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GRTgaz replaces pipelines under the Seine

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World Pipelines,

GRTgaz continues to adapt and modernise its transport network in Normandy with the ‘Traversées de Seine’ project. This consists of replacing two existing gas pipelines with two new ones buried at a greater depth under the Seine between Tancarville (Seine-Maritime) and Marais-Vernier (Eure). This work will enable the Port of Rouen to dredge the river to increase its depth in order to boost the river transport with the passage of more loaded ships and therefore improve the competitiveness of the port. Launched in February 2019 for a period of one year, ‘Traversées sur Seine’ represents the largest project conducted by GRTgaz in the region, with an investment of €11 million.

‘Crossings of the Seine’ is to lay under the Seine two pipes 40 cm in diameter over a total length of 630 m. GRTgaz chose the microtunnel technique: the two pipes, spaced 60 cm apart, will be installed in a single microtunnel. It will be built in the summer of 2019 at more than 7 m deep under the Seine. This work will allow the Grand Port Maritime of Rouen to continue dredging the Seine while ensuring the security of energy supply of the territory. These arteries feed industrial basins of Le Havre and Port-Jérôme.

The site also represents an environmental challenge since it is located in the heart of the Regional Nature Park Boucles de la Seine Normande and on the edge of the National Nature Reserve managed by the House of the Estuary. GRTgaz worked in close consultation with these stakeholders and implemented 27 measures to limit the environmental impact of the project. For example, the work schedule has adapted to the wintering and nesting periods of the birds on the reserve; the life base and the footprint of the microtunnelling areas were installed outside wet meadows and off-reserve. All of these measures are continuously monitored by the territory's environmental partners.

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