1. Structural Form
Working pipes: Utilizing new types of working pipes such as PERT, PPR, and PE.
Insulation: Made of rigid polyurethane foam plastic; Leak Alarm Line: During the manufacturing of high-temperature pre-fabricated buried thermal insulation pipes, an alarm line is embedded in the insulation layer adjacent to the steel pipe. In the event of a leak at any point in the pipeline, the alarm line transmits the signal, triggering an alarm on a specialized detection instrument and displaying the exact location and magnitude of the leak, allowing for quick notification to maintenance personnel to address the leaking section and ensure the safe operation of the heating network.
External Sheath: High-density polyethylene or glass fiber reinforced plastic external sheath used.

2. Application Scope
Insulation for liquids and gases with temperatures not exceeding 120°C and pressures not exceeding 1.6 Mpa.

3. Standard of Execution
High-Density Polyethylene (HDPE) Outer Sheath Polyurethane Foam Pre-fabricated Direct Burial Insulation Pipe (GB/T 29047-2012)
High-Density Polyethylene (HDPE) Outer Sheath Polyurethane Foam Pre-fabricated Direct Burial Insulation Pipe (CJ/T 114-2000)
Integral Pre-insulated Pipe System for Underground Hot Water Networks - Insulating Pipes Composed of a Working Steel Pipe, Polyurethane Insulation, and Polyethylene Sheath (EN253-2003).

4. Lifespan
Due to the high-density polyethylene outer sheath of this structure, it boasts excellent waterproofing, moisture-proof, and corrosion-resistant properties. The working pipe and insulation layer are fully protected by the outer sheath, allowing for continuous use under normal operating conditions for up to 30 years.