Rehabilitation of existing water mains, gas lines, sewers etc. constructed by steel, cast iron, asbestos cement, reinforced concrete, PVC etc. pipes, deteriorated as a result of corrosion, subsidence, cracking, hydraulic impact, precipitations etc., with inner diameter from 150 mm to 1220 mm, in sections with length (depending on the diameter and other factors) up to 500 m

Complete elimination of leakages.

Increasing the pipeline resistance to earth layers upheaval, vibrations, hydraulic impact.

Improving the hydraulic properties and wear-resistance of the pipeline, due to its smooth inner PE surface and the negligible reduction of cross section

Extending the lifetime of the pipeline by 50 and more years

Structural resistance


Technological process 


The pipeline section, which is to be rehabilitated, is cleaned by a water jet under a high pressure. Rehabilitation is implemented as a hermetic liner is installed on the inner surface of the old pipe. The liner is a flexible seamless pipe, consisting of a reinforcing polyester or glass-fiber layer and a sealing wear-resistant polyethylene layer. Installation is implemented by inversion of the liner, preliminary impregnated by a two-component resin, by means of compressed air. After installation, the liner firmly sticks to the inner surface of the pipe and is cured by pressurized water vapor. Finally, the house connections are restored by means of a robot-cutter.




Video: Rehabilitation of water supply pipeline with high working pressure
The first CIPP rehabilitation in Bulgaria
The project honored with No-Dig Award 2011
Video: Provadia CIPP
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