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Pre-insulated single pipes in DN20–DN500, available in multiple insulation classes and customized lengths for district heating installations.
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Our pre-insulated single pipes are manufactured with a steel medium pipe, insulated with polyurethane foam (PUR), and enclosed by a protective HDPE jacket (PE100).
They are available in sizes ranging from DN20 to DN1000 and can be supplied in lengths of 6, 12, 16, or 18 meters. The single pipes are offered in insulation classes 0–4, allowing customization to meet energy requirements and ground conditions.
For applications with high temperatures, dual-layer insulated pipes are also available. The pipes can be delivered as straight, cut, or curved sections.
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Use $item["name"] for Heatflex
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HeatFlex is a pre-insulated, flexible piping system with PE-Xa media pipes and high-efficiency polyurethane foam (PUR) insulation.
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HeatFlex is a pre-insulated, flexible piping system with PE-Xa media pipes and high-efficiency polyurethane foam (PUR) insulation. The system is specifically designed for district heating applications where tight bending radii, narrow trenches, and quick installation are crucial.
Thanks to its low thermal conductivity (λ = 0.021 W/m·K), HeatFlex offers excellent insulation performance. For projects with particularly high energy efficiency requirements, an alternative insulation series with further improved thermal properties is available.
HeatFlex is available as a single or twin-pipe system, with dimensions up to DN125, and is designed for a maximum operating pressure of 6 bar at 80°C (temporarily up to 95°C). Its service life is dimensioned according to EN 15632-2, ensuring at least 30 years of operation under normal load conditions.
The corrugated PE-LLD outer casing provides high flexibility and mechanical durability. HeatFlex is an excellent choice for both new constructions and renovation projects where the combination of performance and ease of installation is essential.
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Use $item["name"] for Twin pipes
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Compact twin pipes in DN20–DN200 with efficient insulation, ideal for parallel flows and confined shafts.
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Twin pipes are a space-saving and energy-efficient solution where both the supply and return pipes run parallel within a common outer casing. This system is particularly well-suited for urban environments and installations with limited space, where reduced trenching and fewer welds are advantageous.
The pipes are manufactured in standard lengths of 6, 12, or 16 meters, with dimensions ranging from DN20 to DN200. They can also be supplied as cut pipes or curved pipes, depending on the project’s requirements. This provides flexibility during both design and installation.
Each twin pipe consists of two steel medium pipes, insulated with polyurethane foam (PUR) and enclosed by a PEH jacket (PE100). The insulation is offered in series 1, 2, and 3, allowing for customization of insulation thickness to meet energy requirements, ground conditions, and operational parameters.
The system complies with the applicable standards for district heating and combines excellent thermal performance with ease of handling in the field. Twin pipes are an efficient choice for projects that require both functionality and cost-effectiveness.
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Use $item["name"] for FibreFlex
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FibreFlex is a pre-insulated, flexible piping system with a media pipe made of fiber-reinforced, cross-linked polyethylene (PEX).
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FibreFlex is a pre-insulated, flexible piping system with a media pipe made of fiber-reinforced, cross-linked polyethylene (PEX). Thanks to the aramid fiber reinforcement, the pipe walls can be made thinner, reducing the outer diameter and improving insulation performance.
The system is designed for a continuous operating pressure of 10 bar at 80°C, making it a powerful alternative to traditional flexible pipes. Its construction allows for tight bending radii and easy installation in complex environments.
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Use $item["name"] for Flexible pipes
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Insulated flexible pipes in copper, steel, or PEX—ideal for complex or space-restricted installations.
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Flexible pipe systems are an optimal choice for installations that require flexibility, tight radii, or where ground conditions impose specific demands on movement freedom. We supply insulated flexible pipes with copper, steel, or PEX as the medium pipe, suitable for both permanent infrastructure and temporary connections.
We also offer flexible pipes in copper, steel, or PEX—available in both single and twin configurations—for maximum flexibility in both planning and execution. The pipes are pre-insulated and compatible with our standardized jointing and coupling solutions.
The system is particularly well-suited for smaller dimensions, winding sections, tunnel connections, and other space-restricted environments where traditional straight pipes are not practical.
