ABSTRACT:

With the rise of oil prices, clients are willing to accelerate all the phases of field developments. There is then a natural temptation to choose field-proven solutions that have demonstrated their efficiency and quality in the past. For the Forvie project, TOTAL needed a design capable to handle high operating pressures (520 bar) while providing outstanding thermal performance (U-value better than 0.8W/m2.K). Another key issue for the oil companies (operators) is to open the pipelay competition and increase the chances to find an available vessel. To answer this acute scope of work, ITP proposed a pipe-in-pipe flowline system, combining an original quick field jointing procedure (6 minutes cycle time) with a highly efficient passive insulation (based on a proprietary insulation and offering a compact design). Due to the fieldproven technique (with an actual thermal performance world record of 0.35W/m2.K) and the capacity to mobilize a fabrication yard, ITP was awarded the contract including the engineering, procurement, fabrication and offshore assistance to installation. One year later, the last double joint of the 33km long pipe-in-pipe tie-back was S-laid in the North Sea on time and the field has been onstream since December 2005. The paper will address issues such as the tight planning (1 year from contract award up to offshore installation completion), logistics, welding (double joints with a heavy wall inner pipe), the fabrication process and the offshore installation phase

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