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RE: Steel Water Storage Tank- Foundation Settlement Criteria

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API 653 "Tank Inspection, Repair, Alteration, and Reconstruction" standard,
Appendix B " Evaluation of Tank Bottom Settlement" may be of use to you.
The procedure is to determine if the settlement is either differential or
tilt settlement of the ringwall.  The method was written for large diameter
tanks based on elastic methods but should be adequate for most small tanks
in the diameter you noted.  Additional information is given for the interior
bottom settlement should you have access to the interior.


Ron Hill
HILL Consulting Engineering
Birmingham, Alabama  USA
Email: ronhill(--nospam--at)

-----Original Message-----
From: Lakhani, Sid [mailto:slakhani(--nospam--at)]
Sent: Wednesday, August 18, 1999 8:48 PM
To: 'seaint(--nospam--at)'
Subject: Steel Water Sorage Tank- Foundation Settlement Criteria

I am concerned about the safety of a steel tank.  The tank foundation (
concrete footing ring) has settled approximately one inch along the
Tank data:
Diameter= 45 ft
Heght=30 ft
Flat Bottom w/ 1/4 inch steel plate.
Tank designed per AWWA D100-96
One inch settlement is between two points on the footing diameter.
My questions are:
Is there any design criteria/guideline for steel tank settlement ?
What precautionary measures should be taken ?
Does any body has experience in eleviating similar situation ?
Thanks!   Sid Lakhani