We installed VSS in 1996. In 2001 we opened up and had no problems. In 2005 we had a failure (coke build up) and we had a 4″ dimple around the outlet of the dome. We discussed going to a slip joint design in 2009 but chose to delay until 2013. The EJ had some issues but the dome had not gotten any worse. Another idea is to go with a “seal deck” off the bottom of the cyclone. Maintain a dP across the vapor space of the outer can. Another of our units is trying this. Have not had the Reactor open to see how it is doing.
