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MAIN FEATURE


to support quality assurance schemes. Used in isolation they are not QA schemes as such, but can be used for confirmation at various stages for example: fromthe selection of raw materials; throughmanufacture and installation; and during use to confirm product performance during its expected lifetime.


Responsibility for QA lieswith all stakeholders including:materialmanufacturers, system manufacturers, their agent/suppliers in each country, the contractors and their sub- contractors, the sewer network owners (across the departments involved e.g., investment, design, procurement and delivery) and their consultants/framework partners. Public and private sector ‘expert’ organisationsworking on behalf of stakeholders support themby providing guidance and standards that can be followed (e.g., trade associations, national and international standards bodies and research organisations).


The exact QA requirements differ between the technologies and products available, but the following aspects for CIPP lining, generally apply:


■ Awareness by stakeholders of relevant standards and guidance


■ Quality of the rawmaterials (e.g. resins, felts) - factory QA processes to ensure


consistent quality, testing of batches, record keeping, appropriate environmental conditions for storage, awareness of shelf-life expiry.


■ Storage and transport ofmaterials and products throughout the distribution


chain - adherence to environmental conditions for storage, awareness of shelf-life.


■ Quality of the system- evidence of performance against relevant


performance and testing standards. Fitness for purpose of the installation manual.


■ Correct selection of an appropriate technique for each situation according to


characteristics of the host pipe, damage scenarios, external loading, etc.


■ Correct design – for off the shelf products, checking the stated design


against the application. For bespoke designs checking the requirements are met during procurement and installation.


■ Selection of suitably qualified/ experienced installer.


■ Inclusion by the customer of necessary QA requirements into tender documents


and ensuring these are effectively considered at tender evaluation.


■ Use of installationmanual.


■ Training and experience of installation team.


■ Preparation/cleaning of host pipe according to systemsuppliers pre-


installation requirements.


■ Preparation of product on site – checking that thematerials/products are those


thatwere specified, checking for damage and shelf life expiry, accurate measurement andmixing of components, andwetting out linerwith of resin.


■ Installation - appropriate environmental conditions, equipment checks,


management of curing, adherence to installationmanual.


■ Onsite supervision - by suitably qualified staff fromthe supplier, contractor,


customer, their agent, or a third party.


■ Preparation of post installation samples for testing that are representative of the


installation, appropriate chain of custody for samples, correct packaging, labelling and storage.


■ Post installation inspection – visual, pressure testing, assessment of


serviceability, laboratory evaluation of samples against expected performance.


■ Inspection/testing at the end of a Warranty period.


10


| February 2021 | www.draintraderltd.com


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