Passive Water Intake Screens

The flow passes through its tapered bar structure at a low, uniform velocity and this unique design reduces the effects of blinding and increases the duration of operation between cleaning cycles. 

• Passive screens provide a lower cost alternative to traditional travelling screens for smaller intakes 
• Passive screens are “fish friendly” and minimise damage to aquatic life.
• Debris remains in the water, thus handling and disposal of debris  onshore is avoided
• Passive screens result in a simplified intake and pump station design
• In high debris environments, debris removal is achieved by an air-burst system which dislodges the debris accumulated on the screen surface by a rapid release of air through manifold of nozzles inside the screen body

Intake screens can be subject to fouling or plugging by aquatic growth, including zebra mussels and, by constructing the passive screen from copper nickel alloy this can be minimized. Additionally, a chemical injection system is available to inject an approved, patented bio-dispersant into the screen body to further reduce marine growth.

• Capacity up to 5m3/sec per unit (depending on slot size)
• Slot sizes vary from 1 – 5 mm, 3mm being typical
• Available  in either Drum or T-type

• Reduces fish kills and prevents fish entrainment
• Prevents plant shutdown
• Finer openings with larger wire or bar sizes for longer weirs
• Bio-fouling stays off the screen

• Greater flexibility in design, forming and shaping
• Reduced civil work requirement lowers costs
• Simple intake and pump station design
• Low maintenance costs, and reduced risk of plant failure or fatigue
• No debris handling/disposal issues