The project involved the rehabilitation of an existing DN750 sewer main to extend its service life while minimising disruption to the community and surrounding infrastructure.
| Medium | Diameter | Pipe Material | Project Length | Pipe Conditions | Rehabilitation Method |
| Sewer | DN750 (30") | DICL | Over 2,000 m (6,562 ft+) | Aged pipe, corrosion and leaks observed | NORDILINER |
Extending the service life of an aged DN750 sewer main.
Addressing corrosion and leakage observed in the existing host pipe.
Rehabilitating a pipeline located beneath busy streets, bridges, creek crossings, private property and areas near railway infrastructure.
Avoiding open-cut excavation and full pipe replacement.
Managing the risk of surge pressure and water hammer within the sewer system.
Accommodating potential negative pressure conditions caused by pump trips.
Installing the liner through multiple mitred bends without excavating at bend locations.
Completing the works within a limited installation timeframe.
Minimising disruption to the community, traffic and surrounding assets.
Technology: IH (Inserted Hose)
Product: NORDILINER
NORDILINER was selected to rehabilitate the DN750 sewer main. The liner was installed as a flexible inserted hose system and winched through the existing pipeline from one access point to another.
NORDILINER provided a loose-fit lining solution capable of operating under internal pressure. Its flexibility allowed the liner to pass through the existing bends, while the installed system provided protection against further corrosion and leakage of the host pipe. The method also reduced the need for excavation, which was a critical requirement due to the pipeline alignment and surrounding infrastructure.
The project was successfully completed using NordiTube IH Liner technology. The solution provided the following outcomes:
Successful rehabilitation of the DN750 sewer main ensures a minimum design life of 50 years.
Restored the pressure performance of the pipeline using the inserted hose liner system.
Protected the existing host pipe from further corrosion and leakage.
Reduced the need for excavation, avoiding major disruption to traffic, local communities and nearby infrastructure.
Enabled installation beneath busy streets, bridges, creek crossings, private property and railway-adjacent areas.
Successfully navigated large bends without excavation at bend locations.
Maintained the required operating pressure capability of the host pipeline.
Installed through multiple bends in each section.
Reduced construction time and cost compared with open-cut replacement or other relining technology.
Enabled long installation lengths, with the DN750 IH Liner having a maximum achievable single-pull length of up to 550 m.
Required fewer personnel on site, with each section installed by a crew of approximately 5-6 people.
