Prefabricated buried steel sleeve steel insulation pipe

Prefabricated Buried Steel Sleeve Steel Insulation Pipe: Product Introduction

Overview
Prefabricated buried steel sleeve steel insulation pipes (also known as "steel-sleeved steel insulated pipes" or "double-walled insulated pipes") are advanced piping systems designed for high-efficiency thermal insulation and corrosion resistance in underground applications. They are widely used in district heating systems, oil and gas transportation, chemical industries, and other scenarios requiring long-distance, high-temperature fluid conveyance with minimal heat loss.

Structure and Components

The pipe features a multi-layer composite structure, ensuring durability and thermal efficiency:

Inner Steel Pipe (Working Pipe):

Carries the high-temperature fluid (e.g., hot water, steam, or oil).

Made of carbon steel or alloy steel, selected based on pressure and temperature requirements.

Insulation Layer:

Typically composed of rigid polyurethane foam (PUR) or other high-performance insulating materials.

Minimizes heat loss and maintains fluid temperature during transmission.

Outer Steel Casing (Protective Sleeve):

Acts as a waterproof, mechanical protection layer.

Made of anti-corrosion steel (e.g., pre-coated or galvanized steel) to resist soil stress and environmental damage.

Leak Detection System (Optional):

Integrated alarm wires between the insulation layer and outer casing to detect leaks or damage early.

Key Features

High-Temperature Resistance:

Suitable for fluids up to 150°C (steam or hot water).

Corrosion Resistance:

Outer casing is treated with anti-corrosion coatings (3PE, epoxy, etc.) for long-term underground use.

Low Heat Loss:

Insulation efficiency exceeds 90%, reducing energy waste.

Mechanical Strength:

Steel casing protects against soil pressure, impact, and seismic activity.

Long Service Life:

Designed for 30–50 years with minimal maintenance.

Prefabricated Design:

Factory-manufactured sections ensure consistent quality and simplify on-site installation.

Applications

District Heating/Cooling Systems: Transporting hot water or steam for urban heating networks.

Oil & Gas Pipelines: Insulated transport of crude oil, natural gas, or refined products.

Chemical Industry: Conveying high-temperature chemicals or hazardous fluids.

Industrial Plants: Steam lines, exhaust systems, and thermal energy recovery.

Advantages Over Traditional Pipes

Faster Installation: Pre-insulated, prefabricated sections reduce on-site labor and time.

Lower Maintenance Costs: Robust design minimizes leaks and repairs.

Environmental Protection: Reduced heat loss lowers carbon emissions.

Leak Monitoring: Optional sensors enable proactive maintenance and prevent environmental hazards.

Installation Considerations

Buried directly underground with sand or soft soil padding to avoid mechanical damage.

Joints are sealed with hydrophobic materials to maintain insulation integrity.

Requires strict quality control during manufacturing and installation (e.g., foam density, welding standards).

Conclusion
Prefabricated buried steel sleeve steel insulation pipes are a reliable, energy-efficient solution for high-temperature fluid transportation. Their combination of durability, thermal performance, and smart monitoring capabilities makes them ideal for modern infrastructure projects prioritizing sustainability and cost-effectiveness.