×
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

How to calculate head plastic buckling pressure during the hydro test

How to calculate head plastic buckling pressure during the hydro test

How to calculate head plastic buckling pressure during the hydro test

(OP)
I need a formula to calculate the plastic buckling pressure for a torispherical and an ellipsoidal heads.
What is ECCS formula for this plastic buckling pressure ?

RE: How to calculate head plastic buckling pressure during the hydro test

That subject has been addressed in a WRC Bulletin.  I suggest you go to their website and track down the bulletin number.  What is ECCS?

Steve Braune
Tank Industry Consultants
www.tankindustry.com

RE: How to calculate head plastic buckling pressure during the hydro test

(OP)
Steve

ECCS is European Convention for Constructional Steelwork and published the following document:
- "Buckling of Steel Shells, European Recommendations",   1988.

I need calcute the stress during hidro test for an ASME vessel. The formulas of ASME code (Addenda 2003), for torisherical heads, overestimate stress in this condition.

RE: How to calculate head plastic buckling pressure during the hydro test

Harvey's "Pressure Component Construction" Ch. 2.6.4 has a section on this.  Basically, if axis ratio a/b > 1.42, this can be a problem.

It makes quite a memorable sound when it goes, too [as in "what the #$%%#@ was that?"].

 We had one once on a "non-code" [as in "it doesn't have to be engineered, it's less than 15psi"] tank with shallow, thin ends ("to save $$").  The shop boys were leak testing the pipes, with city pressure in/ a partly open ball valve on the outlet for back pressure. A loud Boinnngggg resounded throughout the shop.  The tank knuckle-buckle looked just like the picture in Harvey.  Funny how the immutable laws of physics hold true, even when managers hold a meeting & decide they don't apply.  "Get out the fender tools, boys!!"  

RE: How to calculate head plastic buckling pressure during the hydro test

acbdcl

The pressure vessel design book by H Bednar has a formula for calculating the collaps pressure in dished ends.

Bogu

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