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


Water tank ring foundation partial removal

Water tank ring foundation partial removal

Water tank ring foundation partial removal

I been asked if for the repair of a pipe portion of a nozzle close to bottom/base of tank wall on a large condensate tank(72'-7" dia.), they can remove part of foundation ring to cut out a discharge flange?

Tank is empty.

Don't know what to tell them?

RE: Water tank ring foundation partial removal

Do you have the original calculations?

Good chance the foundation is designed for hoop stresses, which cutting away a portion of would compromise.

Brian C Potter, PE
Simple Supports - Back at it again with the engineering blog.

RE: Water tank ring foundation partial removal

Without knowing the details, my initial thought is "There's got to be a better way".

Most commonly, tank ringwalls are poured as one pour, no joints. However, it is not uncommon for them to be poured in quadrants or otherwise segmented with construction joints, and a few engineers insist on them being built that way. As Brian notes, primary loading is hoop stress. If you can remove a section and manage to tie back in to the existing hoop steel, you should be able to match original design. It would simplify things if there were no lap splices in that vicinity.

If the existing pipe is concrete-encased, it may be easier to abandon it in place and put a new underground pipe to one side of it.

Also consider abandoning the underground pipe and adding a shell nozzle (and insulation if required).

RE: Water tank ring foundation partial removal

If tank is short and squat the foundation may have been designed as "self anchored" for seismic. And ring foundation serves only to retain fill under tank bottom, support weight of sidewall and anchorage for tank in wind (when empty). Small anchor bolts may be supplied for wind anchors.
If that is case, you could cast concrete under nozzle for continuity of ring wall.

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!


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