×
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

Tank Bottom Flatness and Foundation Tolerances

Tank Bottom Flatness and Foundation Tolerances

Tank Bottom Flatness and Foundation Tolerances

(OP)
Hey Guyz!

I have a few queries regarding Storage Tank Bottom Flatness and Foundation Inspection. I hope you'll be able to guide me.

1. Looking at Inspection methods and tolerances for tank dimensions in API 650, there is no direct tolerances defined for bottom flatness. There is a reference for tolerances in Waviness and flatness in API 650 7.5.2 but its for tank plumbness.
Can it be used for bottom flatness as well?
If yes, what is the cross reference?
If no, what reference should be used?

2. Tolerances for Tank foundations are defined in 7.5.5 with reference to the Tank concrete ring wall. I have a case where the ring wall is well within the tolerances but the central part of the foundation is approx -+22mm from average values. I can find no reference to reject the foundation except simple logic that this uneven foundation will effect the tank bottom flatness and slope of the tank bottom.
Can anyone give me a better reason?

Thanks in advance guyz!

RE: Tank Bottom Flatness and Foundation Tolerances

I've never seen a tolerance for bottom flatness.  I recall a line, possibly in AWWA D100, saying that out-of-plane distortion of 1% of diameter was not out of the ordinary.

On the 22mm difference- if it's a large tank, I'd say that was a neglible difference.  If it's a small tank, it'd be more noticeable, but also easy to correct.

RE: Tank Bottom Flatness and Foundation Tolerances

Take a look in API 653, there are tolerances for tank bottom flatness, bulges and depressions.  

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