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TOPIC: Location of flare stack with respect to wind direction

5 years 11 months ago #8399

  • Er.piping
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What should be the ideal location of a vertical flare stack in a refinery with respect to the wind direction.
I have got mixed answers for this question some said it should be on the down stream of a plant some said it is preferred to locate it on side corners of a plot, OISD 118 says flare should be located 90 mtr. Away from any process unit on up stream of wind direction wrt. to plot.

What does the Code say about Flare stack location 5 years 2 weeks ago #8863

  • AntonyMariashalini
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I have found a valuable piece of info from this link. :)
What does the Code say about Flare stack location (Upwind or Downwind)?

Re: Location of flare stack with respect to wind direction 5 years 11 months ago #7054

  • Jop
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Flare Stacks and Fired Heaters contain Fire and therefore is a point of ignition for any flammable hydrocarbon vapors.

Flare Stacks
Locate the flare stack upwind of process units, with a minimum distance of 200 feet from process equipment, tanks, and cooling towers. If the stack height is less than 75 feet, increase this distance to a minimum of 300 feet. These minimum distances should be verified by Company Process Engineering.

Furnaces (Fired Equipment)
Locate fired equipment, if practical, so that flammable gases from hydrocarbon and other processing areas cannot be blown into the open flames by prevailing winds.
Horizontal clearance from hydrocarbon equipment (shell to shell) 50'- 0” Exception: Reactors or equipment in alloy systems should be located for economical piping arrangement.
Provide sufficient access and clearance at fired equipment for removal of tubes, soot blowers, air preheater baskets, burners, fans, and other related serviceable equipment.
Clearance from edge of roads to shell 10’- 0"
Pressure relief doors and tube access doors should be free from obstructions. Orient pressure relief doors so as not to blow into adjacent equipment.
The elevation of the bottom of the heater above the high point of the finished surface should allow free passage for operation and maintenance.


Furnace Piping
Locate snuffing steam manifolds and fuel gas shutoff valves a minimum of 50 feet horizontally from the heaters they protect.
Burner Valving for a Floor Fired Furnaces: Combination oil and gas firing valves should be operable from burner observation door platform. For those fired by gas only, the valves should be near the burner and should be operable from grade.
Burner Valving for a Side Fired Furnaces: Locate firing valves so they can be operated while the flame is viewed from the observation door.
Do it once and Do it Right

Re: Location of flare stack with respect to wind direction 5 years 6 months ago #7138

  • AbhijitN
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Open Flames always upwind so that flammable gases from hydrocarbon and other processing areas cannot be blown into the open flames by prevailing winds.

Re: Location of flare stack with respect to wind direction 5 years 6 months ago #7141

  • knives
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Preferred is upwind. But it can alternately be located on the sidewind. At some instance where it cannot be really avoided, the stack may also be located downwind provided that a gas dispersion study and consequence modeling was carried out for all potential release scenarios, and the required separation distance between release source and stack as per study was met.

Re: Location of flare stack with respect to wind direction 5 years 6 months ago #7143

  • AbhijitN
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Agreed Knives, sometimes it is not always possible to meet the IDEAL & yes I have seen the sidewind location of the flare stack.
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