×
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

Hydrogen pressure vessel

Hydrogen pressure vessel

Hydrogen pressure vessel

(OP)
Hi to all,

I'm about to design a pressure vessel (VIII-1) which his service have a low concentration (3%) of hydrogen. Material selected is 316L for the design pressure of 500 psig (-20F to 140F).  Is there any restriction for design and fabrication?
-reinf. pad not recommended?
-full penetration weld only?
-pwht required?
-xrays required?
-threaded connections?
-flanged connections?
any things else missing?

thanks in advance.

RE: Hydrogen pressure vessel

nhtien;
Please consult with an experienced pressure vessel design engineer. Your questions indicate you are in over your head in terms of pressure vessel design.

RE: Hydrogen pressure vessel

metengr is right, you should get a consult on this other than this forum banter.  It may not be just the concentration, but more a factor of partial pressure.  But to reinforce your current direction:

1. if you can get away without using repads, that's great, although it might be difficult at that pressure, unless you beef up the shell thickness and/or specify one piece integral nozzles such as LWN, HB, etc
2. yes to full penetration for butt welds
3. do NOT pwht austenitic stainless steel (you can, but it is usally advised against, but that's a whole other topic)
4. 100% xrays above and beyond RT-1
5. no to threaded connections (hydrogen has a tendency to bypas threaded connections)
6. yes to flanged connections (see 1 above)

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