The protective shell made ​​of fiberglass reinforced plastic (GRP)

Our pipe insulation allows for optimal work in the area of trenchless pipe jacking. The enormous wear resistance, which is not provided by conventional PE/PP insulation processes, prevents damage during the installation process. This ensures a time-saving, cost-effective process on site, since damaged pipes do not need to be replaced and cathodic corrosion protection does not need to be provided.

The hard coating made of glass fiber and synthetic resin acts as an additional protective coating around the pipe. The GRP is cured using UV light, without mixing in hardening agents or catalysts, which allows the plastic to be cured quickly and completely at any time. The protective shell, only 5 mm thick, thus provides the best possible safety given the requirements for electric strength (25 kV) – safety that is worthwhile in every case, because if the final test for electric strength is positive, the defective spot must be located and repaired, and the entire work process repeated.

Partial insulation
Welded joints are especially vulnerable to damage from environmental factors, since they can only be insulated retroactively. In addition, the process must take place on site. The use of GRP allows us to complete this process in a very short amount of time, thereby preventing later damage to the joints. Working in a lightproof tent with targeted UV lights cures the material in a controlled manner. A curing process “from the outside in” also prevents vapor from forming.
 
The benefits of partial and complete pipe insulation


 
The reason for GRP skid plates
Skid plates, also known as spacers, are used as protection when drawing liners into an existing pipeline. Currently, plates made of polyethylene are used. However, these can break off even during the draw-in process, or they cannot withstand the load for large dimensions in the long term.

One very cost-intensive and time-consuming possibility, which also wastes resources, is immersing the welded pipeline, which can be several hundred meters in length.
Alternatively, this significant expense and effort can be avoided by using GRP skid plates.

Extensive tests of the spacers at test installation sites in mid-2010 showed that they were able to withstand the load. The local thickness increase on the outside of the pipe by a factor of 10 showed minimal wear, and they allowed safe and fast draw-ins into the existing channel.

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