Xingbang's pre insulated underground steam pipe is a direct-burial piping product specifically designed for the transmission of high-temperature steam (150°C to 350°C). It utilizes a "steel-in-steel" structure-comprising an inner steel carrier pipe, a multi-layer composite insulation layer, an outer steel casing, and an anti-corrosion coating-and supports operating pressures up to 2.5 MPa. It is suitable for applications such as municipal district heating, petrochemical processing, and centralized steam supply for industrial parks. The product offers both "inner-sliding" and "outer-sliding" structural configurations to accommodate varying thermal expansion compensation requirements. Its multi-layer graded insulation, combined with an aluminum foil reflective layer, limits the temperature drop to within 3°C per kilometer and reduces heat loss by over 40% compared to traditional piping materials. The outer casing features a 3PE anti-corrosion coating and an intelligent leak monitoring system, ensuring a service life of 25–30 years and safe, long-term operation in direct-burial underground environments.
Specifications
|
Specifications/Model |
Working steel pipe: Outer diameter × Wall thickness (mm) |
Outer steel pipe: Outer diameter × Wall thickness (mm) |
Insulation layer thickness (mm) |
Air layer thickness (mm) |
|
57/219 |
57*3.5 |
219*6.0 |
60 |
15 |
|
76/273 |
76*4.0 |
273*6.0 |
77 |
15.5 |
|
89/273 |
89*4.5 |
273*6.0 |
70 |
16 |
|
108/325 |
108*4.5 |
325*7.0 |
85 |
16.5 |
|
133/377 |
133*4.5 |
377*7.0 |
100 |
15 |
|
159/377 |
159*6.0 |
426*7.0 |
110 |
16.5 |
|
219/478 |
219*6.0 |
478*7.0 |
110 |
16 |
|
273/529 |
273*6.0 |
529*7.0 |
110 |
11 |
|
325/630 |
325*7.0 |
630*8.0 |
130 |
14.5 |
|
377/720 |
377*7.0 |
720*10.0 |
150 |
11.5 |
|
426/820 |
426*7.0 |
820*10.0 |
172 |
15 |
|
478/820 |
478*7.0 |
820*10.0 |
150 |
11 |
|
529/920 |
529*7.0 |
920*10.0 |
170 |
15.5 |
|
630/1020 |
630*8.0 |
1020*10.0 |
170 |
15 |
|
720/1220 |
720*10.0 |
1220*12.0 |
223 |
15 |
|
820/1320 |
820*10.0 |
1320*12.0 |
223 |
15 |
Product Advantages
High-Temperature and High-Pressure Resistance
Suitable for temperatures up to 350°C and pressures of 2.5 MPa; the burst pressure is three times the working pressure.
01
Low Heat Loss & Energy Efficiency
Features a multi-layer composite gradient insulation structure combined with an aluminum foil reflective layer; reduces heat loss by over 40% and limits temperature drop to within 3°C per kilometer.
02
Corrosion Resistance & Long Service Life
The outer casing features a 3PE anti-corrosion coating and cathodic protection, offering a design service life of 25–30 years.
03
Efficient & Economical Installation
Direct-burial laying reduces civil engineering work by 70% compared to traditional trench methods and cuts construction time by more than 50%.
04
Smart Safety Features
Built-in moisture exhaust pipes double as leak detection systems, providing real-time monitoring and early warnings to ensure safe operation.
05
Applications
Municipal district heating high-temperature steam trunk networks
Petrochemical enterprise steam transmission networks
Industrial park centralized steam supply systems
Power plant waste heat utilization steam transmission
Coal-to-gas plant steam pipelines
FAQ
Q: What is the applicable temperature range for pre insulated underground steam pipes?
A: Typically suitable for medium temperatures between 150°C and 350°C with working pressures not exceeding 2.5 MPa. Custom designs are available for medium temperatures exceeding 350°C based on specific operating conditions.
Q: What is the difference between "inner-sliding" and "outer-sliding" structures? How should I choose?
A: Inner-sliding: The working steel pipe slides inside the insulation layer, while the insulation material remains fixed relative to the outer casing. This structure is compact and moderately priced, making it a common choice for domestic projects. Outer-sliding: The working steel pipe and insulation layer slide together against the inner wall of the outer steel casing. This design offers a wider air insulation gap, superior moisture exhaust performance, and simpler structural stress analysis. It is widely used internationally and is increasingly becoming a mainstream choice in the domestic market.
Q: How can leaks be detected during pipeline operation?
A: The product features a built-in moisture exhaust pipe that also serves as a leak detection and alarm device. In the event of a leak, changes in humidity or temperature within the insulation layer trigger an abnormal signal in the exhaust pipe, enabling operations and maintenance personnel to quickly pinpoint the location and avoid the need for extensive, large-scale inspections.
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