Ludwig Pfeiffer

Compact Pipe


Munich [Germany]

For long distances and minimum space requirements.

Compact Pipe is applied for trenchless rehabilitation of broken potable water, sewage, gas and industrial pipelines made of conventional materials such as cast iron, steel, vitrified clay or asbestos cement. Due to its minimum space requirements, this form-andfold method can perfectly be used in inner-city areas. Depending on diameter, up to 600 m at a time can be rehabilitated using the Compact Pipe method, known as close-fit process.

After the old pipe is being cleaned with high pressure or mechanically, it is being inspected with a CCTV-camera. The new pipe is supplied factory-folded and wounded in continuous length on a steel drum. The C-shaped pipe is placed into the rehabilitation section. Axial flexibility allows a direct insertion via small sized access points. Once pulled in, the ends are sealed and a purposely built installation unit is activated to supply steam and compressed air. Steam is fed into the pipe to trigger off the so-called memory effect of the plastic which allows the pipe to expand to its original o-shape. Subsequently, pressurized air is led in to make the pipe close fitting with the inside bore of the existing pipeline. The result is a new structurally self-supporting pipeline inside the old deteriorated pipe.

your benefits

  • Minimum costs and time expenses
  • Pipe diameters from DN 100 to DN 500
  • Quality and expected service life time of rehabilitated pipes equivalent to new pipes
  • Application possible for pipelines which are no longer viable
  • Due to the minimal space requirements, ideal for rehabilitation in inner-city areas