Rehabilitation of an Outdated Collector Sewer Under Demanding Conditions

Last year, the Jennersdorf District Wastewater Association discovered issues within the local sewage network, necessitating complex rehabilitation. Given the challenging topography and space constraints, only a top-tier wastewater pipe system was suitable for the project. The PP Master multilayer sewer pipes from Pipelife Austria's portfolio, renowned for their reliability and advanced engineering, were chosen to overcome the installation challenges.

_{Major Defects Undermine Safe Wastewater Disposal}

In autumn 2023, a camera inspection of a sewage system in the district of Jennersdorf, Austria, revealed significant defects over a 30 km section of the existing pipe network. The identified issues included significant subsidence, deposits in pipes, leaks, and a mix of materials used, including asbestos cement, which no longer met modern safety and quality standards.

To restore safe and efficient wastewater disposal, the Jennersdorf District Wastewater Association prioritized renovating a critical 870-meter sewer network section using the open trench method.

_{Working Amid Challenging Installation Conditions} 

The Association collaborated with the planning office Lugitsch & Partner Jennersdorf to devise an optimal solution for the project. Calculations from the planning office, alongside the challenging terrain conditions in the area, indicated that only a multilayer pipe system with a stiffness class of at least SN 12 would be a suitable replacement option.

The outdated pipes had been installed along a natural watercourse, necessitating the clearing of banks before laying work could begin. Additionally, an adjacent country road ran very close to the pipeline in some areas, leading to tight space conditions and complicating the digging and laying of trenches that had to be up to 4 meters deep.

Special care was also required to remove old pipe parts containing asbestos — these were collected in a sealed container and transported away as hazardous waste.

_{PP Master: Wastewater Pipe System That Ticks All Boxes}

To address the project's numerous challenges, the contracted construction company PORR opted for the PP Master multilayer pipes from Pipelife. The 3-layer polypropylene pipes not only meet current construction standards and requirements but also stand out for their high performance and durability. 

Each of the pipe's layers has been designed to address specific needs: the hard outer layer is highly abrasion and impact-resistant, the core layer ensures high ring stiffness and longitudinal rigidity, while the light-colored, ultra-smooth inner layer has excellent flow properties and facilitates camera inspections. 

Another unique feature of PP Master is the internal marking of the pipes, enabling precise inspection even after installation. The red support ring adds extra safety by preventing the sealing ring from being unintentionally pushed out during installation. 

The system's outstanding technical properties and wide range of complementary fittings make it suitable for even the most demanding installation scenarios, including low cover depth or groundwater impacts. 

_{Smooth Installation Through Well-Established Cooperation}

The installation of the new pipeline in Jennersdorf began in March 2024. A total of 745 meters of PP Master in DN 250 and 135 meters in DN 300 were used for sewer rehabilitation. All products were delivered to the construction site directly from Pipelife Austria's warehouse in Krems.

Despite the installation challenges, the sewer rehabilitation was completed on schedule in June 2024. The collaboration between all involved parties was seamless, as confirmed by engineer Robert Schuster, Site Manager at PORR: 

"We have worked with Pipelife on several projects before and will continue to do so in the future. The individual approach and competence of Pipelife's field service representatives, along with the outstanding product quality, distinguish our collaboration."