Association Technique Maritime et Aéronautique

Numéro : 2557 - Year : 2009

Heavy packages installation for deep offshore

Benjamin ROUSSE, OCEANIDE
François PETRIE, OCEANIDE

 

Deepwater field developments are usually associated with large submarine package to be installed such as suction anchors, manifolds and other subsea equipment. Key data for the lowering operation engineering are the wet weight, added mass and drag coefficients of the package. These hydrodynamic values are not well known particularly for water penetration or close to the seabed. They are usually considered as a constant whereas they are depending on many parameters such as crane motion amplitude and period, package porosity. This lack of data may lead to over-design the lifting equipment and/or to over-restrain the operating environmental conditions. Consequently, this could have a significant impact on the cost & planning of the operation. The CITEPH research project aim is to determine the hydrodynamic coefficients involve in the heavy package offshore installation by the mean of model tests and calculations. Then, offshore heavy lifting operations loads will be more accurately estimated and we will be able to optimise the installations vessels capabilities.

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