ABSTRACT
The state of the art for weather window estimation under uncertain met-ocean conditions offshore is application of the alpha-factor method in (DNV, 2011). The standard method is limited to use of simple met-ocean parameters such as wind speed and wave height, as indicators of whether the operation is safe to attempt, see section 3.4 and (DNV, 2011) for more details. However, the operational limiting factors are inherently physical-closely linked to physical properties and responses of the installation equipment and vessels, such as strength of liting cables, maximum alowable accelerations, motions and velocities of vessels and lifted components, etc.
