When the ratio of inner diameter of the cylinder to the thickness is less than 15, the cylinder is called as a 'thick-walled' cylinder or simply 'thick' cylinder.

Examples-Hydraulic Cylinders, high pressure pipes, gun barrel

Formulae list:-

(1) $\sigma_{t}$ = Tangential stress(Tensile)

$\sigma_{t}$ = +$\frac{P_{i}(D_{o}^2+D_{i}^2)}{D_{o}^2-D_{i}^2}$

(2) Radial stress (Compressive), …