FishSafe™ RHT runners can be designed for most turbine configurations operating at head up to 40 m (130 ft), without limits on turbine diameter.
Typical turbine configurations include vertical or horizontal axis, axial or radial inflow, and straight or elbow draft tubes.
RHT runners can be coupled to any common power takeoff including direct drive synchronous or permanent magnet generators with fixed or variable speed operation.
Natel FishSafe™ RHTs can be designed as runner-only or turbine-only replacements for equipment at sites with up to 40 m (130 ft) head, allowing plant owners and operators to modernize their equipment without significant civil cost.
Natel rigorously tests RHT performance at our in-house closed-loop hydraulic test facility. We use world-class instrumentation to measure flow, pressure, torque, and speed in scale-model turbine tests. Performance tests are conducted to the American Society of Mechanical Engineers PTC-18 standard.
The same principles that guide the fish safety of RHT designs also reduce blade erosion. Tests following the IEC Standard 62364 showed that the unique blade shape that characterizes RHT designs demonstrated high resistance to abrasion. The testing found that the thickness of RHT blades produced a stagnation effect on sediment slurry while the blade sweep also decreased the contact velocity of sediment impacting the runner. The outcome of these effects resulted in six times less material loss on an RHT-style blade sample as compared to a conventional propeller blade.