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USA: MOSS Reviews Permanent Platform Wire Replacement

InterMoor successfully replaced (8) spiral-strand platform wires on a permanent production facility in May 2011 without requiring a platform shutdown or loss of production. The operation was completed using a single Construction Anchor-Handling Vessel (CAHV) at a significant cost savings from the traditional method involving a derrick barge.

Each mooring line consisted of unjacketed spiral-strand wire at the fairlead, two sections of jacketed spiral strand in the water column and studless chain at the seafloor. Syntactic-foam submersible buoys had been installed at each spiral-strand wire connection, so each mooring line had two buoys.

Only the platform wires were to be replaced, and the remaining mooring components including the buoys were to be reused. Protecting the existing components from damage during recovery and reinstallation posed several unique challenges. One of the main operational challenges was to design a way to bring the upper buoy and platform wire out of the water and secure them on deck so that the old platform wire could be disconnected. To accomplish this, InterMoor designed and installed a custom hang-off porch at the CAHV’s stern. The porch used a combination of pneumatic and hydraulic cylinders to manipulate and align the entire porch as each buoy connection was recovered and deployed. The porch also had separate stoppers for the socket connections and a removable cradle for the buoy. Another operational challenge was the unknown condition of the buoys themselves, particularly since they were to be reused on the replacement wires. There was no industry experience at the time in retrieving foam buoys that had remained submerged at depth for over a decade. This paper will explore these challenges and others in more detail as well as the steps that were taken to successfully overcome them.

Subsea World News – USA: MOSS Reviews Permanent Platform Wire Replacement.

Norway: GMC Yard to Modify AMC Connector

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The AMC Connector, the largest and most advanced cable- and pipe-laying vessel for deep ocean operations has arrived to Stavanger, Norway, to undergo modifications. The vessel will be docked at GMC Yard in Buøy outside Stavanger until March 11th 2012.

The 156-meter long multi-purpose vessel, AMC Connector, is an advanced ship with a high cargo capacity, a variety of special equipment and more than 190 kilometres of cable length. GMC Yard will modify the ballast tanks and building sponsoons under the hull. Work to be carried out includes adding a new auxiliary keel, installing a new stabilising tank and a new VLS tower on the vessel.

“The job is shared between GMC Yard, STX in Florø and the ship owner, Aker Marine Contractors. All already have workers on site for the stay in Buøy, says Operations Manager Kjell Olsen of GMC Yard. A total of 200 people are engaged in modifying the AMC Connector in this period.”

GMC Yard has docking capacity for vessels up to 280 meters, and the AMC Connector has no problem fitting into the large Dock 2 at Buøy. The vessel will be used for laying the power cable from land to the Goliath-field in the Barents Sea.

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Norway: Statoil Orders Subsea Structures for Asgard

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Bergen Group Offshore has, through its subsidiary Bergen Group Rosenberg AS, been awarded a contract by Statoil for fabrication of subsea structures for the Åsgard Subsea Compression Project with an estimated value of 50 MNOK.

The project involves delivery of 12 off PLEM structures (Pipeline End Manifold) and one riser base with a total estimated weight of 850 tonnes. The contract includes project management, shop engineering, planning and work preparation,  procurement, fabrication and testing of the structures. The work will commence immediately and final delivery shall take place in May 2013.

The project organization will be mobilized at Buøy, Stavanger where all project activities will be undertaken.

“Bergen Group Rosenberg very pleased to be awarded this contract. We are well positioned for the growing subsea market with our excellent track record for quality deliveries. Through recent investments in fabrication facilities and equipment we shall achieve further improvements in productivity and quality.” says Kristin Færøvik, Executive Vice President of Bergen Group Offshore and CEO of Bergen Group Rosenberg.

Statoil and its partners on Åsgard field have opted for subsea gas compression to help recover the big remaining reserves in this Norwegian Sea field. Subsea compression is expected to increase the recovery factor and producing life of Åsgard. By carrying out compression on the seabed, Asgard partners will achieve benefits in the form of improved energy efficiency and lower costs compared with carrying out compression on platforms or on land.

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