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Pipe rehabilitation by working from the inside and testing for air and water tightness

Pipe rehabilitation consists of repairing deteriorated or damaged pipes avoiding masonry and/or excavation work by operating from inside the pipe. This is possible thanks to modern technology that allows accurate video inspections of the pipes and locating and assessing the rupture or defect.

The procedure involves the following steps:

1 - Video inspection

Through video inspection, anomalies in the pipe such as cracks, breaks, structural failures, obstructions that are not visible from the outside or through mapping of the line are identified. In general, video inspection allows the state of preservation of pipes and pipelines to be analysed, so that a non-invasive restoration can be foreseen and planned.

2 - Remediation

Pipeline rehabilitation by repair consists of restoring the mechanical and hydraulic functionality of the pipeline, working from the inside, without ruptures, excavations or masonry work. The pipe is coated on the inside with a sheath, which can be made of various materials. The thickness of this sheath is studied according to the type of pipe so as not to reduce the diameter of the drain and to restore hydraulic efficiency while also guaranteeing the structural solidity of the artefact. NO-DIG repairs using the following technologies: part-liner packer, relining, amex joints, sanitube relining.

3 - Air or water tightness tests

These are carried out at the end of the rehabilitation of a pipeline or at the end of the laying of a new pipeline (as test work); air or water tightness tests are carried out according to the provisions of the Uni En 1610 standard. Testing is carried out by placing obturator balloons, one upstream and one downstream of the section to be tested. The pressurisation can be carried out with air or water. The test time and pressure in air testing is determined depending on the testing method and the diameter of the sewer. In water testing, the pressure varies depending on what is to be tested (pipes only, pipes and manholes or manholes only). After completion of the leak test, a stamped and signed 'test protocol' is issued to the customer, complete with a graph of the test progress.


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