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Help CenterSteel Pipe & Tube，Pre-insulated Pipe， GB/T 29047, GB/T 34611, CJ/T 114，DN25 – DN1400
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Thermal Insulation Steel Pipe - Product Detailed Description (Bilingual)
1. Product Introduction
Thermal Insulation Steel Pipe is a prefabricated composite pipeline integrating conveyance, thermal insulation, anti-corrosion and protection. It adopts integrated foaming technology, featuring a pressure-bearing inner layer, a heat-insulating middle layer, and a waterproof outer layer. Widely used in central heating, municipal HVAC, petrochemical, industrial fluid and low-temperature refrigeration projects. It can be directly buried or overhead installed, effectively reducing heat loss and eliminating issues like corrosion, condensation, and cracking. It is a core material for energy-saving and environmental protection pipeline engineering.
2. Core Structure (Three-in-One Integrated Type)
1. Inner Layer: Working Steel Pipe
It uses 20# seamless steel pipe, Q235B straight welded pipe, spiral steel pipe, Q345B low-alloy steel pipe, etc. Custom stainless steel materials are available. The pipe is subjected to Sa2.5 grade shot blasting derusting treatment, featuring high compressive strength and good sealing performance, suitable for conveying high-temperature hot water, steam, oil products, chemical fluids, and other media.
2. Middle Layer: Rigid Polyurethane Foam Insulation Layer
Adopting high-pressure integral foaming technology, it has a closed cell rate of ≥92% and a density of 60–80kg/m³. With a thermal conductivity coefficient ≤ 0.024W/(m·k), it provides excellent thermal insulation, low water absorption, flame retardancy, and sound insulation. It can withstand long-term high and low temperatures ranging from -50℃ to 140℃. High-temperature resistant foam materials can be customized for special working conditions.
3. Outer Layer: Protective Casing
The standard outer casing is made of High-Density Polyethylene (HDPE) pipe, which is anti-aging, wear-resistant, waterproof, and moistureproof. For special working conditions, materials such as Fiberglass Reinforced Plastic (FRP), galvanized steel pipe, or carbon steel outer casing (steel sleeve structure) can be selected to adapt to strong acid and alkali environments, high-temperature steam, and highly corrosive underground geological conditions.
3. Main Product Categories
1. Pre-insulated Directly Buried Polyurethane Thermal Insulation Steel Pipe
A best-selling product with high cost-performance ratio. It is widely used in municipal heating, district heating, central air conditioning water circulation, and features convenient underground construction.
2. Steel Sleeve Steel Thermal Insulation Steel Pipe (for Steam)
Features an inner and outer double steel pipe structure with aluminum foil reflective layer and air insulation layer. It can resist high temperatures up to 350℃, suitable for high-temperature steam and thermal power industrial pipelines.
3. Anti-corrosive Thermal Insulation Steel Pipe with FRP Outer Casing
Made of fiberglass reinforced plastic outer casing, it is acid and alkali resistant and anti-aging. Ideal for chemical engineering and coastal projects with high salt spray corrosion environment.
4. Overhead Special Thermal Insulation Steel Pipe
Equipped with additional anti-sun, rain, and UV protection layers. Suitable for laying in industrial parks, outdoor open areas, and other overhead projects.
4. Core Technical Parameters
• Relevant Standards: GB/T 29047, GB/T 34611, CJ/T 114
• Nominal Diameter: DN25 – DN1400 (Custom large diameter available)
• Insulation Thickness: 30mm – 120mm (Customizable)
• Working Pressure: 1.0MPa – 2.5MPa
• Service Life: ≥30 years for direct burial; ≥25 years for overhead installation
• Connection Methods: Welding, Flange connection, Groove connection
5. Product Advantages
1. High Energy Efficiency: Excellent thermal insulation performance reduces heat loss by more than 75% compared with traditional pipes, significantly saving operation costs.
2. Anti-corrosion & Durable: Multi-layer anti-corrosion design resists soil corrosion and acid/alkali erosion, adapting to complex geology.
3. Efficient Construction: Factory-prepared integrated finished products eliminate on-site secondary insulation, shortening construction periods and reducing labor costs.
4. Safe & Stable: The integrated structure is tightly bonded without peeling off. It is fire-retardant, anti-extrusion, anti-cracking in low temperature, and has excellent sealing performance.
5. High Customization: Materials, diameter, wall thickness, insulation layer thickness, and protection type can be customized according to drawings or working conditions.
6. Scope of Application
• Municipal Engineering: Urban central heating pipe networks, residential heating, urban and rural water heating renovation.
• HVAC: Cold and hot water transmission pipelines for shopping malls, hotels, and industrial parks.
• Energy & Chemical Industry: Petroleum, natural gas, chemical waste liquid, and heat transfer oil pipelines.
• Industrial Parks: High-temperature circulating water, steam pipelines, and low-temperature refrigeration pipelines in factories.
• Special Scenarios: Anti-freezing pipelines in cold regions, coastal anti-corrosion projects, and underground comprehensive pipe galleries.
7. Supporting Services
We can supportingly produce pipe fittings such as insulation elbows, tees, reducers, fixed supports, and steam traps, providing one-stop supporting services for complete pipeline accessories. We also supply complete inspection reports, material certificates, and factory delivery certificates, and support third-party quality inspection to meet international project acceptance standards.
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