650 m long penstock pipeline running to a hydro power station in Brescia

The engineers who already knew the advantages of HOBAS CC-GRP due to projects in the past, based their decision on three major requirements: to minimize friction loss (the nominal head was only 10.3 m), to underpass the highway A4 by jacking withstanding also the constant traffic loads and to have a material that is resistant to corrosive substances. HOBAS CC-GRP Pipe Systems with their mirror-like inner pipe surface grant a K-factor below 0.01 which ensures an optimal flow rate. High stiffnesses and compression can be achieved with the production process, namely centrifugal casting. This makes HOBAS CC-GRP gravity as well as pressure pipes suitable for trenchless applications such as jacking and microtunneling. No extra protection that is easily damaged or worn during installation is necessary since HOBAS CC-GRP Pipe Systems are highly corrosion resistant. The penstock consists of a first short section DN 1600 laid in open trench, further 60 m with the same outer diameter run below the highway. A reducer on the other end of the jacking section switches to a 250 m long DN 1500 pipe that finally leads to the power house. Two tees were installed along this section for future access.