Innovative repairs on a cracked nozzle for a fluid coker burner vessel

摘要

Innovative engineering repairs were performed on a cracked nozzle for an operating fluid coker burner pressure vessel. The repairs consisted of identifying the damaged nozzle by inserting a camera into the bottom head of the operating burnervessel via an accessible coke withdrawal nozzle. Real time viewing of the video identified the nozzle which was leaking coke into the bottom head of the pressure vessel. The hot coke threatened the pressure vessel integrity and the ability of the unit tooperate until its scheduled turnaround date.The repair process consisted of welding and hot tapping two new nozzles into the leaking nozzle and injecting a "liquid" refractory material into the annulus of the leaking thermal sleeve nozzle to seal the leak. The refractory material was allowed toharden and has successfully scaled the leak.The alternative to the in-situ repairs was an unscheduled plant shutdown. The repairs have saved shutdown and lost production cost which are estimated in excess of