It features a three-layer composite structure of "carbon steel base + polymer reinforcement layer + corrosion-resistant inner liner," tightly bonded through a specialized adhesion process. This design combines the pressure resistance of metal with the fatigue resistance and aging resistance of polymers, resulting in a lighter weight and easier installation. It is suitable for applications such as shallow oil and gas field extraction, municipal gas supply, and low-temperature medium transportation, and meets the requirements for lightweight, heat-insulated, and insulated above-ground gathering and transmission pipelines.
| Product Quality Standards | Meets API 5LD or DNVGL-ST-F101 standards and polymer product performance requirements |
| Radial Stability Resistance | Not less than pipeline design operating pressure or ≥20 MPa; suitable for composite pipes with thin liners |
| Bending Resistance | Fatigue-resistant under pipeline vibration; after full-pipe bending at R = 40D, liner remains stable and the polymer-reinforced layer shows no cracking or delamination; supports offshore reel-lay installation |
| Operating Temperature | Long-term operating temperature: –40°C to 120°C with cyclic thermal loading; short-term external coating temperature resistance ≥260°C |
