CIPP, From the magazine, Rehabilitation

Next generation CIPP lining system sets new benchmark

The iPlus Infusion lining system is part of Insituform’s next generation lining range and was especially developed for the 150 mm – 300 mm diameter sewer and stormwater market.

The pull-in process

While the system produces a well proven high quality cured-in-place-pipe (CIPP) liner, the innovation lies in the installation process. The liner is installed using a pull-in process, coupled with air inflation and steam curing. In order to achieve this, Insituform’s significant R&D department had to work closely with its liner manufacturing plant to develop the system over a period of five years.

The development process involved the design of a state-of-the-art liner impregnation or wet out system which is unlike any traditional wet out system previously seen. The iPlus Infusion wet out “÷tower’ results in faster liner impregnation with greater quality control. It also allows for long liner lengths to be prepared in the factory and cut to length on site.

Most important to the installation process is the ability to reduce the pull-in load on the liner during installation. This is achieved by the use of a thin, light-weight sacrificial material which sits behind the under-side of the liner. This material not only protects the liner during pull-in, but it carries the tensile load during the pull-in process which means that the liner experiences almost no stress during installation.

The iPlus Infusion liner produces all the recognised benefits of other Insituform CIPP liners. These benefits include a tight fit liner against the host pipe eliminating infiltration into the lined pipe and a joint-free continuous liner from start to finish, preventing the entry of roots. The fully structural pipe is designed in accordance with AS/NZS2566.1 incorporating a smooth, thin liner with improved hydraulics to increase flow capacity through the lined pipe.

iPlus Infusion: improving the CIPP lining

The iPlus Infusion system further enhances the above properties thanks to the construction of the liner and installation method. The most critical improvement comes in the form of enhanced leak tightness. The system was developed to meet rigorous German long-term leak tightness tests and has set the benchmark for lining systems around the world.

Australian clients now have access to world class technology which was previously only available in leading European and North American markets. The iPlus Infusion system is also easily and efficiently installed so that it is economically competitive against other close fit lining systems on the market.

The combination of installation method and steam curing process means that very long liner lengths can be quickly installed without bypassing flow in most instances. Insituform Pacific commonly installs liners in excess of 200 m in length in a single operation within a two hour window. Since introducing the new lining system to Australia eight months ago, Insituform Pacific has already installed over 12,000 m of liners throughout New South Wales and Queensland as clients begin to appreciate the benefits offered by the system.

These installation efficiencies help to make this superior lining system competitive in all circumstances as well as minimising impact on residents.

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