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Re: Vortex Shedding on Stacks - Vertical Strakes

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I designed a 30" diameter stack approx 30 years ago.  I used vertical strakes in short lengths and offset each one from the other, sort of like risers in a stair.  I have never heard anything but as far as I know the stack is still there.

On 2/22/2011 12:01 PM, Harold Sprague wrote:
Those familiar with vortex shedding will note that ASME STS 1 discusses strakes as does API 560.  Both API 560 and ASME STS 1 have provisions for helical strakes.  API 560 allows for vertical strakes ASME STS 1 does not. 
Has anyone ever studied whether or not vertical strakes are effective?  Are there any published papers?
My own personal experience is that vertical strakes do not work.  But since the vertical strakes are cheaper (especially in repairs), there is a desire to use them.

Regards, Harold Sprague

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