Ludwig Pfeiffer

Slipline

The slipline method is used for cost-effective rehabilitation of long sections. The inliner uses standard PE pipes welded together to form a pipeline.


After the old pipe has been carefully cleaned and inspected by a camera, all protruding obstacles are removed. The diameter of the inliner has to be smaller than that of the host pipe. The pipe sections are joined by butt welding to form piping that is then fixed to a pulling head. A winch pulls the inliner into the old pipeline. A lubricant can be used to reduce friction.

During the entire drawing-in process the tensile forces produced are monitored and recorded, thus preventing additional stress of the PE material.

When the inliner has reached its final position, a layer of insulating material (grout) is injected into the annular gap between new and host pipe. The result is a pipeline in as-new quality. The host pipe does not need to have any load-bearing capacity whatsoever thanks to the structural stability of the inliner.

the benefits

  • Fast installation due to long pipe strings
  • Suitable even for pipes that are no longer structurally stable
  • Outstanding hydraulic properties due to smooth inner surfaces