Johnson Passive Intake Systems
The JOHNSON Screens® high capacity passive intake screens are constructed using non-plugging Vee-Wire® with a patented internal dual flow modifier that creates a nearly uniform low velocity flow through the entire screen surface. This significantly reduces impingement and entrainment of debris while protecting aquatic life.
JOHNSON passive intake screens have no moving parts that could break down or wear out. This minimizes the need for replacement parts and costly repairs. The controlled through-slot velocity of the screen, coupled with the specially matched Hydroburst™ air backwash, keeps the system clean and operating.
JOHNSON passive screens are usually designed to meet regulatory requirements for a maximum slot velocity of 0.15 m/s (0.49 ft./s) which is the maximum velocity at which a juvenile fish can turn around, swim away and not be impinged onto a passive screen. This, combined with a typical slot width range of 1 to 10 mm (0.04 to 0.4 in.) will determine the screen sizing. The large open area and low velocities result in a very low headloss and in an even flow, to avoid the suction of particles through the slots. By applying inhouse CFD/FEA- modeling we are able to optimize the design to allow optimal flow conditions, flowing evenly into the patented flow modifier. Our Z-Alloy special material minimizes mussel growth.
Phone (USA): +1 631 839 1297