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The reduction process was developed for the rehabilitation of pressure pipelines in the wastewater, drinking water and gas sectors. 

As part of the reduction process, a PE pipe run is drawn though a die that elastically deforms the PE pressure pipe under a continuous axial tensile load and briefly reduces the cross section by up to 12%. The pipe run with its reduced cross section is then drawn into the old pipe. After insertion and the elimination of tensile stress, the PE pipe returns to its original outside diameter and clings to the inside wall of the old pipe to create a "close fit".

The outcome of this rehabilitation method is a new, independently load-bearing pressure pipe that merely reduces the original hydraulic capacity of the pipeline by the wall thickness of the PE liner. In functional terms, the old pipe is no longer used after rehabilitation.

As a system manufacturer, SIMONA offers for the reduction process not only pipes and electrofusion sockets but also application-specific fittings depending on the special dimensional requirements.

Rehabilitation range

DN 100 – DN 1200 
SDR 11 – SDR 26

Insertion lengths up to 1,000 m are irrespective of diameter.


Rehabilitation of gas and water pipelines by PE relining without annular space 
DVGW Worksheet GW 320-2

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