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

## Values for calculation

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

## Calculation

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

$$P_a=\cfrac{4\cdot B}{3\cdot\left(D_L/t_e\right)}$$$$P\le P_a$$

### Requirements

$$D_L/t_e \geq 10$$