Every once in a while we come across process vessels that are operating well above 15 psi and yet the vessel has no recognized design criteria and is far from being an ASME “coded vessel”. Most of the time the client is happy we discovered this, but there are those who will always challenge the RAGAGEP mentality. So it often comes down to the “show me” syndrome and like usual I go to my favorite place… State Fire Codes. Depending on which state you are in, the state fire code has some baseline pressure vessel requirements.