Wedge Wire Scallops - Reactor Internals Wedge wire scallops are important components of reactor internals. The scallops are manufactured from Johnson filters and have a fan-shaped cross-section, hence their name. Wedge wire scallops are positioned against the reactor wall through expander rings. The top of the scallops is sealed and https://www.steellong.com/products/wedge-wire-scallops-reactor-internals