Number of stifferner ring in tower

[axeus]

Hello, i sm not familiar with compress, but this is what i do in pvelite: i place one stiffener ring at or near the middle of each shell course. In your case, having a 30 meters shell, i imagine you split it in at least 12 courses each 2.5 meters, so it will be like 12 stiffening rings. Hope this helps.

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Thanks,

How do you calculate the stiffener size?