The lining rehabilitation method, in terms of current technology, is the most qualitative method of reconditioning pressure pipelines and gravity flow pipelines.

Most pipeline networks (gas, water, sewerage, technologycal networks for thermo agent transportation) are already aging and increasingly more often leaks occur, and from safety and economical reasons these pipelines should be quickly restored. In the recent years, for reconditioning such pipelines, No-Dig technologies have been requested increasingly more often, as these technologies do not require open excavation.

This technology has its roots in Japan where they sought a technical solution for avoiding leakage from pipelines damaged by frequent earthquakes in the respective area.

In a very short period of time this technology has developed and today it is one of the most efficient method for the rehabilitation of gas, petrol, drinking water, waste water, and chemical industry specific pipelines.

The method presented here consists of inserting a composite tube into the pipeline which is being rehabilitated. Before placing the composite tube into the host pipe, it is impregnated with a reactive resin depending on the destination chosen for the pipe. After being inserted into the pipe, the impregnated resin will be polymerized, thus obtaining a new pipe with special qualities.

This advanced method is applicable to pipelines with nominal diameters between 100 and 2000 mm, with lengths up to 600 m. Using the relining technology (with liner), various gas, oil, drinking water, waste water, and chemical industry pipelines can be rehabilitated.

Liners approved for drinking water are available as well, in conformity with the standards required by form DVGW – Arbeitsblatt W 270.

Main technological stages:

  • Preliminary inspection (cctv), cleaning, flow bypass operations, and pre-installation video inspection
  • Laying the lining material through: pull-in, air pressure inversion or inversion with water column pressure
  • Polymerization by: heat treatment with steam or hot water, UV treatment, special resins or air pressure treatment
  • Recommissioning the pipeline, opening and rehabilitation of connections, post-installation video inspection

The method allows going through curves of 45 ° in the case of:

  • Drinking water pipelines
  • Gas pipelines
  • Petrol products transporting pipelines
  • Pressurized waste water pipelines
  • Chemical industry pipelines
  • Gravity flow pipelines