Bundles and towed installation

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Bundles and towed installation

BUNDLE FABRICATION

FABRICATIONPROCEDURE

FABRICATION PROCEDURE

ƒ Pre-assemble carrier and pull down site ƒ Weld up flowlines and draw into carrier

Carrier

Winch for pulling carrier down site and then drawing flowline bundle into carrier

Spacer units added

Umbilical components

Fabrication building

Pulling head

Conveyors

NDT and joint coating shed

ƒ Or pre-assemble flowlines ƒ Slip on sections of carrier (field welds) Pipeline welding building

There are two alternatives to the fabrication procedure: Either Fabricate the carrier pipe first Pull the flowlines from the fabrication building into the carrier pipe using a winch Or Fabricate the flowlines first Sleeve the carrier pipe sections over the flowlines and complete the field welds These are followed by: Attachment of the towhead structures at each end of the bundle Hydrotesting and pre-commissioning of the completed bundle onshore, prior to launching

BUNDLEASSEMBLYATTAIN