New import natural gas pipeline from Russia: crossing of the Tagliamento river concluded
New import natural gas pipeline from Russia:
crossing of the Tagliamento river concluded
The launch of the crossing of the Tagliamento river, in the province of Udine, with the new import natural gas pipeline from Russia, has been successfully completed. The crossing, 600 metres width, involved laying a steel pipeline with a diameter of 1200 mm and a thickness of 18.9 mm. The laying depth guarantees over 9 metres of coverage of the pipeline with respect to the level of the riverbed, in an absolutely safe position.
To guarantee greater mechanical protection of the piping and to eliminate hydrostatic pressure, a concrete coating was added to the launch column, which thus reached an overall weight of over 1,300 tons
The launch was carried out in three successive phases: the column was subdivided into three sections, and the sections were brought to the edge of the excavation one at a time with a set of eight D9 side-booms (pipe-laying lifting gear) and carefully positioned on the sliding trolleys installed on rails. Once the section was welded to the adjacent one, the launch column was pulled into the water by a service winch with a capacity of 50 tons, located on the opposite bank of the river.
During this phase, the column was lightened with the help of 37 buoys, in order to reduce friction with the riverbed and, at the same time, prevent damage to the covering of the pipeline as it dragged along the bottom of the excavation. The buoys were released upon completion of the launch and after an alignment check, thereby allowing the pipeline to fall into its definitive position.
05 August 2016 - 16:35 CEST