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5. Basic network maintenance
This is the kind of maintenance that sanitation workers have to deal with on a daily basis. They must be able to intervene at any time to clean or unclog the pipes.
5.1 Pipe cleaning
Even a perfectly constructed network needs to be periodically cleaned to remove obstructions and maintain a constant flow of effluent (wastewater, rainwater, etc.). It must be completely cleaned and flushed at least every two years.
In a number of major cities around the world, cleaning teams only intervene when the height of material in 400 mm pipes, for example, reaches 100 mm on the vertical diameter.
Teams are also called in to deal with one-off or general blockages in a pipe: build-up of solid matter following a storm, discarded...
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Basic network maintenance
Rehabilitation / repair / renewal
Bibliography
Software tools
Software developed as part of the "Computer Aided REhabilitation of Sewer Networks" project, downloadable from the CARE-S project website:
Events
Pollutec in Paris every other year and in Lyons every other year.
Ville Sans Tranchée" exhibition organized by FSTT (France Sans Tranchées Technologies)
Standards
- Prescriptions générales pour les composants utilisés pour la rénovation et la réparation des branchements et des réseaux d'assainissement à l'extérieur des bâtiments. - AFNOR – Norme NF EN 13 380 - 2001
- Condition of drainage and sewage systems outside buildings – Part 2: Visual inspection coding system. - NF EN 13508-2 -
Regulatory texts
Arrêté du 22 juin 2007 relative à la collecte, au transport et au traitement des eaux usées des agglomérations d'assainissement ainsi que à la surveillance de leur fonctionnement et de leur efficacité, et aux dispositifs d'assainissement non collectif recevant une charge brute de pollution organique supérieure à 1,2 kg/j de DBO5.
Websites
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SYNCRA (Syndicat national des contrôleurs de réseaux d'assainissement - National union of wastewater network inspectors)
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FSTT (France sans tranchées technologies – formerly Comité français pour les...
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