Daoyunai Energy Saving Technology Limited Cases

Case Study: Trenchless UV Curing Rehabilitation for Large-Diameter Underground Drainage Pipe in Wenzhou, Zhejiang Project Overview:In March 2025, a challenging trenchless sewer rehabilitation project was successfully completed in Wenzhou, Zhejiang, involving the UV CIPP lining of a DN1800 underground drainage pipe. The project was executed using advanced UV curing technology, ensuring minimal disruption to the surrounding area while restoring the structural integrity of the large-diameter sewer pipeline. Key Challenges: Extra-Large Pipe Diameter (DN1800): The massive 1.8-meter sewer pipe required specialized trenchless pipe lining techniques. Heavy Material (Approx. 10 Tons): Transporting and installing the UV-cured CIPP liner demanded precision due to its weight. Buried Depth (3 Meters): The moderate burial depth required careful handling to avoid surface disturbance. Non-Disruptive Construction: As an urban drainage repair project, minimizing road closures and environmental impact was critical. Solution: UV CIPP Lining by Daoyunai Energy-Saving TechnologyThe rehabilitation used a high-strength UV-cured liner manufactured by Daoyunai Energy-Saving Technology (Suqian) Co., Ltd., a leader in CIPP pipe repair materials. The 90-meter-long liner was carefully inserted and then cured in place using UV light technology, creating a seamless, corrosion-resistant new pipe within the old one. Execution Process: Pipe Inspection & Cleaning: Prior to lining, the sewer pipe was inspected and cleaned to ensure optimal curing. Liner Installation: The 10-ton CIPP liner was pulled into the DN1800 pipe using a winch system and crane. UV Curing Process: A UV light train was deployed to harden the resin, forming a durable, jointless pipe. Quality Testing: Post-curing, the new pipe was inspected via CCTV sewer camera to confirm a perfect fit. Results: Fully Restored Pipeline: The trenchless pipe repair extended the lifespan of the municipal drainage system without excavation. Cost & Time Efficient: Compared to traditional dig-and-replace methods, UV CIPP lining saved both time and budget. Zero Surface Damage: The no-dig sewer repair prevented road closures and traffic disruptions. Why This Method? Best for Large Pipes: UV-cured CIPP is ideal for big-diameter sewer rehabilitation (DN1200+). Long-Term Durability: The new liner resists corrosion, roots, and cracks, reducing future maintenance. Eco-Friendly: No excavation means lower carbon footprint—ideal for sustainable urban drainage solutions. Conclusion:This DN1800 sewer pipe rehabilitation in Wenzhou demonstrates the effectiveness of trenchless UV curing technology for large-scale municipal drainage repairs. By partnering with Daoyunai Energy-Saving Technology, the project achieved a fast, durable, and non-disruptive solution, setting a benchmark for underground pipe rehabilitation in China.

Successful UV Liner Installation: Mini LED CIPP Solves Small Sewer Challenges Efficient Trenchless Repair for DN200 Sewers with Daoyunai’s Mini LED UV CIPP Equipment In April 2025, Daoyunai Energy Saving Technology Suqian Company successfully completed a UV liner installation in Suzhou, demonstrating the effectiveness of Mini LED UV CIPP technology for small-diameter sewer rehabilitation (DN100-DN250). This project highlights how trenchless UV curing can overcome challenges in tight spaces where traditional methods fail. Project Overview Location: Suzhou, China Pipe Diameter: DN200 Section Lengths: 20m, 30m, 40m Installation Period: March 30 – April 20, 2025 Key Technology: UV curing with Daoyunai’s fiberglass resin liner Equipment Used: Mini LED UV CIPP System (DN100-DN250 compatible) Challenges & Solutions The sewer pipes in this project were:✔ Small-diameter (DN200) with multiple bends✔ Short section lengths (20m-40m)✔ Located in confined spaces (riverbanks, villages)✔ Inaccessible to large machinery Traditional excavation or steam-cured CIPP would have been costly, disruptive, or impossible. Instead, Daoyunai’s Mini LED UV CIPP equipment provided:✅ Compact & portable design – Easy transport and setup in tight areas✅ UV-LED cold curing – No heat risk, energy-efficient operation✅ Fast installation – Reduced downtime compared to steam curing✅ High-quality resin liner – Durable, seamless pipe renewal Why UV CIPP Was the Best Choice No Excavation Needed – Avoided road closures and property damage. Precision Curing – UV-LED technology ensured even hardening without wrinkles. Eco-Friendly – Low emissions, no wastewater discharge vs. traditional methods. Long-Term Performance – The glass fiber resin liner resists corrosion and cracks. Customer Satisfaction The asset owners and contractors praised the results: Smooth, jointless pipe interior with no leaks Minimal disruption to surrounding areas Cost savings vs. dig-and-replace methods Daoyunai’s Mini LED UV CIPP System: Ideal for Small-Diameter Sewers This Suzhou case proves that UV trenchless repair is ideal for: Municipal sewer networks (DN100-DN250) Villages, historic areas, and narrow urban spaces Emergency repairs requiring fast turnaround Technical Advantages of Daoyunai’s Equipment ✔ Lightweight & portable – Fits where large rigs can’t✔ UV-LED efficiency – Lower power demand vs. mercury lamps✔ Real-time monitoring – Ensures proper curing✔ Customizable liners – For bends and varying pipe lengths Conclusion: The Future of Small-Pipe Rehabilitation is UV CIPP This Suzhou UV liner installation showcases how Daoyunai’s Mini LED UV CIPP technology delivers faster, cleaner, and more sustainable sewer repairs in constrained environments. Need a trenchless solution for small-diameter pipes?