An innovative method known as ‘QUAD’ lifting has been successfully trialed by Heerema Marine Contractors (HMC) in the Gulf of Mexico.
The trial, which took place on 22 October, involved semi-submersible crane vessels Thialf and Balder operating in dynamic positioning mode, using four cranes in parallel.
DNV GL has certified the technology that enables the QUAD lifting process, which will allow engineers greater design freedom in terms of layout in relation to weight and dimensions of topsides and jacket structures, according to HMC. The company also said the method will make it possible for the entirety of a topside structure to be built onshore as a total package during commissioning.
Commenting on the project, HMC chief executive Koos-Jan van Brouwershaven said: “With our QUAD lifting method, we enter a new era with more flexibility and efficiency throughout the entire process – from engineering, procurement and construction up to and including the commissioning and installation of the jacket and/or the topside – with lower project costs as a result.”
Using the technology, HMC plans to offer even greater lifting capacity: “As soon as Sleipnir, the largest semi-submersible crane vessel ever built, is in full operation, we are ready to perform the ultimate QUAD lift, using our two giants with a combined lifting capacity of Thialf’s 14,000 tonnes and Sleipnir’s 20,000 tonnes,” said Mr Van Brouwershaven.
