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MAIN FEATURE


can bemitigated through the design/ selection processes andmonitored for during the product’s lifetime.


So,what is expected of a pipe rehabilitation operation?When a Cured-In-Place-Pipe (CIPP) liner or other formof rehabilitation is installed for the purpose of renewing a deteriorated pipe, the asset owner has expectations that it will performin amanner similar to that of a newpipe. Thismeans that the rehabilitation technology shouldmeet the following performance requirements:


■ Have a known set ofmaterial properties ■ Have aminimumexpected life ■ Not suffer any premature failure ■ Not contain any defects


By comparison,when a newpipe line is laid, the product is supplied readymade by a pipe manufacturer, the quality of the pipes are tightly controlledwithin the factory environment and any damaged/defective lengths can also be rejected at delivery to site or at installation. This affords a high degree of quality control for the installed pipe and the asset owner can reasonably expect all of the above performance expectations to bemet in that case. However, particular care still has to be takenwith jointing during installation.


With rehabilitation technologies,where effectively a newpipe ismanufacturedwithin


8


the host on the day of installation, the actual qualities of the ‘new’ pipe are a function of the installation process and quality of the materials at the time of installation. Thus, whilst production of the felt, resin and other componentsmay be individually quality assured at the factory, the quality of the finished ‘pipe’ is dependent on choice of material, liner preparation (particularly impregnation of the feltwith resin), preparation of the host pipe, and, on the day, the skill of the installer in undertaking the correct procedures, particularly the curing process. This can only be checked if, following installation, an adequate set of tests are performed to ensure that the performance expectations for the product are satisfied.


| February 2021 | www.draintraderltd.com


Why test for structural performance? Structural performance needs to be assessed for liners to provide data for design calculations. The designed thickness of a CIPP liner is determined by the structural requirements and the properties of the selectedmaterials.When performing the structural design severalworse case assumptions aremade. These include:


■ That the host pipe is fully deteriorated (i.e., has no load carrying capacity)


■ The liner receives all loads simultaneously and at themaximum


values, i.e., the potential traffic, soil and hydrostatic loadings


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