×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Flow induced vibration on piping downstream of PSV

Flow induced vibration on piping downstream of PSV

Flow induced vibration on piping downstream of PSV

(OP)
We have problem with our existing piping downstream of PSVs in our gas production platform. Result from process calculation shows that the blowdown downstream velocity  is too high, ie. Mach No. is greater than 0.7 and ñv2 is greater than 150,000 kg/m/sec2. Are there any software to be used to simulate the vibration induced from the blowdown of these PSVs or are there any engineering company who perform this type of work, especially in piping flow induced vibration.
Thank you very much for any informations.
Best Regards,
Chatri K.

RE: Flow induced vibration on piping downstream of PSV

Hello Chatri,

Computational Fluid Dynamics (CFD) software is now mature enough to estimate turbulence kinetic energy and frequencies through a PSV which can be translated into fluctuating pressures/velocities and frequencies.

That information can then be used as loads in a Finite Element Analysis (FEA) program for analysis.  FEA programs can model shells for the most important part of the piping immediately downstream and then transition to beam elements further away. Also, some of the more sophisticated FEA packages allow for random loads.

I would be interested to know if anyone else responded to this tough problem with a different answer.

Mike

RE: Flow induced vibration on piping downstream of PSV

I have solver many pipe vibrations problems due of autoinduced  control valves vibrations.

 It is important to check the control valve,  because when it is operating in a choked  or cavitating conditions, it generates a lot of vibration.In  many cases , we were forced to change the valve, when previously check was concluded that operated  at choked or cavitating conditions.


Regards,


SPLIT  

RE: Flow induced vibration on piping downstream of PSV

Chatrik,
Suggest you can get the following papers:
- Failure of Safety Valves due to Flow-Induced Vibration by J.T.Coffman; Oklahoma Gas and Electric Co. & M.D.Bernstein; Foster Wheeler Energy Corporation.
- Control of Flow-Induced Vibration in Safety Relief Valves by H.RSimmons, Sr. Research Center Engineer & R.M. Baldwin, Sr. Research Center Engineer; Southwest Research Institute. San Antonio, Texas.
I hope this helps.
Regards,

RE: Flow induced vibration on piping downstream of PSV

PSV piping design and associated pipe stress analysis should be routine for most engineering firms. Most piping analysis codes include provisions estimating pipe dynamics for your given supports and bracing.

The valve and piping support are critical especially for pilot operated valves.





Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources