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Flare Stacks bent

Flare Stacks bent

Two flare stacks were reported bent at the same time at an Oil&Gas plant, most probably cause "High Temp degradation", is strenghtening them good idea as a temporary mitigation measure?

RE: Flare Stacks bent

You need to turn the fire off and investigate what's left of them before you can possibly make that decision. While they're cooling off, design and get another one on order.

"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek

RE: Flare Stacks bent

Not sure how you field-fix that. Looks like the next stack ought to be free standing, though, considering what the guy wires appear to be accomplishing in the overall scheme of things.

RE: Flare Stacks bent

What Big-Inch said, I'd get another stack on order as a precaution.

What sort of backflow preventer do you have on that flare stack? What about assist gas for smokeless combustion?

We had a vertical flare stack where I noticed one night the metal was red-hot at the base of the mol seal, turns out we had the center assist steam coming on first when it was supposed to come on last, apparently resulting in combustion below the tip. Changed around the order and that was the end of the problem. I heard of another 45 degree inclined flare tip up on the North Slope that had internal burning (never heard just why) until the whole thing just laid over on its side. It looks like for some reason you've had internal burning down in the flare stack.

RE: Flare Stacks bent

Thanks for all inputs.
We are also suspecting internal burning due to problems on separators.
What about shorter the flare stacks, to remove the more affected portion of them?

RE: Flare Stacks bent

Shortening the stack would result in excessive radiation.

RE: Flare Stacks bent

If the surrounding body of water is permanent, I would not be all that concerned about radiation. If the stack was any shorter, it might as well be a flare pit.

Assuming you won't be able to get near it while it's flaring, I am inclined to go out there with UT apparatus and see what metal you have available to work with. If it's in any way salvageable, cut below and above the kink and weld a 2 foot piece into the middle, and remove the guy wires.

Otherwise, by visual observation of the facility in the background, I don't think I would be devoting a lot of time to coming up with a low cost fix for this somewhat toasted piece of pipe.

If shutdown outage is the issue, then in my opinion the best thing you can do at this point is take the guy wires down and let the thing last as long as it lasts. The minute you are forced to work on it, it looks like replacement is the best option.

RE: Flare Stacks bent

It's the old repair it as cheap as possible philosophy again. Endemic mind set in certain regions. False economy. That's why I said get another one on order way up there at the top. A shutdown of that plant is going to cost at least 1000 x a new flare.

"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek

RE: Flare Stacks bent

Is that the mother of all bunsen burners?

RE: Flare Stacks bent

Whatever it is, the outer cylinder has failed structurally and the recommendation is the same.

RE: Flare Stacks bent

I also guessed its a bunsenburner type flarestack. never heard about them although i though about it. But then i got to think about that little "puff" there is when you turn off the burner in the lab and i tried to multiply this a couple of thousand times....

@evaristo10: Do you know if it is a bunsenburner - and have you been around when you turn it off?

Best regards


RE: Flare Stacks bent

Hi MortenA, no technical information is available and I've never around when it was turn off.
I'm planning a close visit to check about three pipes coming inside the stack.

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