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Transocean

Sedco 702 (MODU) Repair and Upgrade Works

ICON was commissioned to project manage and execute several projects on the Sedco 702 rig. These included repair of vessel impact damage to a stability column and replacement of a chain locker lining.

In each case, the work involved preparation of the repair procedures, procurement of materials, prefabrication, execution of the repair work offshore and preparation of ‘as built’ documentation for submission to the classifying authority American Bureau of Shipping.

Lifting prefabricated scaffolding onto the Sedco 702.jpg

Lifting prefabricated scaffolding aboard the Sedco 702

 

Repair of vessel impact damage

The work involved preparation of the repair procedure, procurement of hull materials, prefabrication, execution of the repair work offshore whilst the rig was in Dampier and preparation of as built documentation for submission to the classifying authority American Bureau of Shipping.

The work required a patch approximately 4m square to be cut from the column and replaced with a prefabricated patch. A key feature of the work was the prefabricated scaffold which was assembled onshore and brought out in a single piece.

This allowed work to be carried out on the opening immediately the damaged shell section had been cut away. The scaffold was designed to allow the new patch to be lowered into place between the scaffold and the column.

ICON provided a supervisor and a team of personnel for the project. Some services such as crane operations and painting were carried out by the rig. The ICON team worked with the rig crew to ensure that the project was executed efficiently and within the required time frame.

Replacement of Chain Locker on the Sedco 702 MODU, 1999

ICON was commissioned by Sedco to replace a chain locker on the Sedco 702 MODU. The work involved preparation of the procedure, material procurement, prefabrication of the locker segments and execution of the work offshore.

The work was particularly arduous as the working conditions were cramped within the highly segmented column. Strict procedures for working in confined spaces were adhered to for the job.

The work was performed whilst the rig was under tow from Bass Strait to the North West Shelf. An essential part of the work was the planning and logistics which had all equipment and materials loaded on the rig prior to departure.

This allowed the work to be progressed with minimal external support. The job was completed in the required time frame in a safe manner with no injuries.

A key feature of the job was the planning to allow for the removal of the old sections and installation of the new sections within the highly stiffened column. This required access hatches to be cut and a transfer system to be set up to allow the sections to be moved in and out of the chain locker.

Sedco 702 chain locker rig mods.jpg

Chain locker rig modifications on the Sedco 702
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