Projects

Riser Analysis

Scope

Cube was engaged to assess the behaviour of the proposed GWF 1 Riser on the Goodwyn jacket. Typically risers on jackets (sub-structures), for the majority of their length, are straight (1 dimensional) and have minimal significant interaction with the supporting jacket. In these cases, the riser can be analysed in an isolated model. For GWF 1, a riser configured in 2 planes through the splash zone was proposed. Consequently, the interaction between jacket and riser was much more significant with the two structures being inter-dependent and influencing each other when loaded.

Also refer to project 029 Clamps.

Outcome

In preference to using very approximate jacket deflections at supports in an AutoPipe riser model, Cube proposed an integrated model including both jacket and riser. Woodside made the SACS jacket model available and Cube modelled the riser into the jacket model for analysis of critical, cyclonic load conditions. By comparing riser deflections, Cube’s assertion of significant interaction between riser and jacket was confirmed. In addition to the accurate modelling and results, the efficiency of using an integrated model to design and check clamps and supporting jacket members was a significant efficiency benefit.

Also refer to project 029 Clamps.

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