One-Step Flexible Pre-Insulated Pipe Production Line PE-Rt II/Pexa PU Foam HDPE Jacket for District Heating

This one-step production line manufactures flexible pre-insulated pipes with a proven "pipe-in-pipe" (Труба в трубе) structure: a pressure-bearing inner pipe made of PE-RT II or PEXa, a polyurethane (PU) foam insulation layer, and an HDPE outer jacket.
An optional fiber-reinforced layer can be added to increase the pipe's pressure resistance while keeping it flexible.
Inner pipe feeding, continuous PU foam pouring, and outer jacket extrusion are all completed on the same line in one continuous process.
Compared with conventional two-step equipment, integrated efficiency is 20-50% higher, energy consumption is 15-25% lower, and labor demand is reduced by about 40%.
The finished pipes are airtight and watertight - the inner tube is fully protected against chemical corrosion and oxidation. Lightweight, flexible, and supplied in long coils with minimal joints, they require smaller trenches for direct burial and greatly reduce installation costs. Main application: district heating networks (тепловые сети) - transferring heat from the main pipeline to residential communities and buildings. Also widely used in building water supply and cooling systems.