Clair Elevational View
Slipner Heavy Lift
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1, Float Over
2, Float Over Engages
3, Float Over Bottoms Out
4, Float Over Engagement Compensation
The Diagram shows the sequence, 1 to 4 of Float Over, Engage and Install. It also shows the way that misalignments are corrected in the
mating. Obviously the main method of completing the operation concerns controlled ballasting. In some circumstances if the support is not a
jacket then the Floater ballasting may be used with the twin barge arrangemt in a static state of floatation.
a general understanding of Modules
2, Spar Delivery, Ballasts Down
3, Spar Float Off
4, Spar Installation Sequence
5, Spar Facts Diagram
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Spar Facts, Notes
The Diagram shows how other activities must be completed before the Topside Module is lifted on. This Diagram shows a Spar a common
platform support in the GOM. Once the Spar is installed ie moored in position then the lift on or Float Over is completed the same as if it were
More detail Facts are given in Clair 5d_5 Drilling as this dominates the design."Offshore Modules
General" concerns more the style of Platform, which is installed by Float Over or Lifting. For
these sort of Installations, the Module as such is the complete Topsides as one piece. Here we
see the Pick Points for Lifting and Loading onto the Jackets. These Lifts are undertaken by Semi
Subs which have Ring Skewing Cranes on each of their stern quarters. The first phase of such
lifts was in fact using Shear Leg Cranes as singles or in combination with lifts up to 6,000 te.
The next phase saw the advent of the Twin Slewing Cranes and figures of 10 - 12,000 te lifts.
Current lifts for Clair Ridge and other installations see the Twin Crane capability raised to 20,000
te as described in Diagram.
These figures are now surpassed by the "Adventurer" which is not a Crane but a twin
hull (ex tankers) in Cateraman Format with Finger Beams which slot in under the platform. All of
these devices can be used to lift or lower using ballasting. The use includes removal which has
gained some importance and such devices are now being used in the decomissioning of
This Diagram shows the structure of the Craft for the Twin
Slewing Crane arrangement to move in Complete Topside
Modules, as Clair. Alternativly the crane can be used to stack the
modules as Boxes. The Jacket top is toped by an MSF, Module
Support Frame and the boxes stacked on accordingly.
Where you see this, Click too View
In 4a General we looked at
the shapes a module may
have to conform with.
In 4a_1, Clair is taken as
the example of a one
piece lift as total Topsides,
an ultra large module.
Clair V's Clair Ridge. Clair was a one off to meet the restraints of
the Clair Project. Low cost to commence field development
allowed the Project to go ahead. Clair Ridge demanded more
Processing capability and similar jacket designs and Topside
apprach were followed but Clair Ridge demanded 2
Platforms/Jackets. Both Projects keep accomodation one end
seperated by Power Generation and away from the Process
Items. The success of Clair paved the way for Clair Ridge, a far
more Field success than Clair alone.