Thickness of shells under external pressure for Conical Heads and Sections $D_L/t_e< 10$

Values for calculation

$P$ $\mathrm{MPa}$
$T$ $\mathrm{°C}$
$α$ $\mathrm{°}$
$t_e$ $\mathrm{mm}$
$D_L$ $\mathrm{mm}$
$L_e$ $\mathrm{mm}$
$L_e/D_L$
$D_L/t_e$
$A$
$B$ $\mathrm{MPa}$
$S$ $\mathrm{MPa}$

Calculation

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

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

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

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

Requirements

$$D_L/t_e \le 10$$$$\min\left(P_{a1}, P_{a2}\right) \geq P$$