Bundles and towed installation

Bundles and towed installation

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INTERMEDIATE STRUCTURES

Intermediate structures can be incorporated within a bundle for future tie-ins. The above slide shows the intermediate structure in the Britannia bundle during launching with its integrated protection structure in place.

INTEGRATEDDYNAMICRISERS

INTEGRATED DYNAMIC RISERS

FPSO turret

Mid-water arch buoyancy units

Risers

Tether

Elevation – installed risers

Towhead structure

Buoyancy units

45 m (150 ft)

45 m (150 ft)

50 m (165 ft)

Plan – tow-out storage position

By connecting flexible dynamic risers to flowline bundle towhead structures prior to transportation to the field, significant cost savings can be achieved. Riser connections can be made onshore, eliminating the need for subsea activity and DSVs Steep riser configurations can be used if the towhead structure is utilised as a riser/tether gravity base, resulting in reduced lengths of flexible risers