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FC Flare cost ($)
H Flare height (ft)
h Emission stream heating value (Btu/scf)
e
h Supplementary fuel heating value (Btu/scf)
f
h Flare gas heat content (Btu/scf)
flg
HRS System operating hours per year (h/yr)
IC Total indirect costs ($)
Index CE Equipment Cost Index in the month-year a
a
Index CE Equipment Cost Index in the month-year b
b
MW Molecular weight of emission stream (lb/lb-mol)
e
MW Molecular weight of flare gas (lb/lb-mol)
flg
∆P System pressure drop (in. H O)
2
PEC Purchased equipment cost ($)
Q Emission stream flow rate (scfm at 77°F and 1 atm)
e
Q Supplementary fuel flow rate (scfm)
f
Q Flare gas flow rate (scfm)
flg
Q Steam requirement (lb/min)
s
SP Site preparation cost ($)
T Emission stream temperature (°F)
e
T Temperature of flare gas (°F)
flg
TAC Total annual cost ($)
TCC Total capital cost ($)
θ Flare angle (deg)
U Actual exit velocity of flare gas (ft/s)
flg
U Maximum flare gas exit velocity (ft/s)
max
V Wind velocity (mph)
w
REFERENCES
1. US Congress, Fed. Reg. 50, 14,941–14,945 (1985).
2. US EPA, Evaluation of the efficiency of Industrial Flares: Test Results. EPA600/2-84-095
(NTIS PB84199371). US Environmental Protection Agency, Washington, DC, 1984.
3. US EPA, Parametric Evaluation of VOC/HAP Destruction Via Catalytic Incineration. EPA-
600/2-85-041 (NTIS PB85-1987). US Environmental Protection Agency, Washington, DC,
1985.
4. US EPA, Organic Chemical Manufacturing. Vol. 4: Combustion Control Devices. EPA-
450/3-80-026 (NTIS PB81-220535). US Environmental Protection Agency, Washington,
DC, 1980.
5. US EPA, Reactor Processes in Synthetic Organic Chemical Manufacturing Industry—
Background Information for Proposed Standards. US Environmental Protection Agency,
Research Triangle Park, NC, 1984.
6. US EPA, Polymer Manufacturing Industry—Background Information for Proposed Standards.
EPA450/3-83-019a (NTIS PB88-114996). US Environmental Protection Agency, Washington,
DC, 1985.
7. US EPA, OAQPS (Office of Air Quality Planning and Standards), Control Cost Manual.
Fourth Edition, EPA-450/3-90-006 (NTIS PB90-69954). US Environmental Protection
Agency, Washington, DC, 1990.
8. G. S. Mason and R. Kamar. Chem. Eng., 95(9) (1988).