Stiffening Rings for pressure vessels

[rollingstein]

To guard against buckling modes I know that circumferential stiffeners can strengthen a cylindrical vessel against external pressure / internal vacuum.

Question: Stiffer rings do not contribute anything to protect vessel against internal pressure, correct? I think not, based on Stress eqs. and my understanding. But just wanted to verify my understanding.

 

[AlephZero]

As a general rule, structures buckle because the stress field has at least one principal stress in compression not in tension, so you don't need any "protection" against buckling for a vessel with internal pressure.

Stiffening rings may be useful design features on a pressure vessel for other reasons, of course - for example to "spread" the local stresses at mounting points, pipe connections, etc.

 

[rollingstein]

As a general rule, structures buckle because the stress field has at least one principal stress in compression not in tension, so you don't need any "protection" against buckling for a vessel with internal pressure.

Stiffening rings may be useful design features on a pressure vessel for other reasons, of course - for example to "spread" the local stresses at mounting points, pipe connections, etc.

Thanks! That makes sense.