Application of HFI-pipes for a pipe-in-pipe system in the North Sea
Nov 22, 2007
The gas field Forvie North is located in the North Sea between the Shetland Islands and Norway. In this area the water depth is approx. 118 m. The gas reserve itself is located in a depth of approx. 4 km under the seabed. From here the gas is transported with approximately 95 °C. The North Sea is very cold in this area and in order to avoid the establishment of hydrates, the temperature of the transported material must be kept high. Therefore pipe systems with a high thermal insulation have to be used. The heat conduction coefficient may be max. 1 W/m2K. This value can only be achieved by special insulated pipes as a pipe-in-pipe system.
Especially for the Forvie project experience from previous offshore projects with the pipe-inpipe manufacturer ITP were helpful. Special design requirements from Total and ITP demanded the production of the non-standard diameter 443.0 mm, which is one of the several possible non-standard diameters from Mannesmann Fuchs Rohr. The inserting of the seamless pipes and the thermal isolation required narrow pipe tolerances over the entire pipe length and even smaller tolerances of the inner diameters at the pipe ends. The straightness of the pipes with maximum 0.15 % enables an accurate inserting of the inner pipe. Furthermore HFIpipes in the non-standard outer diameters 477.0 and 510.0 mm were provided as so called sleeve pipes in fix length tolerance.
Upon request Mannesmann Fuchs Rohr can supply pipes with various coating systems as 3 layer PE or PP coating (MAPEC), concrete coating, epoxy lining and cement mortar lining. Additionally to these coating systems Mannesmann Fuchs Rohr offers various types of rough coating. Within the here presented project a white PP-rough coating was demanded (Fig 3).
 Löbbe, H.: HFI goes Offshore – The Influence of Welding Frequency in Production of Thick-Walled HFI Pipe. Tube & Pipe Technologyy Sep./Okt. 2005, pp. 148-151
 Löbbe, H.; Zimmermann, B.: Qualitätssicherung von HFI-Rohren. 3R international (43) 3/2004, pp. 180-184
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