May I suggest you check out the Engineering Dynamic, Carmagen websites and those
of the SwRI - they're good. We have hired the services of EDI in the past and so
we're familiar with their methodlogy.
Since we have also our in-house vibration lab as part of the Rotating Equipment
group functions - we deal with vibration almost on daily basis.
We got the complete suite of Coade (among other engineering apps) and cert to
used their software.
Been involved in almost 3 decades of process piping works
(design/fab/installation/maintenance) besides the other mechanical equipment
such as pumps, compressors and turbine in heavy industries and taught the young
engineers in our plant (its big and we're listed in the world top 5 producers)
how to perform a piping vib analysis using the right tool. We have also
participated (as resource speakers) in several conferences related to Plant
Maintenance in several countries.
CII is not the right tool in performing vib analysis of piping already
in-service. A call from Coade will easily validate what I have said.
- 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]
> > >
> >
>
________________________________________________________________________________\
Be a PS3 game guru.
Get your game face on with the latest PS3 news and previews at Yahoo! Games.
http://videogames.yahoo.com/platform?platform=120121
[Non-text portions of this message have been removed]
Received on Sat Apr 07 09:15:00 2007