Pre-Insulated Piping Solutions



The production of Electric Resistance Welded (ERW) pipes and Spiral Arc Welded (SAW) steel pipes is in accordance with the EN 10217.1 standard. Steel drawn pipes, stainless steel pipes, copper pipes, high-density polyethylene (HDPE100) pipes, PPR, PPR-C, CTP (glass fiber reinforced polyester pipe), and CTE (glass fiber reinforced epoxy pipe) are produced following the EN 10216.1 standard. These pipe types can serve as service pipes.

As a protective cover, a UV compounded, black, high-density PE100 casing pipe is used, with a density greater than 940 kg/m3. The specifications and sizes of these high-density, seamless polyethylene pipes adhere to the TS EN 253 standard. The casing remains attached to the pipe due to the corona process, ensuring permanent connections with PUR rigid foam.

Insulation is provided by polyurethane, specifically polyurethane rigid foam, which includes compound A (polyol) and compound B (isocyanate). This can be continuously processed with heat conductivity of 0.0274 W/(mK) or 0.0275 W/(mK), as per the TS EN 253 standard. The foam has a minimum density of 60 kg/m3 and can handle fluid temperatures up to 120℃, with occasional peak fluid temperatures of 140℃. The heat conductivity coefficient remains constant throughout the insulation’s lifespan (at least 30 years), resulting in minimal heat loss and stable operating costs. Its installation is straightforward, saving time and labor, and reducing workmanship errors. It doesn’t require a gallery and can be buried underground.

The use of extension elements (compensators) is either eliminated or minimized due to the manufacturing technique. In gallery applications that are over console, bearers are applied on the external casing, preventing the formation of heat foams. The service pipe and cover pipe can be made of different materials depending on the project. Pipe lengths can be manufactured at 6, 8, or 12 meters, depending on the diameter. Production can include an observation wire to comply with the leakage observation system.

Front Isolated Geothermal Pipe Inserts

Branch Separator


Parallel TE

Fixed Abutment



Relationship Between Estimated Life and Continuous Operating Temperature

EN/DIN 253 refers to pre-insulated bonded pipe systems for directly buried hot water networks, featuring a steel service pipe, polyurethane thermal insulation, and an outer polyethylene casing.

EN 448 relates to fitting assemblies for these systems, while EN 488 pertains to shut-off valves, and EN 489 covers the joint assembly. All these standards define components for pre-insulated, directly buried hot water networks comprising steel service pipes, polyurethane insulation, and polyethylene outer casing.

In terms of size, for ERW/LSAW pipes, the diameter ranges from Ф25 to Ф630mm, with a length of 6m. SSAW pipes have a diameter between Ф219mm and Ф3620mm with a length of 12m. SMLS pipes vary from 10.3 to 1020mm in diameter and 2mm to 40mm in thickness (1/4″ to 40″). The wall thickness is between 1.24mm and 60mm (SCH10-SCH160), and lengths are typically 5.8M, 6M, 11.8M, or 12M, but can also be customized to the customer’s requirements.

We specialize in supplying and manufacturing top-quality pre-insulated steel pipes in line with EN/DIN 253 standards, tailored to the delivery conditions and unique specifications of our industrial and commercial clients. We are flexible with special pipe sizes and delivery conditions, and offer a variety of solutions for purchasing departments, allowing them to choose alternative grades without having to specify product specifications.



  • Fran

    2024年5月19日 at am12:53

    What are pre-insulated pipes?

    • Ronsun2023

      2024年5月19日 at am11:46

      Pre-insulated polypropylene pipes are used to transport fluids through a piping system. They are designed with a thermal insulation coating on the outside and a polypropylene or polyethylene inner tube, which gives themexcellent chemical and thermal resistance.

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In addition to our pipe & fittings stock, Cutting, Testing and Supplement Services, and to the above mentioned services, we also offer large/hard to find items in ….Flanges,Fittings,Tube / Pipe.