Single pipe – Straight pipe

In discontinuous production technology spacers are fixed to the carrier pipe to which leak detection wires can be attached. The pipe prepared in this way is then inserted into the outer casing and the annular gap at the pipe ends is sealed with foam caps. The pipe is then clamped to the foaming table and the PUR foam is mixed at ~130 bar at one end of the pipe using an electronically-controlled mixing head and injected into the pipe.
Following the development of rigid pipes, this procedure has become established as the most common production process and is listed as a technical standard in all the applicable specifications and guidelines. In the production process of fittings such as bends, branches, etc., only this method is used.
We can produce the following sizes using this process:
Single pipes DN 20 to DN 1000, twin pipes DN 20 to DN 250, all fittings

In continuous production technology the tubular steel rods are sandblasted in the first step of the production line and then coupled together mechanically. This string of pipes will then receive the leak detection wires, the polyurethane insulation layer, a diffusion barrier-foil, and the extruded polyethylene outer casing in a continuous and CNC-controlled process. The barrier-foil consisting of an aluminium compound material prevents diffusion of the PUR cell gas through the PE outer casing. A special coating of this barrier-foil ensures that the minimum shear strength required in accordance with DIN EN253 is exceeded and that the basic or compound principle of the friction-locked construction method for rigid pipes remains intact.
The diffusion barrier layer, which we insert between the foam and the protective casing, reliably prevents the insulation system from ageing - the optimised insulation properties therefore remain virtually constant over the entire service life of the pipe. For the operation of a district heating network, this provides an optimum basis for keeping energy efficiency high and heat losses and CO2 emissions low on the generator side. The positive effects on our environment as well as for the expenses for network losses during the total lifetime are considerable.
We can produce the following sizes using this process:
Single pipes DN 25 to DN 200, twin pipes DN 20 to DN 100