Contractors
The environmental impact assessment was carried out by Rambøll and Environmental Resource Management. The route and seabed surveys were conducted by Marin Mätteknik, IfAÖ, PeterGaz and DOF Subsea.
Work preliminary front-end engineering was done by Intec Engineering. The design engineering of the subsea pipeline was done by Snamprogetti (now part of Saipem) and the pipeline was constructed by Saipem. Saipem gave sub-contract to Allseas for laying more than 1/4 of both the pipelines. The seabed was prepared for the laying of the pipeline by a joint venture of Royal Boskalis Westminster and Tideway. The pipes were provided by EUROPIPE, OMK, and Sumitomo. Concrete weight coating and logistics services were provided by EUPEC PipeCoatings S.A. For the concrete weight coating new coating plants were constructed in Mukran (Germany) and Kotka (Finland). Rolls-Royce plc supplied eight industrial aeroderivative gas turbines driving centrifugal compressors for front-end gas boosting at the Vyborg (Portovaya) gas compressor station. Dresser-Rand Group supplied DATUM compressors and Siirtec Nigi SPA provided a gas treatment unit for the Portovaya station.
For the construction period, Nord Stream AG created a logistic center in Gotland. Other interim stock yards are located in Mukran, in Kotka, in Hanko (Finland) and in Karlshamn (Sweden).
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