WEATHER SENSITIVITY

LIFT-OUT, LOAD-OUT, FLOAT-OUT AND FLOAT-OVER
The load-out will be a weather sensitive operation; however, it will be performed in relatively protected locations.  Consequently there are unlikely to be significant schedule delays.


SURFACE TOW
The surface tow can be done in relatively rough seas, structure sensitivity permitting.  In most cases the transition to submerged tow will occur before reaching an exposed location.


SUBMERGED TOW
The submerged tow of the SDV and structure is largely unaffected by the surface weather conditions.  The limiting criteria are therefore more likely to be associated with the operational weather limitation of the tow vessel.


The towing operations can be suspended at any time by parking the SDV on the seabed and anchoring it with the tow chain clump weight.

 

INSTALLATION
During installation the SDV motions will be minimal in significant sea states; however, working conditions and ROV operating limits are likely to be the limiting criteria, typically Hs 3.5m.  This compares with a typical limiting sea state of Hs 2.0m for a conventional lifted installation.  In certain areas this may significantly increase the weather window and associated schedule benefits as demonstrated by the following chart.