Pipeline rehabilitation

Any pipeline rehabilitation process begins with a detailed video inspection of the existing pipeline, to identify the type, extent and location of defects. This preliminary assessment is essential for choosing the right technical solution.

Depending on the situation, robotic equipment such as cutters or milling machines is then used to remove internal obstacles – roots, deposits, corrosion or debris – that could compromise the installation of the liner.

Once the pipeline is prepared, the actual rehabilitation stage is carried out, using one of the following methods:

1. Cured-in-Place Pipe (CIPP) – Steam Method

This method involves impregnating a flexible textile liner with a thermosetting resin. The liner is then inserted into the pipeline using an inverter, which uses air pressure to twist and push it into position. Once positioned, the liner is steam cured using a temperature-controlled curing unit. This technique is ideal for gravity applications, with the advantage of rapid installation and adaptability to a variety of diameters.

2. Cured-in-Place Pipe (CIPP) – UV Method

A modern alternative to the thermal method is the use of ultraviolet (UV) light for curing. The liner is pre-impregnated with a photo-reactive resin, drawn into the host pipe, and then cured using a train of UV lamps running the entire length of the pipe. This process is fast, clean and efficient, offering excellent control over the quality of the cure and is suitable for urban projects or temperature-sensitive environments.

3. SIPP – Spray-In-Place Pipe

SIPP is a method that involves the internal spraying of a layer of resin directly onto the pipe wall. A robot or mechanized arm is used to evenly apply the material inside the pipe, forming a new, waterproof and durable protective layer. This solution is particularly suitable for pipes with large diameters or irregular shapes and offers rapid rehabilitation, with minimal impact on traffic or the environment.

4. Pipe-in-Liner

For the rehabilitation of pipes under pressure (drinking water, industrial water, fire networks, etc.), Pipe-in-Liner technology is used, a system consisting of a flexible reinforced tube made of high-strength plastic materials. This liner is mechanically pulled into the existing pipe, without the need for resin impregnation or a hardening process. It offers a robust structural solution with long service life and minimal downtime.

5. Fold & Form (FFPP)

The Fold & Form method involves inserting a thermoformed liner made of modified PVC, supplied in a folded form (C or H), which is pulled into the host pipe. The liner is then heated with steam, which causes it to resume its cylindrical shape and tightly fit the inside of the pipe. After cooling, a continuous, seamless internal pipe is obtained, with excellent mechanical properties and corrosion resistance.