Fold and Form: Successful Rehabilitation for a DN300 Steel Pipeline in Shenzhen
This project successfully rehabilitated a DN300 steel pipeline located beneath a bridge in Shenzhen, China.
Project Overview
This project successfully rehabilitated a DN300 steel pipeline located beneath a bridge in Shenzhen, China. The 36-meter pipeline had been in long-term service and was experiencing severe internal scaling that compromised both drinking water quality and supply efficiency. Positioned in a highly sensitive urban environment directly under a bridge structure, traditional open-cut replacement was not feasible due to the significant risks of structural disturbance to the bridge foundation and unavoidable disruption to normal traffic flow. After comprehensive technical evaluation of site constraints, structural requirements, and operational continuity needs, Fold and Form Lining technology was selected as the optimal trenchless rehabilitation solution.
Rehabilitation Process
The Fold and Form Lining technology delivered exceptional efficiency, with the entire 36-meter rehabilitation process—from initial cleaning through final cooling—completed in just 3.5 hours, setting a new benchmark for rapid deployment in constrained urban environments.
Pipeline Internal Inspection: Comprehensive CCTV inspection assessed the pipeline's internal condition, identifying scaling severity, structural defects, and optimal rehabilitation strategy.
Pipeline Cleaning: Thorough mechanical and high-pressure cleaning removed decades of accumulated scaling and debris, preparing an optimal surface for liner adhesion and performance.
Steam Heating and Softening: The Fold and Form thermoplastic liner was precisely heated using steam under controlled pressure, rapidly achieving the ideal flexibility for installation while preserving material integrity.
Pulling into Host Pipe: The softened liner was efficiently pulled through the full 36-meter section, achieving precise positioning even within the tight bridge-under working space.
End Plugging: Both pipeline ends were securely sealed to establish a controlled pressure environment essential for uniform liner expansion.
Secondary Heating and Pressurization: A second controlled heating and pressurization cycle expanded the liner to achieve complete, tight conformity with the host pipe's internal geometry.
Cooling and Formation: Strategic cooling solidified the liner in its final expanded form, creating a seamless, high-performance internal lining system permanently bonded to the host pipe wall.
Flange End Finishing: Precision flange end processing ensured seamless integration with existing pipeline connections, maintaining hydraulic continuity and structural integrity.
Project Results
The DN300 steel pipeline was completely restored to optimal operational condition without any excavation, structural disturbance to the bridge, or interruption to surrounding traffic and utilities. The Fold and Form liner successfully eliminated internal scaling issues, restored full hydraulic capacity, and created a durable, corrosion-resistant internal surface optimized for long-term drinking water service.
What stands out most impressively is the 3.5-hour total execution time for this complex urban rehabilitation—a demonstration of Fold and Form Lining technology's unmatched combination of speed, precision, and reliability. This project proves that even in the most challenging infrastructure environments, advanced trenchless solutions can deliver mission-critical pipeline renewal with minimal downtime and maximum operational continuity, making it the preferred choice for sensitive urban water infrastructure projects worldwide.
Contact Us
Ready to bring this level of efficiency to your pipeline rehabilitation projects? Contact Anyue today for technical consultation, product specifications, and customized trenchless solutions: info@anyuetrenchless.com.