Pressure relief system for pressure vessels

Claim 1

IN A PROCESS FOR RELIEVING EXCESSIVE PRESSURE IN A PRESSURIZED POLYMERIZATION ZONE COMPRISING A SMOOTH CONTINUOUS PATH REACTION ZONE WEHREIN A MONOMER IS POLYMERIZED IN THE PRESENECE OF A CATALYST AND DILUENT UNDER CONDITIONS OF TEMPERATURE AND PRESSURE SUCH THAT ALL THE DILUENT IS IN THE LIQUID PHASE AND AT LEAST PART OF THE POLYMER PRODUCED IS INSOLUBLE, EXCESSIVE PRESSURE SURGES BEING RELIEVED BY A PRESSURE RELIEF VALVE CONNECTED BY A FLUID PASSGEWAY TO SAID ZONE PRESET AT A PREDETERMINED VALUE, THE IMPROVMENT COMPRISING CONTIANUOUSLY INTRODUCING SAID DILUENT INTO THE PASSAGEWAY CONNNECTING THE PRESSURE RELIEF VALVE AND SAID REACTION ZONE, SAID DILUENT HAVING PRESSURE NOT EXCEEDING SAID PREDETERMINED VALUE AND HAVING CONTINUOUS POSITIVE FLOW TOWARD SAID ZONE, THEREBY PREVENTING CONTACT OF THE CONTENTS OF SAID ZONE WITH THE RELIEF VALVE.