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]
  > > >
  > >
  >