District heating pipeline networks are a vital part of urban energy infrastructure. They play an important role in protecting people's livelihoods, improving living environments, and supporting high-quality urban development. The China Mainline District Heating Pipeline Project aims to create a safe, efficient, stable, and long-life heat transmission corridor, bringing lasting reliability to the city's heating system through modern pipeline construction.
The project uses directly buried polyurethane pre-insulated pipes to transport hot water. The supply pipeline has a diameter of 1,680 mm, while the return pipeline measures 1,560 mm, and the maximum hot-water transmission temperature reaches 150°C. This large-diameter, high-temperature design demonstrates the scale and capacity of the project while placing demanding requirements on insulation performance, joint sealing, and long-term operational safety.
At every pipe joint, electrofusion sleeves are combined with heat-shrink tapes to form a multi-layer sealing and protection system. This solution further improves sealing performance, durability, and corrosion resistance, laying a solid foundation for the safe and stable long-term operation of the network. Designed for a service life of at least 30 years, the entire pipeline system safeguards the city's heating lifeline with quality built to stand the test of time.
Extending beneath the ground, these heating pipelines connect more than heat sources and the city—they connect thousands of households with the promise of a warm home. As construction continues, reliable heat energy will travel through the main network to communities across the city, providing dependable heating for residents and adding warmth and strength to urban development.
From a single pipe to a citywide heating network, and from every joint to an entire public-service project, each construction step carries responsibility and every technical standard protects long-term safety. We will continue to apply professional expertise, rigorous standards, and a strong sense of responsibility to build lasting, high-quality projects—bringing safe, efficient, and dependable warmth to thousands of households and supporting a better life.