×
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

Flexibility analysis: criteria for cryogenic piping

Flexibility analysis: criteria for cryogenic piping

Flexibility analysis: criteria for cryogenic piping

(OP)
Besides the (obvious) minimum requirements per ASME B31.3, can anyone please provide me with some good general practice,
background reading or sources that elaborate on (piping design but more specifically) flexibility analysis for cryogenic piping service?

For example,
- PIP PNC0004 shows a graph that when T < -100 deg C, formal analysis is required (or comprehensive analysis when T < -155 deg C).
- other eng-tips topic (e.g. #268753) note that there are other rules of thumb for determining whether or not formal or comprehensive
analysis may be required, e.g. the 1500-rule (NPS x temp in F), the ASME para 319.4 'rule', etc ... But they mostly deal with 'hot' piping.
- there's a book by Nayyar, with a specific chapter on cryogenic piping (but I don't have the book, right now).

Any other suggestions/resouces/readings?

Note; the coldest service deals mostly with NPS <= 4, temperatures up to -196 C and AISI316 material.

 

RE: Flexibility analysis: criteria for cryogenic piping

(OP)
Anyone who has some thoughts/ideas?

RE: Flexibility analysis: criteria for cryogenic piping

It makes little difference whether you are considering hot or cryogenic pipe so far as analysis needs are concerned. It breaks down into three considerations:

What the fluid does to the pipe. That might be thermal shock, flow induced vibration, pressure both static and fluctuating etc.  

What the pipe does to the world ... what it is connected to / resting on, load limitations etc.

What the world does to the pipe ... imposed forces, displacments, vibration etc.

The second two are common to any pipe, hot or cold. The first is where major differences lie for cryo systems, in terms of brittle failure risk, icing of supports etc., and needs particular consideration. As regards, the specific need for comprehensive (computer based like Caesar II) stress analysis, these days it is economic to err on the safe side.
 

RE: Flexibility analysis: criteria for cryogenic piping

(OP)
Thanks C2it, this will keep me going for some time.
Do you have any references/sources (i.e. books) which may cover
methods for thermal shock, flow induced vibration, pressure both static and fluctuating etc.?
 

RE: Flexibility analysis: criteria for cryogenic piping

Have a look at Peng & Peng's Pipe Stress Engineering ISBN 978-0-7918-0285-4, published by ASME Press.

It's an excellent resource.  

RE: Flexibility analysis: criteria for cryogenic piping

(OP)
Again, thank you. Just ordered Peng's book, hopefully it'll be in within a week or so ...

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