Advantages Screw Turbines
The Spaans Babcock Screw Turbine is robust, extremely reliable and has a long life time. The Spaans Babcock Screw Turbine consists of only a few wear parts. The low rotational frequency results in low wear and very low maintenance costs. A lifetime exceeding 30 years is not an exception, whereas the efficiency stays constant over the years.
+ Low Head
The Screw Turbine is especially suitable for low heads, already starting from 1 m. This may go up to 12 m for a single stage, or 24 m for a two stage installation.
The efficiency curve shows a flat and high efficiency over a wide range of the capacity. Varying heads and capacity hardly have any effect on the efficiency.
The Screw Turbine does not need any grease pump for lubrication of the bottom bearing. This improves the efficiency and lowers the operational costs.
+ Other turbines
The Screw Turbine has a very high efficiency compared to other types of small turbines.
+ Fish friendly
Several tests have demonstrated the fish friendliness of the Screw Turbine and Screw Pump. The Screw Pump can also be used as a fish ladder by pumping the fish.
+ Free passage
Large solid particles, such as plastic, wood or small stones, can pass the Screw Turbine, without having any effect on the Screw Turbine or its efficiency.
+ Bar screen
For safety reasons, only a simple static bar screen is required upstream of the Screw Tubine. This saves costs, prevents head loss and allows fish to pass.
The Screw Turbine can be designed with variable and fixed speeds. Each system will be designed to match flow patterns and as such optimise revenue.
The power production is up to 500 kW per Screw Turbine and extended by multiple screws easy to >2MW per site.
The Screw Turbine can handle flows from 100 l/sec up to 15 m3/sec per screw turbine.
Multi-Stage and parallel systems are possible. The system will be designed to maximise revenue from higher heads or larger flows than is possible with a single Turbine.
Cleaning of the Screw Turbine is not necessary. The Screw Turbine is self-cleaning. There will be no efficiency loss due to dirt build up.
+ Construction costs
Civil construction costs for the Screw Turbine are generally lower than for other types of turbines. Screw Turbine systems are specifically designed to suit existing civil layouts.
Optimal design of the Turbine and control system helps to minimise or eliminate noise generation.