Structural and functional diagnostics of an Industrial Water network

RÉSUMÉ

The Dunkirk Water Syndicate (SED) operates a 60-km industrial water network supplying 16 major industrial users in the Dunkirk area. Commissioned in the 1970s, this network shows a high performance level (97% in 2023) but must now contend with ageing infrastructure and increasing demand.

The study assessed the structural and functional condition of the network in order to anticipate the actions required to ensure its long-term sustainability. It is based on an analysis of the condition of the pipelines (corrosion, fouling) and of the hydraulic behaviour of the system (pressure, transient phenomena, leaks).

The results show widespread fouling, reducing pipe diameter by 15 to 20%, with a limited hydraulic impact. Water-hammer events are, however, frequent—particularly on the West branch—linked to flow-rate variations from industrial users. Internal inspections revealed neither leaks nor air pockets, and the overall condition of the network remains satisfactory thanks to effective cathodic protection and robust monitoring.

The recommendations focus on monitoring ageing sections, controlling transient phenomena, carrying out targeted cleaning operations, and strengthening surveillance to ensure the durability and performance of the network.

Overall, the study highlights the importance of anticipatory management and continuous adaptation of the network, essential to guarantee the safety, performance, and long-term reliability of industrial water supply, while contributing to water-resource preservation and the decarbonisation of the Dunkirk industrial territory.