What is flare flashback and how to prevent it?
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If air or oxygen enters into the flare system and forms a flammable mixture of gases within the system, it can be ignited by the pilot burner at the flare tip. If the flash back velocity of the mixture exceeds the efflux velocity, the flame will propagate backward into the flare stack and explosion is likely to result. If the flashback velocity is close to the forward flow there could be a steady combustion inside the flare stack that could lead to overheating and mechanical failure.
Some of the reasons leading to flashback:
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