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Re: Stack Strakes

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Strakes are normally flat bars rolled or cut from plate to fit the stack. The width is about 10% of the stack diameter. They are installed in a helical pattern in sets of three; they are normally sloped so as to make one complete revelation of the stack in 5 diameters of height. They are normally installed over the top third of the stack height. They are fairly common; I'm sure you've seen them either in real life or in photographs.


H. Daryl Richardson

----- Original Message ----- From: "Drew Morris" <dmorris(--nospam--at)>
To: <seaint-seaosc(--nospam--at)>
Sent: Friday, February 01, 2013 3:21 PM
Subject: Re: [SEAINT-SEAOSC] Stack Strakes

I don't do stacks or chimneys, but I have seen this term strates used before in SEAINT. What so these things look like? I didn't find much useful information on Google other than they breakup the airflow.

On 2/1/2013 10:01 AM, h.d.richardson(--nospam--at) wrote:
Fellow engineers,

I have a client who manufactures flare systems for the oil and gas
industry.  A major component of these systems is the flare stack itself.
These stacks vary from 40' to 80' tall with the top 6' to 10' varying from 4" to 8" stainless steel pipe with a burner tip at the top.

Occasionally, vortex shedding may be a concern; my client is
willing to go to almost any length to avoid the use of traditional strakes. My question "What do you think of the idea of creating strakes by wrapping the top third of the stack with wire rope and securing the rope to the stack with clips that are tack welded to the stack?" The cost of wire rope strakes would seem to be only a small fraction of the cost of

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