×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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

Non uniform external pressure

Non uniform external pressure

Non uniform external pressure

(OP)
Dear all,
I am looking thoroughly on the topic of a non-uniform external pressure on a buried horizontal storage tank.
I can’t find any publication or guidelines to help achieve some kind of sets of equations to calculate the different stresses induced by a non uniform external pressure on a thin walled cylinder.
Can anyone please point me to a useful direction?
Regards

Detailing is a hobby,

RE: Non uniform external pressure

EEMUA Publication 190 covers mounded horizontal vessels, would be a good starting point.

RE: Non uniform external pressure

(OP)
Dear,
Could you attach the document.

Detailing is a hobby,

RE: Non uniform external pressure

Sounds like you need some sort of FEA analysis to me.

What sort of "non uniform" do you mean?

This is quite strange so won't be covered by most normal equations.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Non uniform external pressure

(OP)
Dear LittleInch,
The nonuniform pressure is due to a load on top of the terrain in which the vessel is buried.
I’m kind of confused because usually the concrete and such above the tank withhold the forces, but in this case, they want the tank to withhold the above ground forces.
I have read briefly EEMUA PUB 190, and it can very well be used to calculate the loads, but i’m failing to understand how i should interpret them for a double skin storage tank.
Only thing I can think of (i dont know if it can work) is if i assumed this load as a uniform pressure from lets say -alpha to + alpha, and then treat it as per ASME VIII, and if it’s below the critical pressure of the outer skin, then it can hold it. Please any feedback would help.

Detailing is a hobby,

RE: Non uniform external pressure

(OP)


Also attached is a picture of the specification for any remarks.

Detailing is a hobby,

RE: Non uniform external pressure

You might check some of the references for underground piping, AWWA M11, for example, where this is a common loading.

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


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers 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. 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