FAQ - Risanamento Fognature

Simple, just consider the additional costs and other problems that are present when replacing old pipes with new pipes:

• excavation and demolition of asphalt or paving, even precious (town centers)
• damage to sidewalks, driveways, landscape
• Significant costs of restoration after excavation and replacement of the old pipe
• use of time for the excavation, with the unexpected discovery of other providing lines
• disposal of various materials, sometimes special waste (special dump is needed)
• pollution arising from mining operations (dust, noise, vibrations …)
• congestion or traffic delays

When using the technique of re-lining and other trenchless technologies, all of the problems listed above are not present or are limited to a minimum.

Anyone can be interested in the re-lining as a technique for low environmental impact to rehabilitate old pipes.
Some examples are: municipalities and municipal companies, home areas, hospitals, industrial sites, factories and thermal power plants.

The Liner has been extensively tested over the years and is currently certified for a period of at least 50 years!

Yes, the liner pipe is a stand-alone pipe and repairs cracks and missing sections of pipe located in the tube. The inner Liner has proven structural properties and can withstand alone under road loads, soil and to the pressure of the ground water, such as a new plastic pipe.

Virtually all types: PVC, HDPE, cast iron, metal, concrete and fiber reinforced concrete, are all suitable for the non-destructive repair with Liner.

Yes! Pipeliner coating significantly reduces waste to landfill compared to traditional methods of excavation and replacement. The waste materials from demolition operations are limited to a minimum.
In addition, when applied to industrial sites, the Pipelining technique does not need to solve the problems of expensive soil remediation because the digging is not necessary.

Although every job is unique and may require completion in successive steps which varies from case to case, a standard installation of a Liner lasts about 6-8 hours.

Of course it is! The Liner can be positioned and installed around most bends, changes in direction of the pipe, section changes, intersections of connections and joints.

Usually from a diameter of 100 mm to a diameter of 1500 mm.
Different sizes can be made, upon request, with various technologies.

Before doing any re-lining process, an inspection is performed and recorded by special television cameras (CCTV) in order to acquire information about the real situation of the existing pipe, to identify specific problems, detect bends, connections, section changes, position of manholes, …
After the re-lining process, CCTV inspection is performed in order to check the tube just coated with the Liner, as evidence that all work has been completed.
If required, we can provide pressure and sealing testing in accordance with the Standards in force.

No. The overall diameter of the tube is decreased by an average of 6 – 8 mm.
This is not sufficient to change the flow rate required of the tube. Indeed, after the re-lining the inner surface of the tube becomes smoother by increasing the flow rate and the capacity of self-cleaning.

No when compared to the cost of excavation, pipe replacement, landfill and restoration of the surrounding area; the re-lining is both economically and ecologically.

Yes. It’s possible to install a single gasket to fix the joint in large diameter pipes.
We can do a part-liner instead to repair a failed joint in small diameter pipes.

Re-lining system for trenchless pipe rehabilitation, has been used for at least 25 years throughout Europe and the United States.
The Liner, its materials and technology have always been subject to continuous improvement of strength, quality, lifetime and rapid installation.

Yes. The inner Liner has proven structural properties and can withstand under road loads, soil and to the pressure of the ground water, such as a new plastic pipe.

Structural analysis and FEM analysis can be provided upon request for each job and each application of the tube.

However, prior to each installation we calculate the Liner to withstand the design loads and pressures.

Sì. Yes. It is possible to rehabilitate gas pipes with special re-lining techniques.

Yes. It’s possible to rehabilitate pipes with internal water pressure up to 10 bar and more.
We are able to take, upon request, the right technique for each application and pressure.

The terminology used very often derive from the English language and can be summarized as follows.
Liner: continuous inner coating (of a pipe)
Part-liner: internal coating of a tube section
Pipe-lining: inner lining process of a pipe
CIPP: Cured In Place Pipe
No-Dig: without excavation
Trenchless: without trench
CCTV inspection: closed-circuit television inspection
Rehabilitation: restoration
Re-Lining: rehabilitation by liner