The scallops assembly functions as the outer screening unit in radial flow systems. These components are positioned parallel to the vessel wall, utilizing it for structural support while defining the outer boundary of the catalyst bed. Designed for both flow distribution and collection, the system operates effectively in both inward and outward flow configurations.
Installed through the vessel's top manway, scallops are mounted on a support ring affixed to the shell wall. These hollow conduits are arranged circumferentially along the inner wall surface, with each unit processing axial flow within its specific cross-sectional capacity. The combined flow handling capability equals the sum of individual scallop capacities. For high-temperature applications, refractory lining is often applied to the vessel shell to prevent hotspot formation. The cover deck ensures proper sealing between the scallops and inner screen components.
Key Features & Benefits
Enables uniform radial flow distribution
Reduces vessel shell thermal stress
Accommodates axial thermal expansion
Supports bidirectional flow operation
Simplifies installation via standard access openings
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