Kværner John Brown – UK Nov ’94 – Sep ’95

Chevron Conoco Britannia Jacket

I worked as senior structural engineer responsible for the grounded loadout analysis and flexible barge transportation analysis of the 20700T launched jacket. The barge was modelled to get the correct load distribution at the support points.I also did the design of ring stiffened joints for temporary and operational conditions and the sea fastening design.

The eight-legged tubular-framed jacket supports the topsides of 11000T, risers and caissons, and is located over the ten-slot well template, which was installed in 1995. Large mudmats were required to support the substructure’s 20,700t weight, while the 20 foundation piles were driven 105m into the seabed using underwater hammers. At 123m in length (400ft) and 2.74m (9ft) in diameter, these are the largest piles in the history of the North Sea. The jacket is 158m tall and its base is 78x70m.