PE100-RC Pipes with Orange Inner Layer for Hong Kong Municipal Drainage Project
Project Location: Hong Kong SAR / Municipal Drainage Infrastructure
Products Applied: DN1200mm & DN710mm, SDR17 PN10 Double-Layer PE100-RC Pipe (Black Outer / Orange Inner)
Heavy-duty dual-layer PE100-RC wastewater piping engineered by DEF PIPELINE using BorSafe™ HE3490-LS-H resin for Hong Kong drainage renewal, featuring an orange inspection lining, chemical resistance to disinfectants, and trenchless installation capability.
Project Background: Demands of High-Density Urban Wastewater Renewal
Municipal drainage and sewage pipeline rehabilitation across the Hong Kong Special Administrative Region represents one of the world’s most demanding urban civil engineering environments. The regional wastewater chemistry carries heavy concentrations of chemical disinfectants (particularly hypochlorite and related oxidizing agents), imposing exceptionally strict corrosion resistance benchmarks on piping infrastructure.
Furthermore, due to Hong Kong’s extremely congested subsurface utility corridors and heavy street traffic, the project authority prioritized trenchless pipe rehabilitation technologies (such as pipe bursting and slip lining). This demanded piping with superior resistance against external rock scratches and point loading:
- Severe Chemical Disinfectant Attack: Long-term resistance against high-concentration hypochlorite solutions without surface micro-cracking or embrittlement.
- Resistance to Slow Crack Growth (SCG): Exceptional crack arrest performance under continuous point loading, essential for sandless trenching and trenchless insertion.
- Rapid Crack Propagation (RCP) Immunity: Critical safety margins to prevent catastrophic crack running under high dynamic wastewater pressures.
- High-Visibility Internal Inspection: A high-contrast internal wall color to facilitate robotic Closed-Circuit Television (CCTV) optical monitoring.
- Subtropical Durability: Tested resilience to Hong Kong’s hot, humid maritime climate with a design life strictly exceeding 50 years.
DEF PIPELINE Dual-Layer PE100-RC Engineered Solution
To satisfy the stringent engineering and public safety criteria of Hong Kong municipal authorities, Henan DEF Pipeline Technology Co., Ltd. developed and manufactured specialized dual-layer co-extruded PE-RC pipes:
Certified BorSafe™ HE3490-LS-H Resin
Manufactured strictly using 100% prime virgin BorSafe™ HE3490-LS-H PE100-RC polymer. Certified under European NF114 standards, this advanced resin provides extraordinary chemical corrosion resistance, easily withstanding hypochlorite disinfectants and aggressive municipal effluents over multi-decade cycles.
High-Visibility Orange CCTV Lining
Engineered with a co-extruded bright orange inner layer. The high-luminosity orange background dramatically improves illumination contrast for municipal CCTV crawler inspection robots, allowing engineers to instantly detect any internal silt accumulation, abrasion patterns, or structural changes during scheduled audits.
Trenchless Installation & Point-Load Security
The PE100-RC formulation delivers industry-leading Slow Crack Growth (SCG) resistance exceeding thousands of hours under Notch Pipe Testing (ISO 13479). This enabled successful trenchless pulling through aged conduits without fear of surface gouges initiating catastrophic cracks, minimizing road closures.
DN1200 & DN710 Large-Scale Extrusion
Produced on DEF’s heavy-duty automated vacuum extrusion lines. Tight dimensional tolerance control across both DN1200mm and DN710mm SDR17 profiles ensured perfect end-to-end alignment during butt fusion welding, achieving a 100% monolithic, zero-leakage pipeline network.
Engineering Benchmark & Regional Significance
“The successful deployment of DEF Pipeline’s BorSafe™ PE100-RC dual-layer pipes in the Hong Kong municipal drainage renewal project demonstrates comprehensive technical excellence in ultra-dense urban construction. From chemical corrosion immunity to the innovative orange CCTV inspection lining, every performance parameter met the highest civil engineering standards. This project serves as an exemplary model for high-reliability municipal wastewater infrastructure across Asian metropolitan centers.”
