×
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

PD 5500 Annex G Used For Vessel Flexibility Interpretation

PD 5500 Annex G Used For Vessel Flexibility Interpretation

PD 5500 Annex G Used For Vessel Flexibility Interpretation

(OP)
Hi,
Trying to make sure I'm not doing something really dumb. Working with pipe support guys to see how a new piping arrangement effects an existing pressure vessel nozzle. Nozzle is on a cylindrical shell, perpendicular to the shell.
Looking to calculate the vessel spring constant (flexibility) for the pipe support guys to use. Can I simply take an arbitrary load, apply it to the nozzle using PD5500 annex G (specifically G.2.4.2) get a deflection, then divide by the original load to get a constant in mm/N?
Seems a little too straight forward, hence the query?

RE: PD 5500 Annex G Used For Vessel Flexibility Interpretation

I wouldn't recommend using PD5500 Appendix G for flexibility without experience or testing.

PD5500 calculates a deflection between half and twenty times what you would get from an FEA analysis (depending on geometry). The enquiry case 5500/137 in the back of PD5500 appears to have allot of detailed work dedicated to nozzle flexibility so may yield accurate results.

WRC 297 is allot more accurate for pipe flexibility but still has certain geometries that are more rigid than FEA.

They are all calculated based no elastic properties of the material, so your method of finding the spring constant seems reasonable.

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