Online Spalling (OLS)
-Benchmarked the participants. EOR typically 1250F, 18-24hr spall time (oil in/out), & most thermocycle
-High Na in feed can lead to hard coke and OLS difficulty
-Group benchmark. Wide range of 1-15 psig drum pressure prior to opening vent.
-Group estimates EPA will likely mandate <2 psig soon
-Dont just monitor COT but also Drum vapor temp to ensure adequate cracking activity and less foam make for certain feeds (esp. hydrotreated/cracked feeds)
-Refoam can result from unconverted feeds similar to above at end of cycle. Temp rate at end or higher COT may prevent this
-Antifoam (AF) is best injected with a 180o opposed vertical nozzle with a small stub into the drum. However, side entry AF nozzles have been shown to have limited detrimental effect on AF performance.