isoplus manufactures both traditional ”rigid” steel-in-plastic piping and flexible piping systems which are particularly suitable for service connections and small distribution networks where pipe flexibility allows subsurface obstructions to be easily avoided.
Flexible piping is available with carrier pipes of PEX, AluPEX, steel or copper.
All systems are effectively insulated with polyurethane foam and protected against moisture ingress by an impact and fracture resistant PE jacket pipe. This ideal sandwich construction ensures optimum operational reliability and a technical lifetime of at least 30 years.
Thanks to the most up-to-date laying methods, the costs of installing an isoplus system are significantly reduced. The need for traditional (and expensive) expansion elements like L, Z and U bends is thereby largely avoided, thus providing considerable savings, both with respect to the required components and the necessary excavation work.
Our systems are suitable for carrying a wide variety of media, including district heating water, domestic water, steam, cooling media and many forms of industrial fluids.
isoplus pre-insulated steel pipes can withstand continuous operating temperatures of up to 149°C, while our flexible piping can withstand continuous operating temperatures of 80°C to 130°C, depending on carrier pipe type and operating pressure.
Pre-insulated pipes are produced in either a discontinuous or continuous process.
In discontinuous production, lengths of carrier pipe are inserted into a jacket pipe. To ensure that the carrier pipe is centred within the jacket, plastic spacers are attached to the carrier pipe before insertion. The spacers are also used to hold alarm wires (if used) in place.
The cavity between the carrier pipe and jacket is then filled with polyurethane foam. Foaming is accomplished by high-pressure foaming machines, thus ensuring uniform foam density throughout the length of the pipe.
In principal, pipes of infinite length can be insulated on our fully automated continuous production line. The plant is used to produce both flexible piping, supplied in coils, and straight pipes.
QA personnel regularly check foam samples for compliance with EN 253 and perform final inspection, checking that all dimensions are within permissible tolerances.
The scope of our quality management system has been described in detail in connection with our ISO 9001 certification.
Fittings are insulated and foamed on a turntable where individual components are secured in fixtures to ensure compliance with dimensions and tolerances before being foamed in the same way as the pipes.
All fittings are checked for compliance with DS/EN 13941.
Detailed descriptions of the raw materials used to produce the various piping systems are available in section 2 in our catalogue.
Polyurethane (PUR) foam is used to insulate all isoplus piping systems, irrespective of carrier pipe type.
Polyurethane foam consists of two main components:
Both components are delivered to our production facilities in tankers and transferred to storage tanks that are surrounded by diffusion-proof walls and equipped with overflow pipes to meet environment and safety requirements.
Cyclopentane is used as the blowing agent.
The polyurethane insulation is protected by a jacket pipe of polyethylene (PE).
To ensure jacket pipes of superior quality, isoplus only uses raw materials from recognised suppliers.
High-density polyethylene (HD-PE) is used in the production of traditional straight pipes.
Jacket pipes of HD-PE are mainly produced on our own extrusion equipment. QA personnel regularly check jacket pipe samples for compliance with EN 253.
To ensure a high degree of flexibility, low-density polyethylene (LD-PE) is used in the continuous production of flexible pipes.
The LD-PE jacket pipe is extruded continuously over the foam insulation. LD-PE jacket pipes are also regularly inspected by our QA personnel.