Product Overview
Explore our core polyurethane insulation solutions for industrial and project applications.
Prefabricated Overhead Steam Insulated Pipe is an advanced insulation pipeline system designed for the transportation of superheated steam and saturated steam.
It can be installed in various above-ground applications and is especially suitable for long-distance district heating transmission networks.
With a multi-layer insulation structure, factory prefabrication process, and modular on-site installation method, the system offers excellent long-term structural stability, high mechanical strength, fast installation, superior thermal insulation performance, and maintenance-free operation throughout its service life.
It enables heating networks to achieve higher energy efficiency, longer transmission distances, and wider coverage.
Technical Parameters
| Item | Specification |
| Transport Medium | Superheated Steam / Saturated Steam |
| Design Pressure | P ≤ 2.5 MPa |
| Design Temperature | T ≤ 350°C |
| Application Area | Above-ground installation areas, suitable for long-distance heating transmission networks |
| Applicable Standard | T/CDHA 2-2019 |
| Service Life | Over 25 years |
Structure
A multi-layer structure designed for reliable steam transmission, efficient insulation, and long-term outdoor durability.
Service Steel Pipe
Manufactured from seamless steel pipe or spiral welded steel pipe according to project requirements.
Thermal Insulation Layer
Built with high-performance insulation materials to reduce heat loss and improve energy efficiency.
Outer Protective Layer
Designed to protect the insulation system and improve weather resistance in above-ground installations.
Advantages Over Traditional On-Site Insulation
Prefabricated above-ground insulated steam pipes are manufactured under controlled factory conditions, reducing on-site installation work, improving construction efficiency, and significantly shortening the overall project schedule.
For a 1 km above-ground pipeline, traditional methods require 1,000 m of on-site insulation. In comparison, prefabricated insulated pipes require only about 50 m of on-site insulation—covering approximately 100 pipe joints—greatly accelerating project completion.
Traditional insulated pipes require on-site insulation installation, resulting in complex construction and limited quality control.
Factory prefabrication ensures quality control throughout the entire production process.
Traditional insulated pipes use outer jackets assembled from color-coated steel or sheet metal. Gaps at the seams may allow air leakage and water ingress.
Prefabricated insulated pipes provide excellent waterproofing and a durable, attractive appearance.
Traditional insulation-wool and sheet-metal wrapping is prone to deformation.
The rigid base layer provides excellent resistance to deformation.
Traditional insulated pipe supports use thermal insulation blocks with relatively high thermal conductivity. Transverse gaps at the supports also allow heat to escape, resulting in additional heat loss.
The supports are installed outside the insulation layer, eliminating thermal bridges.
Prefabricated Above-Ground Insulated Steam Pipe Specifications
| Nominal Diameter | Service Steel Pipe OD × WT (mm) | Outer Protective Layer OD × WT (mm) | Damping Layer (mm) | Support Layer (mm) | Polymer Layer (mm) | Weight (kg/m) | Product Length (m) |
| DN100 | Φ108 × 4 | Φ321 × 0.5 | 6 | 80 | 20 | 10 | 12 |
| DN125 | Φ133 × 4.5 | Φ346 × 0.5 | 6 | 80 | 20 | 14 | 12 |
| DN150 | Φ159 × 5 | Φ400 × 0.5 | 6 | 90 | 25 | 19 | 12 |
| DN200 | Φ219 × 6 | Φ502 × 0.5 | 6 | 110 | 25 | 31 | 12 |
| DN250 | Φ273 × 7 | Φ567 × 0.5 | 10 | 115 | 25 | 46 | 12 |
| DN300 | Φ325 × 8 | Φ636 × 0.5 | 10 | 120 | 25 | 63 | 12 |
| DN350 | Φ377 × 8 | Φ738 × 0.8 | 10 | 140 | 30 | 73 | 12 |
| DN400 | Φ426 × 10 | Φ788 × 0.8 | 10 | 140 | 30 | 103 | 12 |
| DN450 | Φ478 × 10 | Φ862 × 0.8 | 10 | 150 | 30 | 115 | 12 |
| DN500 | Φ529 × 10 | Φ911 × 0.8 | 10 | 150 | 30 | 128 | 12 |
| DN600 | Φ630 × 10 | Φ1032 × 1.0 | 10 | 160 | 30 | 153 | 12 |
| DN700 | Φ720 × 10 | Φ1152 × 1.0 | 10 | 170 | 35 | 175 | 12 |
| DN800 | Φ820 × 10 | Φ1282 × 1.0 | 10 | 180 | 40 | 200 | 12 |
| DN900 | Φ920 × 10 | Φ1197 × 1.0 | 10 | 190 | 45 | 224 | 12 |
Not Sure Which Product Fits Your Project?
Send us your pipe diameter, operating temperature, insulation thickness, density requirement, support type, and drawings. Our team will help recommend the right insulation product and quotation plan.
