In November 2018, the main pipeline project (Phase II) of the underground comprehensive utility corridor in Pingtan City, Fujian Province was successfully completed.

This project involved a complex pipeline network within the utility corridor. Steel pipes were used for the transportation of drinking water and reclaimed water, while PE pipes were used for sewage transmission. The drinking water pipeline system included multiple pipe sizes, including 630 × 10 mm, 820 × 12 mm, 914 × 14 mm, 1220 × 22 mm, 426 × 8 mm, and 325 × 6 mm.

The total pipeline length reached 28.6 kilometers, with a total of 7,017 weld joints, demonstrating the large scale and technical complexity of the project.

As an important urban infrastructure development, the Pingtan underground utility corridor project placed high demands on pipeline construction quality, operational safety, and long-term corrosion protection performance. The successful completion of this project further highlighted the application value and reliability of pipeline equipment and anti-corrosion solutions in large-scale municipal engineering.

This project serves as another strong example of advanced pipeline construction technology supporting modern urban infrastructure and improving the overall efficiency and sustainability of underground utility systems.