And by the way, sway braces are not used to absorb vibration. Wrong application.
And i can back this claim with several tech articles and books related to the
use and mis-used of sway strut.
- Original Message ----
From: Farhad <farhad_ss@yahoo.com>
To: PipingDesign@yahoogroups.com
Sent: Saturday, April 7, 2007 10:19:42 AM
Subject: [PipingDesign] Re: Vibration
Imran,
How can you solve a vibration problem without knowing the forces and
displacements applying to a piping system?
First you must have an accurate & Real piping model which can be
created by CAESAR II. Then adding some pipe supports i.e. X,Y,ZROD
or sway-brace will absorb vibration.
Please refer to steps below that I've already posted.
Regards,
Farhad Salehi
- In PipingDesign@ yahoogroups. com, "jun_atibo" <jun_atibo@. ..>
wrote:
>
> I dont know Imran, but I doubt you could use CII to fix a problem
> related to piping vibration. Get a vibration analyst arm with a
tool
> to measure velocity and frequency to figure out the mode shape and
> severity (before and after) - is the way i would approach this.
>
> I would realy like to get an example of piping having a high
> vibration severity that was fixed using exclsuively CII.
>
> For the newbies, my suggestion is to Check out several articles
that
> appeared in Engineering Dynamics related to piping vibration. Or
> better yet the SwRI paper (no its not posted in their website but
if
> u knew somebody who have used the services of SwRI before then get
> of copy of the their fine article written about piping vibration -
> its very good).
>
>
> --- In PipingDesign@ yahoogroups. com, "Farhad" <farhad_ss@> wrote:
> >
> > Dear Imran,
> >
> > Definitely, you should use CAESAR II software to solve this
> problem.
> > There are a few steps as follows:
> >
> > 1- Collect field data (displacements, RPM of pumps, pipe support
> > configuration, etc.)
> > 2- Model piping system in CAESAR II.
> > 3- Run static analysis.
> > 4- perform Harmonic analysis and enter harmonic displacement at
> pump-
> > pipe node.
> > 5- Tweak some dynamic parameters to model exact problem.
> > 6- Add some stiffness (pipe support) to your piping system,
> wherever
> > possible.
> > 7- Run static then dynamic analysis to see changes.
> >
> > I hope it helps you.
> >
> > Regards,
> > Farhad
> >
> > --- In PipingDesign@ yahoogroups. com, "Imran M Ahmed" <imahmed@>
> > wrote:
> > >
> > > Hello Guys!
> > >
> > >
> > >
> > > We are facing vibration problem in the piping system of our
> plant.
> > The
> > > scenario is that the lean Amine pumps operate with a vibration
> of
> > approx
> > > 6 mm/sec pk on DE and 3.8 mm/sec pk on NDE. The vibration gets
> > > transmitted through the piping into the standby pump which is
> not
> > in
> > > operation. The vibration recorded on the standby pump is
> > approximately
> > > 3.0 mm/sec pk. Do you have suggestion how to control this
> > vibration?
> > >
> > >
> > >
> > > Regards,
> > >
> > >
> > >
> > > Imran Ahmed
> > >
> > >
> > >
> > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> >
>
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[Non-text portions of this message have been removed]
Received on Sat Apr 07 09:33:00 2007