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starline® Process
The starline® process is a rehabilitation method we developed for the permanent, trenchless restoration of pressure pipes weakened by aging, using fabric or pressure hose relining. Our efficient technologies are available as an alternative to open-cut construction for virtually all projects in the gas, water, wastewater, and industrial sectors.
In the starline® process, an adhesive-filled, seamless, round-woven, plastic-coated fabric hose or a glass-fiber-reinforced liner is inverted into the weakened or fracture-prone old pipeline using positive pressure. This preserves the hydraulic pipe cross-section and permanently, quickly, and efficiently restores operational safety while maintaining the existing structural integrity.
Trenchless and Powerful – Innovative Solutions for Modern Pipe Rehabilitation
The renewal of pressure pipelines using open-cut construction methods is increasingly reaching its limits, particularly in urban areas, as it involves significant emissions, traffic disruptions, and noise, and requires compliance with extensive environmental regulations. But there is also a trenchless alternative. KARL WEISS Technologies GmbH is rising to these challenges and offers proprietary, patented trenchless methods for the replacement and rehabilitation of pressure pipelines.
With the certified hydros® process group for the trenchless replacement of pressure pipelines in the range from DN 50 to DN 300 (400) and the starline® methods for in-line rehabilitation of gas, drinking water, and wastewater pressure pipelines with diameters ranging from DN 20 to DN 1200 and operating pressures up to 30 bar, we have been successfully implementing trenchless alternatives and methods for more than 30 years.
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starline® Process
The starline® process is a rehabilitation method we developed for the permanent, trenchless restoration of pressure pipes weakened by aging, using fabric or pressure hose relining. Our efficient technologies are available as an alternative to open-cut construction for virtually all projects in the gas, water, wastewater, and industrial sectors.
In the starline® process, an adhesive-filled, seamless, round-woven, plastic-coated fabric hose or a glass-fiber-reinforced liner is inverted into the weakened or fracture-prone old pipeline using positive pressure. This preserves the hydraulic pipe cross-section and permanently, quickly, and efficiently restores operational safety while maintaining the existing structural integrity.
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hydros® Method
The hydros® process was developed by KARL WEISS Technologies GmbH for the fast and cost-effective trenchless replacement of pressure pipelines (service and supply lines). Unlike other rehabilitation methods, the hydros® process completely removes the brittle old pipe material from the pipeline zone and the soil.
The name hydros® stands for “hydraulic pipe pulling and splitting method.” To replace the pipe, the new pipe string is attached to the end of the old pipeline using an adapter. Using an extremely quiet (<, 55 dB(A)) and vibration-free hydraulic pulling device, a new pipe made of any material is pulled into the ground at the same time that the old pipes are being extruded.
Pursue
The company KARL WEISS Technologies is active in the field of trenchless construction methods for pipeline construction as well as in the execution of infrastructure services in civil engineering as well as in classic sewer and pipeline construction.
In addition to project management – including the largest construction projects in civil engineering and urban pipeline construction – we plan and finance construction projects and develop new trenchless technologies in sewer and pressure pipeline construction.

