r₁ = 0,8 dₐ 

r₂ = 0,154 dₐ 

h₁ ≥ 3,0 s

h₂ = 0,255 dₐ – 0,635 s

Volume of the curved section (without shelf height h₁) V ≈ 0.13 (dₐ - 2s)³

Outer surface of the curved section (without shelf height h₁) | Aa ≈ 1,08 * dₐ²

Inner surface of the curved section (without shelf height h₁) | Ai ≈ 1,08 (dₐ - 2s)²

Largest wall thickness | s ≤ 0,01 dₐ; max. 20 mm

If s = minimum wall thickness, please specify on enquiry.