The tube turbine power range is from 20 to 700 kW. Units have a
direct drive configuration where the turbine and the generator are
on the same shaft having common bearings and seals.
The tube turbine-generator configuration is applicable
when there is a penstock feeding water to the power plant. Several
units can be placed after a bifurcation or an unit for each separate
Closing device is typically a butterfly valve. It
is normally opened with hydraulic power pack and closed with dead
weight. A flexible joint is required between valve and turbine to
allow installation and removal of the unit.
The installation angle between horizontal and vertical
may be chosen freely to simplify the power plant design. The space
requirement for the turbine unit is short and no separate installation
beds are required. Turbine unit is bolted on the draft tube flange
and supported on the other end with its own legs.