3D model of the platform

Model after construction

Highly effi cient Tension Leg Platform design, testing and analysis

MARIN tested Hess’ Stampede Tension Leg

Platform (TLP) in the Offshore Basin in waves, wind and

current in 2014. A thorough, 30-day test programme was put together in close cooperation with HESS, its contractor MODEC and MARIN.

Jorrit-Jan Serraris & Robert Heerink,


ARIN continuously optimises its modelling, testing and data analysis approaches in order to

provide clients with efficient, highly accurate results. This article describes how a detailed TLP model is created with the aid of 3D computer modelling, how an extensive set of environmental conditions is calibrated efficiently and how the use of high-speed video recordings provides detailed insight into the impact of high and breaking waves on a platform. Finally, all the measured data was analysed and delivered directly after each test thanks to a detailed data analysis plan put together before the project got underway.

Model design Every project at MARIN starts with a CAD design of the vessel or platform. Nowadays, it is usual to make 3D CAD designs of the complete model, including

detailed appendages on the hull and internal structural members. This approach gives the advantage that the displacement can be checked and the weight distribution of the model is known before manufacturing. For TLPs and semi submersibles, the weight distribution can be challenging to realise at model scale. The 3D CAD model assists the engineers to optimise the model design in order to realise the correct weight distribution of the platform. Additionally, this approach means that the model manufacturing is very efficient. In a similar way to a shipyard, all plates and elements are pre-cut and delivered to the assembly place, in this case MARIN’s model manufacturing workshop. All the pre-cut plates are assembled like a building package.

Environmental modelling An extensive set of more than 150 waves was calibrated,

report 9


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