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Deficiencies for Skirt Opening

Deficiencies for Skirt Opening

Deficiencies for Skirt Opening

Dear All,

How can I resolve below deficiency ? my standard drawing from Customer says to consider 12" sleeve on skirt for a 4" flanged pipe outlet . But if I go higher than 6", I receive below deficiency! How can it be resolved? my tower(skirt) diameter is just 18".
Any prompt help is highly appreciated.

Deficiencies for Skirt Opening #2 (SO #2)
Operating Hot & New Weight Compressive (governing): 4.5.17: Opening diameter (7.981 in) is greater than 25% of the Support Skirt #1 diameter (0.25*25.8113 = 6.4528 in).

RE: Deficiencies for Skirt Opening

You would either need to change the design or perform a more advanced analysis. Compress uses the design by rule methods of ASME Sec. VIII-2 to evaluate skirt openings. Those rules are limited to openings less than 25% of the shell diameter. VIII-2 requires that the opening be designed using design by analysis procedures if this 25% criterion is exceeded. Given the size of the opening compared to the skirt, local buckling would likely be a concern.

RE: Deficiencies for Skirt Opening

Thanks for your reply. Generally speaking when we use skirt support instead of Legs. in my case the vessel dia is 24" and the height is 24'

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