Is it a Pipe or a Vessel

FAQ - whether a unit being made part of a piping system is classified as piping or as pressure vessel. Both Section VIII and B31 is not clear on this. Or put in another way, when is a "unit" called a piping or a pressure vessel. Note that some "unit" are fabircated completely out if piping and piping components yet it isclassified as pressure vessel. Received on Thu Jul 19 04:40:00 2001