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!

*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

flange thickness - pressure test (circular plate)

flange thickness - pressure test (circular plate)

flange thickness - pressure test (circular plate)

What is the minimum thickness a flange (circular shape) has to have on a equipment to be used on a pressure test?
The data is:
inside diameter = 408 mm
diameter of flange = 580 mm
Pneumatic pressure test = 13.5 Bar
Material of Flange = A106 GrB (Carbon steel)


RE: flange thickness - pressure test (circular plate)

Life safety is the primary issue here. A failure during a pneumatic test can be as destructive as a bomb going off due to the large amount of energy stored in the compressed air or other medium; a hydrostatic test is safer in this regard.

ASME Pressure Vessel Code Section VIII Div 1 Appendix 2 provides rules for design of flanges. You can find some links to freely-available design spreadsheets by searching Eng-Tips (try the ASME or Boiler/Pressure Vessel forums) or do a Google search.

The thickness of the flange is a function of the bending moments produced by the gasket reaction forces, bolting forces, pressure end forces, etc, so the layout and size of bolts also enters into this. It is not a trivial problem.

RE: flange thickness - pressure test (circular plate)

You should be able to buy a rated blind flange from a steel pipe manufacturer.  If you're the nervous type, specify one with a higher rating than your test pressure.  Your pressures (200 psi) and size (16 in.) are not excessive.
I'd would not recommend designing this from scratch.  If you want to feel involved, check the manufacturer's design.

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! Already a Member? Login


Engineering as It Should Be - Chapter 2: Document Security
This ebook covers basic tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Chapter 2 covers cybersecurity and answers the question: How do you secure your files and documents? Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close