Steel jacket for Mariner field installedNews // September 2, 2015
The steel jacket for the Statoil-operated Mariner field on the UK Continental shelf (UKCS) has now been installed on the seabed.
Following the sailaway from the Dragados Offshore yard in Cadiz, Spain on 10 August, the Mariner jacket recently spent a week in the sheltered Boknafjorden near Stavanger, waiting for the heavy lift vessel Saipem 7000 to arrive at the field.
In the early hours of 30 August Skandi Iceman, towing the S44 barge with the jacket, and the heavy lift vessel were in place, approximately 150km east of Shetland. The operation was assisted by three support tugs and a safety vessel.
During the early hours of 31 August the jacket was hooked up to the cranes, up-ended and placed on its permanent location.
The tug Boulder, towing the Wagenburg 9 barge with the piles, was expected to arrive in the field on 1 September. A total of 24 piles will be driven into the seabed to secure the jacket. Each pile is 65m long with a weight of 250-300 tonnes. The remaining installation activities are expected to continue for another 10-14 days.
134m high and with a footprint of 88 x 62m, the Mariner sub-structure is the largest steel jacket ever built for a Statoil project. The weight at load-out was 22,400 tonnes including floatation tanks and rigging.