Nexans Wins Contract to Supply DEH System for Skarv Pipeline
Nexans, the worldwide leader in the cable industry, has been awarded an 11 million Euro contract by BP Norge to supply a direct electrical heating (DEH) system for the Skarv field subsea production pipeline in the Norwegian Sea. Nexans is the only supplier with experience of this unique technology and has already supplied this type of system for 17 subsea pipeline installations. “DEH is a reliable, eco-friendly and cost-effective method of maintaining flow in production pipelines and there is increasing interest in electrical pipeline heating from a variety of companies and projects”, says Patrick Barth, High Voltage Activities Managing Director.
The DEH principle works by sending an electrical alternating current from the FPSO through a dynamic riser cable with two power cores to the seabed and in to the production pipeline. One insulated cable is connected directly to the pipe in the near-end while the other is laid along the pipeline in the direction of the template (far-end) where it is connected to the pipe. AC current is supplied through the cable and returned partly via the pipe walls and partly through the seawater. This causes heat to be generated in the steel pipe which ensures that the well flow is maintained above the critical temperature for hydrate formation.
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