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Re: vortex shedding

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1.  ASME STS-1-1992 (May be a later revision now) -- Steel Stacks.  You can
get from ASME 
1-800-843-2763.  You will probably have to call ASME after you get started,
because there are some  points which are not clear.

2.  I just got a reference which has a chapter on self supporting stacks. 
"Tubular Steel Structures, Theory and Design" by M.S. Troitsky, D.Sc.,
Published by Lincoln Arc Welding Foundation -- I ordered mine from Brown
Book Shop in Houston, 1-800-423-1825.  There's lots of material in this (50
pages, plus 2 1/2 pages of references), and it looks pretty good.  

3.  I also have a copy from somewhere (I don't remember) entitled, "Section
26, Chimneys", by Max Zar and Shih-Lung Chu of Sargent & Lundy.  

About spoilers -- They increase wind forces/moments, because they add a
large area near the top.  And stack constructors hate them (especially if
they have to be stainless steel), because they are very costly, both in
material and fabrication.  A possible alternate is to use a shroud to
control the natural frequency of the stack to stay out of the resonant

There are also mechanical damping systems available (One supplier, Warren
Engineering, Inc., Atlanta, Ga., 404-843-8333, FAX 404-843-0089).  They're
pretty pricey, but sometimes there's no other way, especially on an
existing stack.

Vortex shedding forces are not impossibly large, but it's easy to get into
a resonant condition with much lower wind velocities than you would
normally use for design.

BTW, I'm not a stack designer.  I get just enough stack work to keep me
challenged.  And I apologize for being long-winded.

Fountain E. Conner, P.E.
Gulf Breeze, Fl. 32561

> From: P.Rajendran <rajendra(--nospam--at)>
> To: seaint(--nospam--at)
> Subject: Re: vortex shedding
> Date: Saturday, July 25, 1998 8:09 AM
> I have been trying find some reference material for designing spoilers
> on tall stacks.  Your participation in discussing "vortex shedding"
> makes me believe that you may have some leads to the information I am
> seeking.  If you have such information, please respond to my email
> address which is: rajendra(--nospam--at)
> Thanks
> Rajendran