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Use $item["name"] for FibreFlex Pro
Use $item["category"] for RK Infra
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FibreFlex Pro is a pre-insulated, flexible piping system with a high-temperature-resistant, fiber-reinforced media pipe, designed for use up to 115°C and 10 bar.
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FibreFlex Pro is a pre-insulated, flexible piping system with a high-temperature-resistant, fiber-reinforced media pipe, designed for use up to 115°C and 10 bar.
Thanks to aramid fiber reinforcement, the pipes achieve mechanical strength approaching that of KMR steel pipes while maintaining flexibility. The system offers easy handling, low installation costs, and excellent thermal insulation.
FibreFlex Pro is ideal for modern district heating networks where both high performance and efficient installation are required.
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A comprehensive range of pipe fittings, including bends, T-pieces, and valves, for both single and twin pipe systems.
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To enable complete system solutions, we offer a comprehensive range of pipe fittings for both single and twin pipe systems. The range includes elbows, T-pieces, valves, compensators, anchors, and reducers, all manufactured according to applicable European standards.
The fittings are available in various insulation classes and dimensions to match the different pipe systems in our portfolio. We also offer custom solutions and prefabricated components to reduce installation time and enhance the overall system efficiency.
All pipe fittings maintain the same high quality as our main pipes and play a crucial role in building reliable and sustainable district heating networks.
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Use $item["name"] for FibreFlex Pro 16
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FibreFlex Pro 16 is the most advanced version in the FibreFlex series, designed for systems with extremely high temperature (up to 115°C) and pressure (up to 16 bar) requirements.
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FibreFlex Pro 16 is the most advanced version in the FibreFlex series, designed for systems with extremely high temperature (up to 115°C) and pressure (up to 16 bar) requirements.
With a denser reinforcement of high-temperature-resistant aramid fiber, this system offers a unique alternative to traditional steel pipes while maintaining all the benefits of flexible installation, tight bending radii, and reduced trenching costs.
This makes FibreFlex Pro 16 particularly suitable for demanding distribution networks and heavily loaded transmission lines.
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Use $item["name"] for Sleeves
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Our sleeve system consists of double-seal and double-expanding shrink sleeves as well as welding sleeve type Mittel or shrink weld sleeve.
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A reliable sleeve system is crucial to ensure a tight, durable, and long-lasting joint in district heating installations. Our range includes double-sealing and double-expanding shrink sleeves, Mittel-type welded sleeves, and shrink-welded sleeves, all developed to meet high demands for operational reliability and moisture protection.
In addition, we offer a full range of T-sleeves, reduction sleeves, end sleeves, and other special sleeves, tailored for both single and twin pipe systems. All components are designed to withstand large temperature fluctuations, ground movements, and long operational cycles—without compromising insulation performance.
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Use $item["name"] for Fittings and accessories
Use $item["category"] for RK Infra
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RK Infra offers a complete range of fittings, tools, and insulation accessories for its flexible piping systems.
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RK Infra offers a complete range of fittings, tools, and insulation accessories for its flexible piping systems, designed for fast and secure installation with high long-term performance.
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HeatFlex & PEX Sanitary
The PE-Xa media pipes (SDR11 and SDR7.4) are connected using press fittings or compression fittings, such as weld and threaded adapters, couplings, bends, and T-pieces.
Press fittings require a pressing tool, which can be ordered from RK Infra. Compression fittings, on the other hand, can be installed without special tools—the force is applied via an external sleeve system where a clamping screw is tightened with a standard Allen key. This ensures a quick and reliable connection, even in the field.
FibreFlex & FibreFlex Pro
The press fittings for the FibreFlex systems feature an additional polymer sleeve that enhances the seal and allows for direct installation without the need to expand the pipe ends. For dimensions up to 110 mm, standard PE-Xa tools (SDR11) are used, while for larger dimensions, RK Infra provides specially adapted pressing tools.
The connection points are insulated with dedicated joint insulation systems, providing complete protection against heat loss and moisture infiltration.
Prefabricated components & half-shells
To minimize welding and on-site assembly, RK Infra offers a wide selection of prefabricated, pre-insulated steel components. The press transitions are welded directly onto the steel parts and can then be connected using pressing tools.
All flexible piping systems can also be complemented with half-shells in a click system, designed for easy and quick insulation of joints and connections without the need for glue, screws, or shrinking. The system ensures high installation quality and optimal insulation performance.
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