×
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

-20degF Vessel for PED

-20degF Vessel for PED

-20degF Vessel for PED

(OP)
I am redesigning a small vessel for use in Europe at -20F (-29C). Currently it is made of SA53B,E shell, SA414G heads, SA36 machined nozzles. My understanding is that these materials cannot be rated -29C in Europe without impact testing. But I understand that I can achieve -29C if I switch to SA524 shell, SA516-70 (normalized) heads, and SA516-70 (normalized) machined fittings AND FOLLOW THE FOLLOWING STEPS:

1) Limit carbon content to .23%, Phosphorous to .035%, Sulfur to .025%
2) Employ Fig UCS-66 to show -55F at 20J impact
3) Adjust to 27J using API579

I would appreciate hearing comments on how sensible this plan is, and if there are better material choices than I gave.

RE: -20degF Vessel for PED

European regulations require all ferritic materials to be impact tested at or below the minimum operating temperature, but not greater than 20C, with an energy no less than 27J. Sorry but you can't use the charts to get out of the impact test you just have to do it.

RE: -20degF Vessel for PED

YEP...Gotta impact it all.  Just finishing up our first and hopefully last set of PED jobs.

make sure all materials come from ped certified sources.
make sure a ped certified lab does all tests.

make sure your nde contractors are ped certified.

make sure that your weld procedures were or will be witnessed by the PED certifying person.

RE: -20degF Vessel for PED

I think I once read the PED doesnt apply to vessels that were in use prior to when the PED was issued, and are now repaired.

Not sure if thats your case here, but since u're talking bout redesigning I thought I just mentioned.

As vesselfab indicated, you might want to ask for 3.1 certificates as per EN 10204.
Also, make sure your material is 'PED approved' (Annex I 4.2 (b)), which might require a PMA,
as ASTM material isn't a harmonized standard for the PED.

It might also be useful to read PED guideline 7/17 about when a material requires impact testing per PED (it's not always required).
 

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