Relining of 100 Bar Water Power Pressure Pipes with CF/EP-Matrix Composites ? A Case Study
Sprache des Vortragstitels:
3rd World Congress on Civil, Structural, and Environmental Engineering (CSEE?18), Budapest, Hungary ? April 8 - 10, 2018
Sprache des Tagungstitel:
Following the permission for reconstruction by the Austrian federal water authority in 2000, the penstock of one of Austria?s largest reservoir hydropower stations, built in the 1940/50ies near Kaprun (Salzburg) and operated by VERBUND Hydro Power GmbH, was rebuilt with modern grade high-pressure steel pipes. However, for economic and technical reasons it was decided to refurbish the final penstock pipe sections just prior to the turbines when entering the power house (i.e. the ?turbine distribution penstock?), with a nominal pressure rating of 100 bar, via relining the inner surface of the original steel pipes with a specifically developed carbon fiber/epoxy matrix (CF/EP) composite prepreg. In this manner, a high-strength inner CF/EP composite pipe shell was built as self-supporting construction. Based on an extensive experimental program for material qualification incl. issues related to CF/EP prepreg production, handling and deployment and aspects of structural performance, permission by the water authority to implement the CF/EP relining was obtained in March 2003. The reconstructed power conduit of the Kaprun main scheme was put in operation in June 2004. The paper provides an overview of the material development, qualification and quality assurance work that led to applying this novel and worldwide unique CF/EP relining technique for refurbishing extreme high-pressure pipes.