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Rehabilitation of pipes with air and water tightness tests

Pipe rehabilitation involves repairing deteriorated or damaged pipes without the need for masonry and/or excavation work, operating from inside the pipe. This is made possible through modern technologies that allow for accurate video inspections of the pipes to identify and assess any breakage or defect.

The procedure involves the following steps:

1 - Video inspection

Through video inspection, anomalies in the pipe such as cracks, breaks, structural collapses, and obstructions that are not visible from the outside or through line mapping are identified. Video inspection, in general, allows for analyzing the condition of pipes and conduits, enabling the prediction and planning of non-invasive rehabilitation.

2. Rehabilitation

Pipe rehabilitation through repair involves restoring the mechanical and hydraulic functionality of the pipes from the inside, without breaking, excavation, or masonry work. The pipe is lined on the inside with a sheath that can be made of various materials. The thickness of this sheath is studied based on the type of pipe, ensuring it does not reduce the diameter of the drain and restoring hydraulic efficiency while guaranteeing structural solidity. NO-DIG repair executions use the following technologies: packer part-liner, relining, amex joints, sanitube relining.

3. Air or water tightness tests

These tests are conducted at the end of the rehabilitation of a conduit or at the end of the installation of a new conduit (as a test operation). Air or water tightness tests are carried out according to the provisions of the Uni En 1610 standard. The test is performed by placing sealing balloons upstream and downstream of the section to be tested. Pressurization can occur with air or water. The testing times and pressure in air testing are determined based on the testing method and the diameter of the sewer. In water testing, the pressure varies depending on what needs to be tested (only pipes, pipes and manholes, or only manholes). After the tightness test, the customer is issued a "test protocol," stamped and signed, complete with a graph showing the test's progress.


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