- Design Review
- Evaluation (technical & commercial) and Support during fabrication / procurement stage
- Structural Installation method development (lifting in air, lifting through splash zone, lifting through water column, landing, overboarding)
- Floatover method development (loose slot, tight slot with fenders, active using jacking system, passive)
- Structural / Lifting analysis and calculation (either simplified or utilizing standard time-domain analytical softwares e.g. OrcaFlex, SIMO, SIMA) to determine operational and weather criteria, including Hs-Tp plot, lifting loads, etc.
- Installation vessel / barge & equipment selection – feasibility, capacity and availability
- Installation procedure development depending on field layout / constraints
- Ballast pump / rapid ballast system requirement
- Interface with specialist subcontractors and fabricators
- Field engineering & operation support
- Survey support
- Cost benefits study and estimation, schedule
.. more on heavy lift and structural installation..
Heavy lift is the core operation of the offshore construction industry. Thousands of heavy lifts are planned to be carried out each year in the open seas (topside structures, modules, bridges, flare towers, etc.). However with just one mistake, catastrophic loss may occur.
Detailed planning and study of the weight, Centre of Gravity (CoG), geometrical dimensions and environmental conditions are essential to ensure sufficient crane capacity, hook height, clearances, rigging sizing and design.
For sensitive module/ subsea structure installation, passive heave compensator can be used to reduce the vertical motion during lifting and landing.
Fit-for-purpose installation aids (eg. Guides and bumpers, cones, bell mouths) are also used to guide the structures to meet the tight installation tolerances and increase workability in rough seas.
With the increased weight of topsides these days (which exceed the lifting capacity of offshore cranes), deck floatover method can be chosen for particular project. This method allows single deck structure to be constructed and mechanically completed onshore to reduce the hook up operations prior to first production of hydrocarbon.