Three siphons under the Rhine in Koblenz

When installing new supply lines for drinking water and gas in Koblenz, Energieversorgung Mittelrhein AG opted for siphon lines under the Rhine. The SLM® 3.0 protective layer pipe system was pulled in using the HDD flushing drilling method.

During the drilling work, the pipe string to be pulled in was pre-welded using the butt fusion method. The SLM® 3.0 protective layer pipe system for damage-free installation can be welded in accordance with DVS without cutting back the jacket. Due to space constraints, one pipe string had to be introduced into the bore channel in a 270° arc with a radius of approx. 30 m. Such tight bending radii are only possible thanks to the high flexibility of the PE material.

After completion of the work, all pressure tests were carried out successfully. Thanks to excellent construction planning and the exceptionally good cooperation of all companies involved in the project, the targeted schedule and budget could be met.