North Walsham

Radius Subterra partnered with Anglian Water to solve leak issues in a hard-to-reach 10” water pipeline in East Anglia. Using their innovative Rolldown & Slipline method, Subterra maximised pipe bore size and minimised environmental impact, achieving a seamless solution where traditional methods failed.

North Walsham Video Case Study

Rolldown & Slipline - North Walsham - Radius Subterra

Challenges Radius Subterra Faced

Limited Access and Environmental Constraints: The 10” PVC pipeline was located in mature woodland in East Anglia, with restricted access due to trees and badger sets, making traditional excavation methods impractical.

Inadequate Traditional Solutions: Conventional slip-lining was not feasible because the reduced bore size of a 225mm PE pipe could not maintain the necessary water flow rate.

The Radius Subterra Solution

Innovative Rolldown Method: Subterra used the Rolldown technique, which involved temporarily reducing the diameter of a 250mm PE100 pipe by 10% to fit into the existing PVC pipeline, then reverting it to its original size as a close-fit liner. This approach maximised the bore, required minimal excavation, and maintained optimal water flow.

Custom Pipe Design: Radius Systems manufactured bespoke 13.5m sections of 250mm SDR21 PE100 pipe, tailored to the project requirements, reducing on-site welding and enhancing installation efficiency.

Benefits

Specialist Expertise

Unique knowledge and experience in advanced pipeline rehabilitation techniques like Rolldown, ensuring precise and effective installations.

Minimised Disruption

Reduced excavation requirements preserve natural landscapes and lower project costs, carbon footprint, and reinstatement needs.

Enhanced Flow and Longevity

Maximised bore size maintains optimal flow rates and pipeline health over time, addressing both immediate and long-term infrastructure needs.

Reliable Quality Assurance

Adherence to ISO standards and robust quality controls ensure high standards in installation, welding, and testing procedures.

Conclusion

Radius Subterra successfully overcame challenging terrain and operational constraints, providing a robust and efficient pipeline rehabilitation solution that minimised environmental impact and maintained critical water flow. The project’s scope expanded from 1200m to 1500m, demonstrating the adaptability of the Rolldown method, even when unexpected obstacles, such as a gas main, were encountered.

Learn about RollDown

Discover RollDown, the ultimate pipeline renovation system. Our method reduces PE pipe diameter by 10%, fitting seamlessly into existing mains while maintaining full pressure ratings and thick walls. Suitable for pipes from 100mm to 500mm, RollDown maximises flow, boosts efficiency, and offers a cost-effective, eco-friendly alternative to open-cut replacements. Elevate your pipeline solutions with RollDown. Click to learn more.

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