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Steel-Jacketed Steam Insulated Steel Pipe
High-Temperature Steel-Jacketed Insulated Piping for Direct-Buried Steam & Thermal Energy Transmission
Working Pipe:Seamless / LSAW / SSAW Steel Pipe
Steel Pipe Grade:Q235B / Q355B / 20# / 16Mn / L245 / L290 / L360 / L415 / API 5L Gr. B / X42 / X52 / X60 / Other Grades
Operating Temperature:150–350°C Typical
Standards:GB / EN / DIN / ISO / ASTM / API / Other Project Standards
Design Life:≥30 Years
Customization:Steel Grade, Pipe Type, Diameter, Wall Thickness, Insulation Material, Insulation Thickness, Density, Outer Jacket, Anti-Corrosion System and Other Project Requirements
Product Description:
Steel-Jacketed Steam Insulated Steel Pipe is a high-temperature pre-insulated piping system designed for direct-buried steam and thermal energy transmission. It consists of a working steel pipe, thermal insulation layer, corrosion protection system and an external steel jacket.
The steel jacket provides high mechanical strength and reliable protection against external loads, moisture and mechanical damage. The working pipe is designed to accommodate thermal expansion within the outer steel jacket, enabling direct-buried installation without a conventional concrete trench structure.
The system is suitable for high-temperature steam and other thermal media, with operating temperatures of up to 350°C and design pressures of up to 2.5 MPa, depending on the project design. It is widely used in district heating, petrochemical, power generation and industrial thermal pipeline systems.
Specification/Model (mm) | Working steel pipe outer diameter × Wall thickness (mm) | Outer casing steel pipe: outer diameter × wall thickness (mm) | Insulation layer thickness (mm) |
57/219 | 57×3.5 | 219×6.0 | 60 |
76/273 | 76×4.0 | 273×6.0 | 65 |
89/273 | 89×4.5 | 273×6.0 | 70 |
108/325 | 108×4.5 | 325×7.0 | 70 |
133/377 | 133×4.5 | 377×7.0 | 80 |
159/377 | 159×6.0 | 377×7.0 | 85 |
219/478 | 219×6.0 | 478×7.0 | 100 |
273/529 | 273×6.0 | 529×7.0 | 105 |
325/630 | 325×7.0 | 630×8.0 | 125 |
377/720 | 377×7.0 | 720×10.0 | 140 |
426/820 | 426×7.0 | 820×10.0 | 140 |
478/820 | 478×7.0 | 820×10.0 | 140 |
529/920 | 529×7.0 | 920×10.0 | 165 |
630/1020 | 630×8.0 | 1020×10.0 | 165 |
720/1220 | 720×10.0 | 1220×12.0 | 170 |
820/1220 | 820×10.0 | 1220×12.0 | 170 |
920/1320 | 920×10.0 | 1320×14.0 | 170 |
1020/1420 | 1020×10.0 | 1420×14.0 | 170 |
Key Advantages
High-Temperature Performance — Designed for high-temperature steam and thermal media up to 350°C.
High Mechanical Strength — Steel outer jacket provides strong protection against external loads and mechanical damage.
Reliable Waterproofing — Sealed outer structure helps protect the insulation system from groundwater and moisture penetration.
Direct-Buried Installation — Enables underground installation without a conventional concrete trench structure.
Thermal Expansion Accommodation — Working pipe expansion can be accommodated within the outer steel jacket.
Excellent Thermal Insulation — Multi-layer insulation structure reduces heat loss during long-distance thermal transmission.
Strong Corrosion Protection — External anti-corrosion protection can be configured according to soil and operating conditions.
Long Service Life — Robust steel-jacketed structure is designed for long-term underground operation.
Project-Specific Configuration — Working pipe, steel grade, insulation system, jacket dimensions and corrosion protection can be customized.
Applications
District Heating · High-Temperature Steam Transmission · Centralized Heating Networks · Power Plants · Petrochemical Industry · Chemical Plants · Industrial Steam Systems · Thermal Energy Transmission · Municipal Heating Infrastructure · High-Temperature Process Piping
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