Underground Direct Buried Insulated Steel Pipe are widely used in liquid and gas transmission pipe networks, chemical pipe insulation projects in petroleum, chemical, central heating and heating networks, central air-conditioning ventilation pipes, and municipal engineering.
Underground Direct Buried Insulated Steel Pipe is a direct-buried prefabricated thermal Insulation steel pipe with good thermal insulation performance, safety and reliability, and low construction cost.
Specification
1. The pre-insulated steel pipe coated with high density polyurethane foam can resistant the temperature up to 140°c.
2. With the corrosion resistant HDPE jacket pipe can make the pipe directly buried underground without trench.
3. Different size pipe and pipe fittings can service for different heating and cooling project.
4. The polyurethane foam thickness can be designed from 26.5-83mm or more.
Product Features
Working Steel Pipe
The core layer, which transports the medium (such as hot water or steam), is constructed of high-quality seamless or spirally welded steel pipe and must comply with pressure piping standards (e.g., 100% radiographic inspection).
Insulation
Rigid polyurethane foam (density 60-80 kg/m³) is the primary material, offering low thermal conductivity (0.013-0.03 kcal/m:h·°C) and a closed-cell ratio ≥90%, effectively reducing heat loss. For high-temperature applications (such as steam pipelines), a multi-layer, staggered-stitch composite insulation structure (including an aluminum foil reflective layer) is used, offering a temperature resistance of 150°C-450°C.
Outer Pipe
High-density polyethylene (HDPE) or steel-in-steel (double-layer steel pipe structure) provides corrosion resistance, waterproofing, and mechanical protection. The HDPE outer pipe requires corona treatment on the inner surface, has a density >940 kg/m³, and a tensile strength >20 MPa. The manufacturing process adopts factory prefabrication and integrated molding, including rust removal of steel pipes, foam filling of insulation layer, and packaging of outer protective pipes to ensure that the three layers are tightly bonded.
Core Performance Advantages
Energy Efficiency
Heat loss is only 25% of traditional pipes, and heat loss in the pipeline network is less than 2% (better than the international standard of 10%).
01
Long Life and Corrosion Resistance
The HDPE/Fiberglass outer pipe isolates air moisture, resulting in an extremely low corrosion rate for the working steel pipe, resulting in a lifespan of 30-50 years (3-4 times that of traditional pipes).
02
Waterproof and Moisture-Proof
Closed-cell polyurethane foam has a low water absorption rate (approximately 0.2 kg/m²), and the port seal design prevents water seepage during construction.
03
Safety Monitoring
A built-in leak alarm precisely locates leaks.
04
Economical Construction
Excavation is reduced by over 50% and concrete usage is reduced by 90%. Factory prefabrication combined with on-site trenching shortens construction time by over 50%.
05
Applicable Applications
Central heating/cooling, high-temperature steam transmission, petrochemicals, thermal power plants. District heating, industrial pipelines such as pharmaceuticals, chemicals, and oil pipelines.
Specifications
|
Nominal diameter |
DN20-DN1600. |
|
Pressure capacity |
Nominal pressure ≤ 2.5 MPa (socket-type connection). |
|
Temperature range |
≤ 120°C (peak 140°C) for conventional heating, up to 450°C for steam pipelines. |
Project Cases
Our Factory
Hebei Yugang Pipe Manufacturing Co., Ltd. is located in the Yanshan Economic Development Zone in Cangzhou, in the heart of North China's pipeline industry. Founded in 2005, the company was upgraded in 2014 to a comprehensive group integrating pipeline technology, equipment manufacturing, and accessories production. Technological innovations in 2024 have earned it recognition as a high-tech enterprise. Its main products include 3PE anti-corrosion steel pipes for oil and gas, spiral welded pipes, insulated pipes, and fittings. The company is equipped with five spiral pipe production lines, three anti-corrosion pipe production lines, six insulated pipe production lines, and two straight seam pipe production lines, with an annual production capacity of 300,000 tons. The company is ISO9001 certified, and its products comply with API Spec 5L/5CT/5B international standards.
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