Load-out of self-propelled jack-up unit ‘Vahana Aryan’, UAE
ALE has successfully transported and loaded-out a Self-Propelled Self-Elevating Mobile Offshore Unit (SPSEMOU), weighing 5,800t, at Eversendai Offshore’s Fabrication yard in Ras Al Khaimah, UAE. The SPSEMOU was then jacked-up on location by the vessel owners, Vahana Offshore.
ALE used 204 axle lines of SPMT in a configuration of 6 x 2 file 34 to perform the transportation and load-out of the SPSEMOU. After the load-out, the SPSEMOU’s legs were lowered onto the seabed. Then, on a falling tide, ALE simultaneously ballasted the barge, while the owners adjusted the hull level, allowing the SPSEMOU to be clear from the SPMTs and be self-supporting. At this point it was elevated to be fully supported on its legs and clear of the SPMTs.
The SPMTs were removed from the barge so it could be removed from under the SPSEMOU. The barge was later moved out, adopting a winching operation.
The load-out operation was fully controlled by ALE using deck-mounted movable ballast pumps on-board a class 330+ barge.
One of the challenges ALE faced was obtaining a suitable barge with a narrow deck, yet large enough ballast capacity suitable for the heavy weights involved.
The barge selected had a limited clearance of just 140mm between the SPSEMOU legs’ spud cans and the side of the barge, which meant that the accuracy of trailer locations needed to be strictly controlled. Additionally, the removal of the barge via a winching operation was carried out with extremely tight dimensional control. Good project management, seamless cooperation with owners and adherence to procedures ensured the successful outcome.
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