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Trenchless Technology utilizes corrosion-resistant Flowtite™ GRP pipe for new sanitary sewers in Berlin Combining the brute strength of reinforced concrete with the corrosion-resistance and excellent flow factors of GRP pipe, the composite pipe for this project incorporates an outer, load-bearing wall of reinforced concrete and an inner pipe of GRP. The GRP product selected was Flowtite? pipe from Owens Corning Eternit Rohe (OCER). Using a jacking system to install the composite pipe, the contractor will install 557.5 meters of DN1400, 40 meters of DN1600 and 196 meters of DN2000 pipe. All sections of Flowtite pipe are SN5000 and pressure class PN10. The composite jacking pipe used on this project is actually a pressure jacking pipe as well. The inner Flowtite pipe, PN10 pipe with a 10 bar pressure rating in this case, could just as well have been PN16 or even higher. And the pipe is designed to operate at the pressure rating without benefit from the concrete. Even if the concrete outer wall had been cracked during the jacking process, the inner Flowtite pipe would still provide leak free, corrosion resistant containment to the effluent.