In 2006 HFG’s Vlissingen fabrication facility was awarded the contract for the Procurement and Construction of the tower base template and foundation piles for the Tombua Landana platform by Daewoo.
DSME, main contractor for the construction of the complete platform, together with Chevron choose Heerema Vlissingen due to the stringent dimensional requirements. The template has been built with a tolerance of only 3 millimetres between the cylinders, where the piles have to be driven into the seabed. This meant a tremendous accuracy during construction. The operator of the Tombua Landana platform is Cabinda Gulf Oil Co. Ltd., a subsidiary of Chevron.
Construction work for the fabrication of the tower base template and the twelve piles for the Tombua Landana platform started at the Heerema Vlissingen yard in July 2006. The extreme tight tolerances, any dimension within 3mm, in combination with plate and tubular properties (up to 100mm) required accurate preparation in combining fabrication sequence and welding engineering.
Twelve immense long (190 meters) foundation piles were driven through the template which went down almost two hundred meters into the sea bed and weigh a total of 9,800 tons.