The development of offshore deep water oil & gas fields imposes the related necessity to either upgrade or newly construct floating production units' turrets in which a large number of risers and umbilicals are connected and conveyed through.
Restricted volumes and spaces have therefore to accommodate huge number of piping lines and related equipment.
The severe space congestion can be resolved at a pure design level with 3D modelling capable of optimizing spaces and preventing physical clashes.
This modern design approach may however not take into due account the "constructability" of the installation i.e.
"ease way and efficiency of fabricating, installing and testing the main process piping lines subject to the design and integrity requirements of the installation".
Consequences can be dramatic in terms of schedule, costs, quality of the installation, difficulty of remediating defects or construction errors and eventually even needs for dismantling of already mechanically completed systems in order to allow completion, testing or repair of other systems.
The development of one Constructability study started in parallel with design activities and timely phased in a way as to be effective in providing input to the detailed design, the construction and testing procedures definition and procurements strategies can be the answer to ensure plant integrity as well as respect of schedule and costs.
