Good morning to everyone, I work for a company which has recently started operating a 2 drum coker unit. We have had 5 online spallings since we started operating the unit (6 passes heater).
The result of the different online spallings has been quite good in an overall view according to STK temperatures (up to 70-80ºC in some cases), but not that good in the coil pressure, which has not gone down after the spalling and in some cases it has even gone slightly higher after the spalling, when we have put feed in again.
This pressure, after a few days (couple of weeks), has been going down but not as much as desired.
My question is whether some of the coker operators have suffered this problem and if you know how to avoid/improve this effect in the pressure after the spalling.
Up to now it is not a problem because we are not limited in coil pressure nor in control valve feed OP, but if it continues as we make more and more online spallings will become a problem in the future for sure.
Any suggestions/recomendations will be appreciated.
Kind Regards,
Carlos.
