ABERDEEN, UK -- The Sonsub division of Saipem UK has completed the offshore campaign for the Total Frigg sealines cessation plan. The project involved the decommissioning of all sealines within a designated 500-m (1,640-ft) zone.
Sonsub's scope of work comprised the engineering, preparation, removal, and disposal of all infield sealines, power cables, umbilicals, communication lines, grout bags, sand bags and concrete mattresses, saddles, and blocks. Additional scope included rock berm smoothing and general debris clearance.
Following the Normand Cutter offshore campaign, the multipurpose offshore support vessel Far Sovereign completed the recovery of all infield flexible and small diameter rigid lines using a reverse reeling method. The company also recovered four rigid and flexible lines from beneath a large rock dump without the need for complete prior excavation.
Sonsub will continue decommissioning work on the Frigg DP1 platform later this year.