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Support Design For Skirted Cone Bottom Tank
3

Support Design For Skirted Cone Bottom Tank

Support Design For Skirted Cone Bottom Tank

(OP)
API 12F shows a diagram for support of a skirted cone botton, but does not go into detail regarding how to size the support rings.
I also have a tank design program at work which will give design thickesses for a cone bottom based upon cone slope, size of tank and internal pressures.  This design is based upon the cone being supported by an earthen foundation and not a steel skirted cone bottom.

If anyone has suggestions as to how to determine the number of and thickness of supports for a skirted cone bottom tank I would appreciate it.  For reference, the largest diameter tank our facility produces is 23'-6".

RE: Support Design For Skirted Cone Bottom Tank

2
You can check the design of the cone bottom and the compression ring region using the rules in API-620.

The skirt itself can be designed by rules in API-620 or elsewhere.  Basically, the skirt is designed as a short beam, with stress = P/A + MC/I.  The missing part that you need is allowable stress for a thin cylinder.  That can be found in API-620 as well as AWWA D100.  AISC ASD also includes compressive stress within certain limits.

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