Rehabilitation of watermains
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Rehabilitation of watermains
Structural lining technology for the trenchless rehabilitation of watermains extends the useful life of the network by installing a liner impregnated with thermosetting resin. This technique helps minimize costs and traffic impacts compared to a traditional replacement method. More specifically, it makes it possible to increase the flow of the network, to restore its structural capacity in addition to resisting corrosion.
Spring 2017:
Foraction inc. becomes the exclusive licensee of CIPP Corporation for Eastern Canada and now works in the field of structural watermain lining by installing the product CIPP H2O©.
Here are the different steps for the trenchless rehabilitation of a watermain using a structural liner:
- A temporary water supply network is installed and the pipe to be lined is located. Access pits are then excavated where required.
- The pipe to be rehabilitated is then cleaned and cleared of all deposits
- A closed-circuit television inspection is carried out in order to confirm the quality of the cleaning as well as to locate the service connections. The liner is then impregnated with resin in the factory and is transported to the site via refrigerated trailer.
- Once on site, the liner is inverted in the host pipe and then cured using steam.
- A hydrostatic pressure test is carried out and the service connections are pierced using a robot.
- Following the disinfection of the pipe, the rehabilitated watermain can be connected to the existing network.
- Access pits are backfilled, the temporary water supply network is dismantled and damaged surfaces are repaired.
Product Technical Information
| Diameters | 150 to 1200 mm (6 to 48 inches) |
|---|---|
| Installation method | Air or water inversion |
| Polymerization method | Circulation of steam or hot water |
| Average installation length | 140 meters |
| Host pipe conditions | Partially or completely deteriorated |
| Standards | Meets or exceeds ASTM F1216 and BNQ 1809-400 |
| Certifications | NSF/ANSI/CAN 61 and BNQ 3660-950 |
| Hazen-Williams coefficient | > 120 |
Here are some of our achievements in watermain rehabilitation:
| Year | City | Street | Length (m) | Diameter (mm) |
|---|---|---|---|---|
| 2018 | Montréal | St-Antoine W. | 925 | 750 |
| 2019 | Rouyn-Noranda | Various | 1176 | 150 to 350 |
| 2019 | Montréal | Various | 1273 | 150 to 200 |
| 2020 | Cornwall | Various | 4017 | 150 to 300 |
| 2020 | Montréal | Maisonneuve E. Blvd | 580 | 750 |