Insulation structure
Composed of working steel pipe, aluminum silicate drag-reducing layer, microporous calcium silicate insulation layer, stainless steel reinforcing steel belt, aluminum foil reflective layer, polyurethane thermal insulation layer, outer steel pipe, and external anti-corrosion layer.

2. Application Scope
Steam with a conveying medium not exceeding 350°C and a working pressure not exceeding 2.5 MPa.

3. Standard of Execution
"Technical Conditions for Pre-fabricated Direct-Buried Steam Insulation Pipes for Urban Heating (CJ/T200-2004)"
"Technical Code for Pre-fabricated Direct Buried Steam Pipeline for Urban Heating (CJJ104-2005)"

4. Service Life
The outer sheath of this structure is coated with a corrosion-resistant layer, ensuring that the working pipe and insulation are fully protected within the outer sheath. Under normal operating conditions, it can be used continuously for 30 years.