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MAIN FEATURE


rehabilitation using CIPP liners in its testing achievements but the organisation does realise that trenchless in all its forms, such as HDD and CCTV have different requirements. However, some ofwhat follows is quite generic.


There are several aspects of testingwork that need to be considered and for IKT this list generally centres round the following:


■ QA considerations and responsibilities and howtesting is one of the tools that


can be used to support a QA system


■ Why there is a need to knowthe performance of liners to support design


including differences between using an off-the-shelf and a bespoke liner


■ The hierarchy of performance and testing standards fromthe company


level to ISOs


■ The roles of tests andwhen they can be applied


■ Howapprovals/certifications fit into the mix andwhy end users should read the


small print ■ Other aspects of performance evaluation


Whilst this section does not separately list all of IKTs capabilities, those that are highlighted are activities that are appropriate and relevant to the industry in question.


QA, TESTING, APPROVALS/ CERTIFICATION


As an operator installs newpipe and rejects any damaged components, they aremaking a


6


final decision in a quality assurance decision making process that startedwith production and continued through storage and delivery to site. But,with trenchless rehabilitation the ‘new’ pipe is only created at the actual moment in timewhere the curing process ends and that is underground, out of sight andwith no possibility of easily inspecting what has been produced. Consequently, adherence to quality control before and during installation and then undertaking post- installation checks is essential. Testing and approvals/certifications are tools that support such quality assurancemeasures.


Studies have consistently shown that observed defects in trenchless rehabilitation


| February 2021 | www.draintraderltd.com


can often be related back to installation issues. These include inadequate preparation/ cleaning of the host pipe, inadequate preparation of the liner system(e.g.wetting out), installation issues (e.g. folds, lack of adhesion) and incorrect curing. Such defects can be avoided by correct application of quality controlmeasures before and during installation. Post installation defects arise as a consequence of inadequate design/selection of the systemfor the task, cleaning and maintenance practices (e.g., high pressure water jet cleaning) and unforeseen impacts, such as changes in soil/pipe loading (e.g. from traffic above) or fromdevelopment of aggressive conditionswithin the pipe. These


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