We just completed pigging our Coking Heater and noticed that there was a significant amount of metal shavings in the drums where the pigging company emptied the coke removed from the heater. We have not noticed this in the past. Our heater tubes are 347 Stainless. Has anyone seen this issue and do you have any recommendations? Our concern is if this continues to happen it could result in significant metal loss over the course of repeated piggings. Also, it may increase the coking rate in the heater from having grooves for coke build-up. Any thoughts or suggestions are appreciated.
