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Thickness of shells under external pressure for Cylinders having values $D_o/t< 10$

Values for calculation

$ T $ $ \mathrm{°C} $
$ P $ $ \mathrm{MPa} $
$ D_o $ $ \mathrm{mm} $
$ L $ $ \mathrm{mm} $
$ t $ $ \mathrm{mm} $
$ D_o/t $
$ L/D_o $
$ A $
$ B $ $ \mathrm{MPa} $
$ S $ $ \mathrm{MPa} $

Calculation

Calculated value of maximum allowable external working pressure 1 for the assumed value of $ t $

$$P_{a1}=\left[\cfrac{2.167}{D_o/t}-0.0833\right]\cdot B$$

Calculated value of maximum allowable external working pressure 2 for the assumed value of $ t $

$$P_{a2}=\cfrac{2\cdot S}{D_o/t}\cdot \left[1-\cfrac{1}{D_o/t}\right]$$

Requirements

$$ D_o/t < 10 $$ $$ \min\left(P_{a1}, P_{a2}\right) \geq P $$