WHAT IS FOLD-AND-FORM LINING TECHNOLOGY?
Fold and Form lining technology is an advanced trenchless pipeline repair technology that utilizes the reheating and reshaping properties of thermoplastic polymer materials. Factory-preformed I-shaped or C-shaped liners are softened with steam, pulled into the host pipe, and then expanded through secondary heating and pressurization to tightly adhere to the existing pipe wall. Once cooled, the liner forms a high-strength structural rehabilitation layer.
Fold-and-Form Lining Process
1. Pipeline Inspection
A CCTV camera inspection is first conducted to assess the internal condition and identify issues within the host pipe.
2. Pipeline Pre-treatment
The pipe is thoroughly cleaned to remove debris and blockages, ensuring a clean surface for optimal liner adhesion.
3. Liner Preheating
The PVC liner is softened in a preheating oven to increase its flexibility and prepare it for installation.
4. Liner Pull-in
The heated, folded liner is winched into the host pipe through a manhole or access point without excavation.
5. Plug Installation
Inflatable plugs are installed at both ends of the liner section to create a sealed environment for the next stage.
6. Liner Heating and Pressurization
Pressurized steam is introduced to expand the liner tightly against the host pipe walls, forming a tight, structural "pipe-within-a-pipe".
7. Liner Cooling and Shaping
The liner is cooled using a controlled air-water mixture to set its new shape and achieve initial structural strength.
8. End Flanging Treatment
The liner ends are thermally formed into flanges against the host pipe, creating a seamless and secure connection at the termination points.
9. Rehabilitation Completed
After cooling, the new liner is fully formed, structurally independent, and ready for service.
10. Rehabilitated Pipe Connection
Lateral service connections are precisely reopened using a robotic cutter guided by CCTV, restoring full functionality.
Equpment Features
- Innovative dual heating modes (internal and external) for flexible and efficient pipeline rehabilitation.
- Proprietary internal heating technology delivers 50% faster heating efficiency and 50% lower fuel consumption compared to external heating methods.
- Optimized in-cab equipment integration ensures stable operation and enhanced vehicle safety.
- Certified inspection-exempt steam generator equipped with automatic pressure relief for fail-safe performance.
- Dedicated toolset enables user-friendly operation and maximizes workflow efficiency.
