RE: Vibrations due to Vortex Shedding

From: <Dharmendra>
Date: Sun Jan 16 2005 - 22:52:00 EST

Thanks Steve,

I am now going through some theoretical basis for estimating the vortex shedding rate.

The seismic activity at the site location is very minimal, and hence wind loading will still be the dominant criteria.

Thanks again,
Dharmendra

Steve McKenzie <mechproj@xtra.co.nz> wrote: Hi Dharmendra

yes, guides will be fine. Once you have the design windspeed, you can work out the vortex shedding rate and adjust the guide spacing or pipe stiffness to achieve the required pipe natural frequency margin. I have never done this study on pipes, only on stacks, but the theory should be very similar. In many regions, the seismic requirements have a greater effect on design than vortex shedding, so I would check for the limiting case before designing the detail.

Cheers

Steve

-----Original Message-----
From: Dharmendra Hingorani [mailto:dharmendra_hingorani@yahoo.co.in] Sent: Friday, January 07, 2005 7:06 PM
To: <a href="/group/PipingDesign/post?postID=-8P8PF7MHOM5_7IDKoQNYcwwtboZPlCOD-AWjSzL24CJpEB2SjwmTdT5nNYRK90LHXcJwHcx2N6mEhMeMPvnFHJF">PipingDesign@yahoogroups.com</a> Subject: [PipingDesign] Vibrations due to Vortex Shedding

Dear All,

How to avoid vibrations induced in long vertical risers due to vortex shedding at high wind velocities?

Will guides at regular intervals be sufficient to prevent such vibrations?

Regards,

Dharmendra

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[Non-text portions of this message have been removed] Received on Sun Jan 16 22:52:00 2005