The design of thin-walled vessels under internal pressure

THE DESIGN OF THIN-WALLED VESSELS UNDER INTERNAL PRESSURE 

For a cylindrical shell, the minimum thickness required to resist internal pressure can be determined from equations 13.7 and 13.8. 

If Dj is internal diameter and t the minimum thickness required, the mean diameter will be (D, + t) substituting this for D in equation 13.7 gives 

If we allow for the welded-joint efficiency, E, this becomes 

The equation specified by the ASME BPV Code (Sec. VIII D.l Part UG-27) is  

---

Their design does not fall into the category of thick-walled, high-pressure vessels but rather into the field of thin-walled pressure vessels. The basic equations for thin-walled vessels under internal pressure show that the radial stress in a shell may be neglected because it is small, with a maximum... 

---