Ludwig Pfeiffer

Subline

Ludwig Pfeiffer Subline

Subline is a pipeline relining method perfectly suitable for permanent rehabilitation of very long distances and large diameters. This technique integrates the folding of the inliner into the pulling-in process. It works by using an hydraulic folding and feeding machine on site.


The subline process is characterized by folding the inliner into a U-shape. The subline machine folds the PE liner on site and thus reduces its cross-section. The folding is being executed in the elastic region of the material and the folded inliner is then being fixed with retaining straps which are made of PE. Thus, damages to the outer wall of the inliner can be avoided.

your benefits

  • Close-fit process for rehabilitation without annular space
  • Pressure stages from SDR 26 to SDR 80
  • Diameters from DN 150 to DN 1600
  • Improved hydraulic capability of new pipeline
Ludwig Pfeiffer Subline-Verfahren U-Form