Let's say you have a pressure vessel that has been in service for 5 years, and it had a shell cylinder wall thickness of 1.5 inches when it was installed new. You want to know how thin you can allow the vessel wall to become before you have to replace it, so you calculate the thickness required...
In UCS-66 of the ASME BPVC SEC VIII DIV I, the figure used to determine the lowest MDMT without impact testing says that the MDMT without impact testing increases with increasing nominal wall thickness. What is the physics behind this? Why would a thinner wall pressure vessel be less...
