CIPP systems for potable water pipe rehabilitation differ from non-pressure applications with respect to the liner composition and installation. The design of the installed liner needs to cater for both internal and external pressures and materials used must be approved and certified for contact with drinking water. The CIPP liner can function either as an internal pressure-resistant lining or as a statically self-supporting ‘pipe within the pipe’ based on a fully deteriorated design.
The right solution for every problem
One of the leading manufacturers of CIPP systems is Sekisui NordiTube, a subsidiary of the global SPR Group. Sekisui NordiTube produces two CIPP systems for pressure pipes which cater for highly diverse requirements and have been tried and tested in a broad spectrum of applications worldwide.
Tubetex is a semi-structural liner that has an internal pressure rating up to PN 32 for the rehabilitation of locally deteriorated gas and drinking water pipelines in diameters of 200 to 1,000 mm. Currently lengths of up to several hundred metres can be installed per installation. The basis of Tubetex is a seamlessly circular woven tube made of polyester yarn with a single-sided coating of polyethylene which forms the inside of the liner when installed. The high flexibility of the system allows installation in curves and bends. The liner, impregnated with a thermo-reactive epoxy resin developed by Sekisui NordiTube, is inverted by air pressure out of a mobile pressure drum into the open and previously cleaned pipeline. This method permits long installation lengths and ensures that the tube forms an intimate close fit with the host pipe. The liner is then ready for use after it has been cured, end sealed and reconnected to the distribution system.