Geiger® 316b Screens
The 316(b) rule of the Environmental Protection Agency (EPA) forces US plant owners to refurbish their water intakes with more fish friendly screening technologies. Geiger can offer solutions for best possible fish protection in compliance with EPA 316(b). Offshore / deep water intakes equipped with Johnson® Passive Screens ensure fine screening with least disturbance of aquatic life. Open channel water intakes equipped with Geiger MultiDisc® fine screens provide gentle uplift and return of the fish from the intake channel back to their natural water body.
Johnson® Offshore Intake Systems
- Passive intake screens are slotted and cylindrical shaped without any moving parts
- Design slot velocity should not exceed 0.5 feet per second (0.15 m/s) to minimize entrainment
- Unique screen design ensures very low and homogeneous velocity distribution as well as minimized clogging risk
- Suction effects are avoided so there is virtually no influence on aquatic life.
Increased intake capacity up to 40% thanks to newly developed Max-FlowTM Passive Intake Screen
- This advanced type of travelling screens is certified as “best technology available” to minimize impingement and enhance survival rates of aquatic life.
- Specially designed fish buckets on each screen panel ensure gentle uplift and discharge of the fish back to their natural water body
- Separate handling of fish return and screening discharge possible; low pressure spray system for fish return, high pressure spray system for best cleaning performance
- Screen design features significant advantages over conventional travelling screens such as zero carry-over risk, compact and fast installation, reduced maintenance demand
Suitable for the following markets
The final Environmental Protection Agency (EPA) 316(b) rule was signed with the goal of protecting aquatic life in US lakes and rivers. It has direct impact on more than 1,000 existing power/industrial plants mainly used for cooling purposes with raw water extraction above 2 MGD (315 m³/h). Furthermore, renewing an NPDES (National Pollutant Discharge Elimination System) permit requires 316(b) compliance.
Compared to cost-intensive measures like intake relocation or closed cooling cycle systems, existing facilities can rather reach compliance with EPA 316(b) by improving their water intake via one of the above presented solutions.
Our Johnson passive screens are installed submerged and are connected to an intake pipe and/or pump chamber directly. They allow inflow of clean raw water only; all matter bigger than the specified slot size (typically around 3 mm) stays out in the water source. The screens are connected to an automatic flush system with compressed air to avoid any accumulation of deposits around the screen.
The Geiger MultiDisc® travelling screen is an innovative type of through-flow band screen with side-turn rotation pattern. Typical mesh sizes range from 2 mm to 10 mm. Each screen panel is equipped with specially designed fish buckets, which collect the fish from the channel and discharge them with gentle spray water to a fish return trough. Due to its advanced design, our MultiDisc® screen is capable to reduce civil structure size, head loss, installation time and maintenance efforts; carry-over of debris from raw water to clean water side is physically not possible.
In addition to the Johnson® passive screen and Geiger MultiDisc® screen solutions, also our traditional Geiger® center-flow band screens can be upgraded with special fish protection measures such as adequate collection and return systems according to clients’ project requirements.