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Spliced Center Columns

Spliced Center Columns

Spliced Center Columns

I am having trouble sourcing a center column for a 50' tall tank that is long enough in one piece(24" std wt pipe).  I have heard that our old tank expert did not allow splicing of the tank center columns.  I would think that with proper testing of the weld and insuring the column remains straight this shouldn't be a problem.  Does anyone have any experience with splcing tank columns?  Is this a no-no in the industry?

Thanks for any responses.

RE: Spliced Center Columns

It's not uncommon.  The main concern is straightness, not so much weld inspection.

RE: Spliced Center Columns

Are there any Codes that give guidlines on straightness of the columns?  AISC?

RE: Spliced Center Columns

Splice away - it is very common.  Be wary of splcing with a plate (some might think that two fillet welds are easier to do than a butt weld) since it creates trouble for cleaning in the future.   

RE: Spliced Center Columns

If you are concerned with the straightness, consider the deviation of the column axis from the compression axis at the ends as inducing a bending moment with the deviation being the moment arm. Then combine the axial and bending stresses by addition or sum of squares and compare to allowable. For a column to need splicing, it should be long enough for buckling to be the failure mode and the resulting stress reduction enough to overcome weld efficiency at the splice.

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