Question

A thin gas cylinder with an internal radius of 100 mm is subject to an internal pressure of 10 MPa. The maximum permissible working stress is restricted to 100 MPa. The minimum cylinder wall thickness (in mm) for safe design must be ____

• A. 10

Answer 1

The correct option is A 10
${\sigma }_{working}=\frac{pd}{2t}(d=2r=200mm)$

$t=\frac{pd}{2{\sigma }_w}=\frac{10\times 200}{2\times 100}=10mm$