Outer baskets are the outer screen components of a radial flow system. Their general shape is extending parallel to the inner vessel wall. Their surface delimits the outer side of the catalyst bed.
They are usually installed inside vertical reactors and distribute or collect the flow.Cover deck is closing the gap between inner screen component and outer baskets. Flow direction can be outwards or inwards.
The outer basket is one single piece equipment that has to be installed over the full vessel cross section. The equipment is self standing on a support ring attached to the vessel shell.As the outer basket is self-standing, it allows wider distance towards the inner vessel surface, therefore, higher flow capacity. The annular gap remains constant whichever direction the flow goes. As being apart from the vessel shell, it has to withstand the full mechanical stress given by the catalyst bed and, in the same way, it is not compressed by the stress transferred from the vessel shell.