Wall thickness：5mm

Length：46m

Application：Sewage pipe

Project Introduction：Located in the city center, the pipe was buried at a depth of 2.7 meters and was surrounded by dense vehicular and pedestrian traffic. The original pipe was a concrete sewage pipe, which exhibited wrinkling issues in its mid-section.

Construction Challenge：

1. This was the  first ultraviolet curing rehabilitation completed at an altitude of 3,000 meters. Due to its high altitude, which was characterized by low air pressure and low oxygen content, it had extremely high requirements for the stability of UV curing system(equipment), posing great challenges to the construction.

2. The huge temperature difference between morning and evening had extremely high requirements for the stability of UV-CIPP liners. The liners needed to be able to adapt to extreme temperature changes, resist the special geographical environment, and provide long-lasting protection for the pipes.

3. The thin oxygen made it difficult for construction workers to breathe, thus prolonging the construction time.