A thin cylindrical shell has an internal diameter of $2400$ mm and is made from steel plate

$12$ mm thick for which the yield stress in tension is $300M\frac{N}{m^2}$ and in compression is $1\mathrm{.}50$ g $.$

Determine the internal pressure $\text{'}$ p $\text{'}$ which would cause yielding according to:

i$)$ the maximum principal stress criterion;

$(3M\frac{N}{m^2})$

ii$)$ the maximum shear stress criterion;

$(3$ MN$/$m $($:$m^2$