This steam insulated pipeline is a prefabricated, direct-buried "steel-in-steel" product developed by Xingbang specifically for high-temperature steam transmission (150°C to 350°C). Capable of withstanding operating pressures up to 2.5 MPa, it is suitable for applications such as municipal district heating, petrochemical processing, and industrial park steam supply. The product is available in both "inner-sliding" and "outer-sliding" structural configurations. It limits temperature drop to within 3°C per kilometer and reduces heat loss by more than 40% compared to traditional piping. The outer casing features 3PE anti-corrosion protection and an intelligent leak monitoring system, with a design service life of 25 to 30 years.
Product Specifications
|
Carrier pipe diameter (DN) |
Insulation layer thickness |
Outer casing outside diameter (Dc) |
Minimum wall thickness of outer casing (emin) |
|
300 |
30-50 |
393-433 |
4.0 |
|
350 |
30-50 |
445-485 |
4.0 |
|
400 |
30-60 |
494-554 |
4.0 |
|
450 |
30-60 |
547-607 |
4.5 |
|
500 |
30-60 |
598-658 |
4.5 |
|
600 |
30-60 |
700-760 |
5.0 |
|
700 |
30-60 |
790-850 |
5.0 |
|
800 |
30-60 |
891-951 |
5.5 |
|
900 |
30-60 |
992-1052 |
6.0 |
|
1000 |
30-60 |
1093-1153 |
6.5 |
|
1100 |
30-60 |
1194-1254 |
7.0 |
|
1200 |
40-100 |
1316-1436 |
8.0 |
|
1400 |
50-120 |
1538-1678 |
9.0 |
|
1600 |
60-150 |
1760-1944 |
11.0 |
Sliding Structure
Based on the method of accommodating thermal expansion displacement of the carrier steel pipe, the product is available in two structural configurations:
Internal sliding type: The carrier steel pipe slides within the insulation layer. This structure is compact and moderately priced, making it a common choice for domestic projects. It is suitable for general operating conditions, and its moisture venting performance generally meets requirements.
External sliding type: The carrier steel pipe and the insulation layer slide as a single unit against the inner wall of the outer casing, with a wide air gap maintained between the insulation layer and the outer casing. This structural design offers straightforward stress analysis and superior moisture-venting capabilities; it is widely adopted internationally and is becoming the mainstream choice in the domestic market. It is particularly suitable for projects with high groundwater levels and strict requirements for moisture venting.
Key Advantages
High-Temperature and High-Pressure Resistance
Suitable for temperatures up to 350°C and operating pressures up to 2.5 MPa, with a burst pressure at least three times the operating pressure, meeting the demands of high-temperature steam transport in industrial and municipal sectors.
High Efficiency and Energy Saving with Minimal Heat Loss
Features a multi-layer composite gradient insulation structure combined with an aluminum foil reflective layer. Heat loss is reduced by over 70% compared to traditional piping, with a temperature drop of less than 3°C per kilometer, resulting in significant energy cost savings during long-term operation.
Excellent Corrosion Resistance and Long Service Life
The outer steel casing is protected by 3PE or fusion-bonded epoxy (FBE) coatings and cathodic protection technology, effectively resisting corrosion from soil and groundwater. The design service life is 25–30 years.
FAQ
Q: What is the difference between this steam-insulated pipeline and standard polyurethane-insulated piping?
A: Standard polyurethane-insulated piping is suitable for lower-temperature media (such as hot water, ≤140°C). In contrast, prefabricated underground steam pipelines are specifically designed for high-temperature steam. They utilize a composite structure combining inorganic insulation materials (such as aluminum silicate or glass wool) with polyurethane, offering higher temperature resistance, a more complex structure, and a higher grade of corrosion protection.
Q: Can this steam-insulated pipeline be connected to pipes from other manufacturers?
A: Yes, connection is possible, but interface compatibility must be considered. Specifications regarding pipe diameter, insulation materials, and outer casing anti-corrosion coatings may vary between manufacturers. We recommend verifying detailed product parameters from both parties before connection. If necessary, Xingbang technical personnel can provide on-site guidance for joint processing to ensure connection quality.
Q: What are Xingbang's technical capabilities in this product field?
A: As a participant in drafting industry standards (CJ/T 246, CJJ/T 104), Xingbang holds over 130 national patents and operates five provincial-level R&D platforms, including the Hebei Provincial Industrial Technology Research Institute for Thermal Insulation Pipelines. Its testing center is CNAS-accredited and capable of comprehensive performance testing for insulation and anti-corrosion layers, ensuring product quality.
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