Project Background
As one of the most densely populated cities in the world, Hong Kong’s underground drainage system carries a huge load. Due to the long history of urban development, some of the underground pipes are prone to leakage, blockage or even collapse due to aging, corrosion or tree root intrusion. To ensure the efficient operation of the drainage system and to prevent unexpected incidents, the Hong Kong Drainage Services Department (DSD) has in recent years widely adopted the Closed Circuit Television (CCTV) sewer inspection technology in conjunction with Puhui’s PE100RC (High Density Polyethylene) double co-extruded pipelines for rehabilitation and upgrading.
What is CCTV sewer inspection?
CCTV (Closed-Circuit Television) here refers specifically to pipeline closed-circuit television inspection systems, rather than traditional security monitoring. CCTV works by placing robotic crawlers equipped with high-definition cameras, lighting and sensors inside the pipe, capturing real-time images of the inside of the pipe and transmitting them to a ground console。
Core Advantages of PE100RC Double-layer Co-extruded Pipeline
In the Hong Kong project, in response to the broken old concrete pipes detected by CCTV, the engineering team used PE100RC double-layer co-extruded pipes produced by Puhui Industry as the lining repair material. Its advantages are mainly reflected in the following aspects:
1. Excellent corrosion resistance and durability
2. High flexibility and deformation resistance
3. Smooth inner wall with excellent hydraulic performance
4. Rapid installation to minimise social impact
5. Environmentally Friendly and Cost Effective
Project Practice and Effectiveness in Hong Kong
During a sewerage rehabilitation project in an area in Kowloon, the engineering team found multiple cracks and leaks in a section of concrete pipe about 800 metres long through CCTV inspection. It was repaired by Puhui Industry’s PE100RC double co-extruded pipe lining:
Improved inspection efficiency: The repaired pipe lining was smooth and unobstructed, the CCTV robot travelled 40% faster and the image clarity met the requirements of 3D modelling;
Enhanced drainage capacity: water flow rate increased by 22%, and the complaint rate of water accumulation in rainy season decreased by 90%;
Remarkable social benefits: the project only occupies the night time hours for construction, and the road surface passes normally during the day, which is highly recognised by the surrounding communities.
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