Home › Forums › CatCracking › FCC Operations › Internal bellows expansion joints inside FCC reactor › RE: Internal bellows expansion joints inside FCC reactor
The VSS disengager expansion joints have been a topic since they were introduced.. Coke build up was a major problem at a rectent turn around were the coke packed the joint and it “dimpled” the internal dome of the regenerator. As a result of this “learning” experience, we no longer recommed internal/external insulation. Also, the area between the bellows and internal liner has to be “cleaned” of coke every turn around. The best solution is to install steam purging between the bellows and the liner. However, this may be too costly and the alternative is to “clean” the bellows every turn around. If you would like to discuss this matter further, please feel free to contatc me.
Dan Edgar, PE
Senior-Flexoncis, Pathway Div