×
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

piping strain issues

piping strain issues

piping strain issues

(OP)
how can i eliminate piping strain from two acid condensate pumps running on same suction and discharge header after correcting piping strain then adding bellows on both suction and discharge lines vibration readings still high

RE: piping strain issues

If you have pump vibration, piping is probably not affecting that much one way or another, although the reverse is not necessarily true.

What kind of pumps, centrifugals, recip??  How big, etc.

From "BigInch's Extremely simple theory of everything."

RE: piping strain issues

What makes you think that the vibration is caused by pipe strain?  

Johnny Pellin

RE: piping strain issues

I would consider getting rid of the bellows on the suction and discharge.  You have unbalanced forces and if it is great enough the pump will move.  The best joint is a flanged joint.  If you have a victaulic coupling, between the check valve and isolation valve, install tie rods across the coupling  

RE: piping strain issues

By adding bellows you might actually have made your problem worse.  If I was doing this I would do a full flexibility analysis of the piping to  figure out where your pipe strain problem is coming from.  Pipe strain comes from lots of root causes: support foundations settling, pump foundation settling, etc.  Then I would see if I needed bellows.  A bellows should be the l-a-s-t resort to fix a pipe strain problem.  Either get the Caesar (or equal) software and do the analysis yourself or else hire a consultant.  To do otherwise is just wasting time and money.  BTDT.   

RE: piping strain issues

Vibration is likely coming from pump operating to the right of BEP, poor inlet conditions or cavitation. The piping vibrating and transferring this to the pump body is unlikely with bellows on suction and discharge.

If indeed the piping is vibrating then  you could add pipe supports to prevent the piping vibrating.

"Sharing knowledge is the way to immortality"
His Holiness the Dalai Lama.

http://waterhammer.hopout.com.au/

RE: piping strain issues

I agree with stanier...

Most pump vibration is a result of operating too far from the pumps BEP.

Based on field measured data, at what percentage of the BEP are you operating ?

Additionall, have you checked pump/baseplate anchorage ?

Are you certain that you do not have "soft foot" conditions ??

   

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