# 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

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