Re: Vibrations due to Vortex Shedding

From: <Sajit>
Date: Thu Jan 13 2005 - 12:58:00 EST

Are the Vortex breakers the same as the guides or is that the guides serve as stiffening members to the column. Can anyone please post a picture of it.

Sajit

• Original Message -----
  From: Steve McKenzie
  To: <a href="/group/PipingDesign/post?postID=_o71MTPPpiBIhsGj-iXiHCSiTS6dMro6LbW29zqVf3AgyOdt1VlhlhWY6CotuUMyOjOL8qzVuP4tEUVATH4lUUydLD8">PipingDesign@yahoogroups.com</a>
  Sent: Thursday, January 13, 2005 2:26 PM
  Subject: RE: [PipingDesign] Vibrations due to Vortex Shedding
  

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=_o71MTPPpiBIhsGj-iXiHCSiTS6dMro6LbW29zqVf3AgyOdt1VlhlhWY6CotuUMyOjOL8qzVuP4tEUVATH4lUUydLD8">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]

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[Non-text portions of this message have been removed] Received on Thu Jan 13 12:58:00 2005