Johnson screen nozzle manufactured by wrapping a shaped wire around an internal array of longitudinal rods.The wire and rod, generally made from carbon or stainless steel are joined by resistance welding. Screen sections are usually twenty feet long. Commonly referred to as continuous slot or wire wrap screen, this product was originally developed to overcome problems associated with cable tool wells drilled in fine grained.

Advantage of Vessel Internals Johnson Screen Nozzles for Filtration

-- High strength;
-- Good resistance to abrasion and corrosion;
-- High rigidity;
-- Good in filtration and fluidity;
-- Flat panel surface;
-- Fairly well precision and roundness;
-- Long work time.
-- Easy to clean and back wash;
-- Uniform gap. 

Application of Vessel Internals Johnson Screen Nozzles for Filtration

Above mentioned designs are used widely in down-flow reactors for liquid/solid or gas/solid separation.
The liquid or gas can flow through the nozzles while the solids are retained in the vessel by the nozzles.