Description
Steel Pipes in Reinforced Insulation (RI) are modern heat-insulated structures with combined protection, designed for operation in particularly complex conditions with increased requirements for durability and thermal efficiency.
Production Technology

The manufacturing process includes enhanced stages:
1.    Pipe Preparation: The steel pipe is cleaned by abrasive blasting to degree Sa 2.5.
2.    Applying Anti-Corrosion Coating: Epoxy or polyurethane coating with a thickness of 200-400 µm is applied.
3.    Quality Control: Tests for adhesion, strength, and heat resistance are conducted.

Technical Characteristics
•    Diameter Range: DN 57 - DN 1420 mm
•    Heat Carrier Temperature: up to 150°C (short-term up to 170°C)
•    Thermal Conductivity: 0.029-0.031 W/m∙°C
•    Service Life: 40 years and more
•    Thermal Resistance: ≥ 2.0 m²∙°C/W
•    Compressive Strength: ≥ 0.3 MPa

Advantages
•    Increased Durability due to combined protection.
•    Exceptional Thermal Efficiency – heat loss less than 1°C per km.
•    Resistance to Mechanical Damage and groundwater.
•    Versatile Application for all types of laying.
•    Reduced Operating Costs by 50-60%.
•    Repair Possibility and insulation restoration.

Areas of Application
•    Main Heating Mains of increased responsibility.
•    Industrial Pipelines with high parameters.
•    Underwater Crossings and sections with high groundwater level.
•    Seismically Active Areas.
•    Facilities with Increased Requirements for reliability.

Normative Documentation
Main Standards:
•    GOST 9.602-2016 "Unified system for corrosion and ageing protection. Underground structures."
•    GOST R 51164 "Steel main pipelines. General requirements for protective coatings."
•    GOST 31445-2012 "Seamless hot-deformed pipes for boilers and high-pressure pipelines."
Quality Control:
•    Ultrasonic testing of welds.
•    Impact toughness tests.
•    Coating adhesion checks.