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Flare Stack Calculation, Erwin A Page 1 of 11
Flare Stack Calculation SheetSimple Approach
Title : Date of Calculation :HP Flare Calculation ###
Project No : Calculate By :1131/SKPI-SKPP-2006 Erwin Apriandi
1 Description Symbol Unit
2 Flowrate 75.010 MMscfd
3 88,501.944
4 24.5845 Mass Flow W 90123.000 kg/hr
6 Mol Weigth 24.070
7 Pressure at Flare Tip 124.000 kPa8 Flowing Temperature T 283.900 K9 Compressibility factor z 1.000
10 Ratio of Specific Heat k 1.21011 Mach No 0.450121314 Flare Tip ID 0.404 m151617 Heat of combustion 47140.000 kJ/kg18 Heat Liberated Q 1180110.617 kW19 Flame Length L 60.000 m approx20
21 Wind velocity 14.900 m/s
22 Flare Tip velocity 192.276 m/s
23 0.077242526 0.460 approx27 Σ∆y 27.600 m2829 0.770 approx30 Σ∆x 46.200 m313233 Fraction Radiated Heat F 0.30034 ד 1.000
35 Allowable Radiation K 6.31036 Safe Distance to Flame Centre D 66.836 m373839 Stack To Point of Interest R 60.000 m40 Flare Height H 41.927 m41
Calculation are based on API RP 521
m3/hr
m3/s
Mw
P2
U~
Uj
U~/Uj
Σ∆y/L
Σ∆x/L
kW/m2
Fig 8 & 9
Fig 10
Fig 10
Flare Stack Calculation, Erwin A Page 2 of 11
Flare Stack Calculation, Erwin A Page 3 of 11
Flare Stack Calculation SheetBrzustowski's and Sommer's Approach
Title : Date of Calculation :HP Flare Calculation ###
Project No : Calculate By :1131/SKPI-SKPP-2006 Erwin Apriandi
1 Description Symbol Unit
2 Flowrate 75.010 MMscfd
3 88,501.944
4 24.5845 Mass Flow W 90123.000 kg/hr
6 Mol Weigth 24.070
7 Pressure at Flare Tip 124.000 kPa
8 Flowing Temperature 283.900 K
9 Air Temperature 289.000 K10 Compressibility factor z 1.00011 Ratio of Specific Heat k 1.21012 Mach No 0.4501314
15 Flare Tip ID 0.404 m161718 Heat of combustion 47140.000 kJ/kg19 Heat Liberated Q 1180110.617 kW20 Flame Length L 60.000 m approx21
22 Wind velocity 11.800 m/s23 Sonic Velocity 344.534 m/s
24 Flare Tip velocity 155.040 m/s25
26 LEL 2.100 %v/v27 LEL Conc Factor 0.22928 Jet & Wind thrust parameter 26.2482930 From Fig C.2.B & C.3.B
31 Horizontal distance, from stack to flame centre 17.000 m approx
32 Vertical distance, from stack to flame centre 14.000 m approx333435 Fraction Radiated Heat F 0.30036 ד 1.000
37 Allowable Radiation K 6.31038 Safe Distance to Flame Centre D 66.836 m394041 Stack To Point of Interest R 60.000 m42 Flare Height H 37.167 m43
Calculation are based on API RP 521
m3/hr
m3/s
Mj
Pj
Tj
T~
dj
U~
Uj
CL
xc
yc
kW/m2
Fig C.2 Fig C.3
Fig 8 & 9
Flare Stack Calculation, Erwin A Page 4 of 11
