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Close-fit lining – onsite deformed pipes

For this procedure standard PE-HD pipes are welded to a string, then deformed on site and pulled into the existing pipeline.

The cross-section is reduced for pipes deformed on site by means of a mechanical working process carried out by the customer. In the course of this welded standard PE pipes are pulled through a reduction tool and the cross-section is thus reduced by 25% - 30% to facilitate the introduction of the new pipe into the old one.

After insertion the pipe expands again and gets a close fit to the existing pipe. The cross-section is only slightly reduced compared with the old pipe (twice the wall thickness of the liner pipe).

The pipes are exclusively installed via correspondingly dimensioned trenches.

Fields of application:

  • Suitable for pressure and open channel pipelines
  • Drinking and waste water, gas and industrial applications are possible
  • DN 100 - 1500 mm.
  • Circular profile
  • Material: PE-HD
  • Lateral connection mostly in cut-and cover construction method or with specific welding suitable cap profiles for PE-HD liners for waste water applications
  • Calibration of old pipes required


  • Short construction time
  • No remaining annular space; no filling required
  • Insignificant cross-section reduction (twice the wall thickness of the liner pipe)
  • The liner is hydraulically very smooth and resistant against aggressive waste water and mechanical stresses;


  • Earthworks for trenches required
  • High-quality welding of pipes necessary
  • Significant space requirements for laying-out the pipe-string;
  • Risk of incomplete recovery (folding) of the new pipe - particularly in the case of position deviation, drift and nominal dimensions tolerances in the old pipe;
  • Not suitable for damage such as position deviation and pipe collapse
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