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Flare Stack
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Author:
Shishupal Choudhary
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by
S Choudhary
SIZING A SUBSONIC FLARE STACK Project Client Unit No.
EIL Job No. Location Tag No.
Item Name
Qty
Prepared by Reviewed by Ref Co Code Date
API 52 521 Fi Fifth Ed Edition Ja Jan 20 2007 & Addendum, Ma May 20 2008
BASIC DATA
Mass Flow Rate
qm
kg/h
45360
Absolute Pr within flare tip,
P2
kPa
101.3 Fig. 7 Flame Length Length Vs Heat Release Release
Average Molecular Mass Flowing Temperature Compressibility Factor Mach No. at flared tip Heat of combustion
M T Z Ma
K kgJ/kg
Wind Velocity
u∞
m/s
Fraction of Heat radiated Fraction of radiated heat trans thru atm.
F τ
Maximum allowable radiation
K
kW/m
Grade Distance from CL of flare stack to point being considered
r
m/s
Ration of specific heatts in the gas
k
46.1 422 1 0.2 50000 8.9 0.3 1
2
6.3 45.7 1.4
CALCULATION OF FLARE TIP DIAMETER
Flare tip inside diameter
d
m
Q L
kW m
0.4677577
Fig. 9 Approx. Flame Distortion due to lateral wind
CALCULATION OF FLAME LENGTH
Heat Liberated Flame Length ( from Fig 7 of API 521)
630000 50
CALCULATION OF FLAME DISTORTION CAUSED BY WIND VELOCITY
Vapour Volumetric Flow rate Exit velocity at flare tip From fig 9 of API 521 From fig 9 of API 521
qvap
m3/s
u j
m/s
9.463841148 55.1005451
u∞/u j
0.161522903
∑∆y/L ∑∆x/L ∑∆y ∑∆x
0.36 0.85 18 42.5
CALCULATION OF FLARE STACK HEIGHT
Min. distance from the epicentre of the flame to the object being considered
Overall Height of Stack
D r' h' h
m m m m
48.87264093 24.45 42.31704777 33.31704777 Fig C.1 Dimensional references for Flare stack
CALCULATION OF NOISE LIMIT
Speed of sound in the gas abs. Static Pr upstream of the Restriction abs. Static Pr upstream of the Restriction Pressure Ratio Noise Level from Fig 18
c
L
m/s psia psia Pr dB dB
76.28936831
L30 r Lp
dB m dB
130.2893683 120 102.5634811
Cuft/lb TPD
12.03259803 1088.64
2
10*ln(0.5*qm*c /3600) Noise Level at 30 m Distance from the sound source (tip) Sound Pressure at distance r
326.486042 48 16 3 54
CALCULATION OF GROUND LEVEL C ONCENTRATION
Specific Voume of Toxic Gas Wt Discharge of Pollutant Component Vertical Diffusion Coefficient
V M Dz
Horizontal Diffusion Coefficient
Dy
Air Velocity at Grade Stack Height Environmental Factor
mu H
mph ft
5 109.3078995 0.25
Cocentration at Grade
Cmax
ppm
810.6250958
Dist from stack to the point of max concent.
X
m
2.865708405
0.13 0.13
CALCULATION OF AIR REQUIREMENT FOR SMOKELESS FLARING
Air Flow rate Air Flow rate
kgmole/hr kg/hr
Efficiency of Blower
Power Rating of Blower
kW
CALCULATION OF STEAM REQUIREMENT FOR SMOKELESS FLARING
1712.34 178768296 0.5 57.8085984
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