC
Direct installation cost 0.56 PEC

Site preparation As required, SP
Buildings As required, Bldg.
Total direct costs (DC) 1.56 PEC + SP + Bldg.

Indirect Costs (Installation)
Engineering 0.10 PEC
Construction and field expenses 0.10 PEC
Contractor fee 0.10 PEC
Start-up 0.01 PEC
Performance test 0.01 PEC
Contingencies 0.03 PEC
Total indirect cost (IC) 0.35 PEC
Total capital costs = DC + IC 1.74 PEC + SP + Bldg.
Note: Obtained from Emissions Standards Division, QAQPS (Office of Air Quality Planning and
Standards), US EPA, Research Triangle Park, NC.

For all three cases cost includes the flare stack and support, burner tip, pilots, utility
piping, 100 ft of vent stream piping, utility metering, utility control, water seals, gas
seals, platforms, and ladders. The costs are based on carbon steel construction except
for the upper 4 ft and the burner tip, which is constructed of 316L stainless steel.
Once FC has been obtained, Table 4 is used to obtain the flare capital costs. The flare
equipment cost (EC) is obtained by adding FC to any auxiliary equipment, and the
purchased equipment cost (PEC) is obtained using the factors given in Table 4.
The total capital cost (TCC) of a flare is the sum of the purchased equipment cost and
the direct and indirect installation cost factors. These factors are given in Table 4 as a
percentage of the purchased equipment cost.