×
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

Modelling of pipe support at pump inlet

Modelling of pipe support at pump inlet

Modelling of pipe support at pump inlet

(OP)
Hi,

I have a tee (with blind flange) at the pump suction instead of more commonly used elbow. There is an eccentric reducer with the inlet nozzle, then a tee with blind flange and vertical pipe (see the sketch attached). The pipe is supported at tee and pump is supported at centerline of the nozzle.
The question is where to apply the restraint in CAESAR model, at centerline or at the bottom of the pipe with an offset element? If I apply restraint at the bottom of the pipe nozzle loads are very high in vertical direction.

In our company we apply restraint at centreline but I would like to have opinion of other people in this field.

Thanks

RE: Modelling of pipe support at pump inlet

That is an indication that the support is too close to the nozzle.

A support from the floor to a pipe, where the pipe lifts off of it in the upward direction during operation (the support does not move) will be no help after the pipe lifts off the support, All pipe weight will be taken off the support and thrown onto the pump nozzle.

The pipe between support and nozzle should be long and flexible enough to rest on the support both during the cold and hot conditions without putting undue stress on the nozzle in either situation.

"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek

RE: Modelling of pipe support at pump inlet

Don't look for results that make your job easier, look for results that are in line with reality. This approach hasn't always made me popular, but I haven't killed anyone or shut a plant down yet.

Which case is closer to reality? Can you justify using the more real case?

- Steve Perry
This post is designed to provide accurate and authoritative information in regard to the subject matter covered. It is offered with the understanding that the author is not engaged in rendering engineering or other professional service. If you need help, get help, and PAY FOR IT.

RE: Modelling of pipe support at pump inlet

Hi,

What is your temperature? What is the nozzle and reducer sizes? Is this an API pump so you compare your loads with API-610?

Where do you locate your anchor point? At the nozzle? Center of the pump? If at the nozzle, do you apply nozzle displacements to it?

There are unknowns which make it hard to help.

Frank


RE: Modelling of pipe support at pump inlet

mw2005:
If your Pump is a Center-Line Supported design then your pipe support should also be a Center-Line Supported design.
Your CAESAR results should prove this correct.

prognosis: Lead or Lag

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