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Earl   AST Forum  

Tank foundations

Tuesday, January 07, 2003   By: steve gordin phd se
Would somebody direct me toward the source of info (other than API650) on structural and geotechncial aspects of design of the foundations for steel gasoline tanks 90'dia, 50' tall?

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Tuesday, June 10, 2003   By:
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Wednesday, January 15, 2003   By: MJCronin
Have you considered "subbing" the tank design as well as the foundations out to a firm that does this as a specialty ?

This is a pretty big tank....

See: www.barr.com/PDFs/Factsheets/ASTanksrv.pdf as an example

many other firms do this type of specialty foundation work.....


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Wednesday, January 08, 2003   By: Lawrence
A dissertation was recently was published, two-days ago, on the broad and siphosicated topic of unanchored tanks. http://www.engr.csufresno.edu/~aelzeiny/PhdThesis/d_pre2.html Have not read it all but I am pleased.


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Thursday, January 09, 2003   By: Lawrence
We have a couple of rules about foundations for large tanks.

1 - Core soil samples are needed regardless 2- Tanks foundations are always place 100% on rock strata or 100% off rock strata but never in-between or over lapping both. 3 - Ring foundation as a minimum is needed regardless 4 - Seismic zone requires pilings around the ring tank foundation as a minimum 5 - The severity of the seismic zone determines whether a concrete slab is placed under the tank floor with supporting pilings. This is in addition to the ring/skirt/diaphragm foundation having pilings as well.

If this does not help you maybe, this will help others.


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Saturday, January 11, 2003   By: Murphy

A critical issue is the footer pressure has to be equal to the floor pressure when a ring foundation is used by itself. Othersize the settlement will occur witht the floor relative shell and vise versa.

I agree with you on the big picture.


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Published on ast-forum.com


Atmospheric Design Pressure
By: Fathi [46]

The whole story is to avoid brittle fracture=

Test temperature shall be equal or warmer than Minimum Metal Design temperature at Test pressure.

I would limit my minimum testing temperature for a tank (or even for a vessel or a piping system) by the =

Temp = maximum of [ Min(lower shell) , Min(shell# 2) ....Min (Upper shell) ]

For a Shell# i the minimum is function ( of shell tickness , Material group ) and this can be found in API 650 , Fig 2-1

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