Installation manual

4.7.8. Pipe thrust blocks

On larger hydro schemes using rigid pipes,

thrust pads and anchor blocks may be

required to prevent movement of the pipe

work. On these larger hydro schemes

professional engineering advice must be

engaged to calculate the supports needed.

4.8. Intake design and placement

The intake for a PLT or TRG turbine should be positioned at the base of a small set of rapids

typically no more than 300-500mm high (to allow room for a sloping intake screen as shown

below). Water flows over the top of the screen falling into the chamber below that feeds the

supply line. Leaves and twigs are washed away with surplus water preventing the intake

from blocking.

Intakes often need to be made to suit each site. The examples below illustrate different ways

to do the same job. The picture of the angled guides and screen is the recommended way to

make a good strong maintenance free intake screen. You must ensure you securely attach

the intake screen to the riverbed by driving galvanized stakes into the ground or attaching to

large boulders with brackets, bolts and cement.

Angled screen

Flat screen in road culvert

Stainless steel perforated tube

Perforated galvanized cable tray intake