Within the station building, the turbine has a fourbladed runner and concrete spiral casing.
2.
Within the station building, the turbine has a five-bladed runner and concrete spiral casing.
3.
Pre-stressed cables passing through the stay vanes anchor the spiral casing and form part of the station foundation.
4.
The station building houses a single alternator and the turbine has a fully embedded spiral casing with water flow controlled via a butterfly type valve.
5.
"' Spiral casing "': The spiral casing around the runner of the turbine is known as the volute casing or scroll case.
6.
"' Spiral casing "': The spiral casing around the runner of the turbine is known as the volute casing or scroll case.
7.
Within the station building, each turbine has a fully embedded spiral casing and water flow is controlled by a spherical rotary main inlet valve and a turbine relief valve designed to prevent spiral casing overpressure.
8.
Within the station building, each turbine has a fully embedded spiral casing and water flow is controlled by a spherical rotary main inlet valve and a turbine relief valve designed to prevent spiral casing overpressure.
9.
Within the station building, each turbine has a semi-embedded spiral casing and water flow is controlled via a spherical rotary inlet valve and a relief valve designed to prevent spiral casing over pressure.
10.
Within the station building, each turbine has a semi-embedded spiral casing and water flow is controlled via a spherical rotary inlet valve and a relief valve designed to prevent spiral casing over pressure.
