×
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

Vessel subjected to full vaccum

Vessel subjected to full vaccum

Vessel subjected to full vaccum

(OP)
I am checking the shell thickness of a 2232mm dia pressure vessel x 4077mm long. The design ambient is 40 C and material is boiler plate. Design pressure is atmospheric to full vacuum. Vessel is not stiffened.

Using ASME code, factor A by formula is 0.0017, factor B is 25992.4, I get an allowable pressure of 17.1 bar. Or to put another way, allowing for 2 bar external pressure for full vacuum, I only require 5.5mm thickness.

Vessel will be made 16mm thick and I would not change without full calcs done. But I would like to have an idea if the material thickness could be reduced.

Using the PDQ$ formulas I get 12.65 bar at 16mm or at 2 bar external pressure - 7.8mm.

Can anybody confirm these values.

RE: Vessel subjected to full vaccum

Unbound,

Without knowing the material spec of your "boiler plate", my quick and dirty spreadsheet (based on ASME VIII) tells me that you would need at least 9.5mm shell thickness if you didn't have stiffeners. That's using SA516-70 though, and 2:1 SE heads (and no corrosion allowance). I used 1 Barg as the external pressure as well.

Regards,
John

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