COMPANY FOCUS COMPANY FOCUS
A2SEA & TEEKAY CORPORATION
The Jacket Installation Vessel (JIV) – a purpose built solution for foundation installation
INTEGRATED INSTALLATION AND SERVICE SOLUTIONS FOR THE OFFSHORE WIND INDUSTRY
Since 2002, A2SEA’s specialist fleet of two semi-jacked vessels and two jack-ups have installed more than 700 turbines and 300 foundations for the world’s offshore wind market.
SEA INSTALLER
Their latest dedicated offshore wind installation vessel is currently under construction. Due for delivery in the final quarter of 2012, the Sea Installer will be key to installing the next generation of offshore foundations and turbines efficiently and safely.
Many of their techniques and processes are setting standards for best practice throughout Offshore Wind, providing solutions that can help bring down the cost per MW of clean energy.
PORTFOLIO
Their project portfolio includes; Horns Rev 1 & 2, Greater Gabbard, Walney, Gunfleet Sands, Thanet, Robin Rigg, Kentish Flats, Burbo Bank, Scroby Sands, London Array, Ormonde, Sheringham Shoal, Baltic I, Arklow Bank, Lillgrunden and soon to be working on Anholt and Teesside.
A2SEA signed an MOU Agreement with Teekay Corporation to design, deliver and operate a new generation of transportation and installation vessels. Able to work on more challenging offshore sites in deeper waters, the new vessels will handle the installation of new types of foundations, such as tripods and jackets, that are likely to be commonplace in Offshore Wind construction.
CO-OPERATION, KNOWLEDGE AND UNIQUE EXPERIENCE
This co-operation is based on A2SEA’s extensive know-how of offshore installation and Teekay’s unique experience of operating large vessels controlled by dynamic positioning (DP). Both companies are planning to jointly develop the floating design through a technical study and subsequently deliver an innovative vessel to the market by 2014.
“A2SEA are committed to developing an innovative vessel design that could cope with the next generation of foundations. Our aim is to provide a cost efficient concept that is unrestricted by factors that the 2nd generation vessels coming onto the market now face such as; water depth, sea bed, etc. We at A2SEA alongside Teekay Corporation believe that we have found the concept that will drive down the cost of foundation installation and will also reduce the installation time”,
says Kaj Lindvig, Chief Sales Officer, A2SEA A/S. “By having a floating installation vessel we are able to carry pre-assembled foundations straight out to site, we are very excited by this venture and the prospect of developing a pioneering foundation installation technique.”
“Our unique experience from shuttle tanker operations and ability to access suitable existing tonnage, paired with A2SEA’s extensive experience from the offshore wind sector, provides the ideal basis to jointly develop an optimized vessel for the installation of offshore wind foundations”, says Stein Rynning, Senior Vice President, Teekay Shuttle Tankers and Offshore. “This will give our customers greater efficiencies, lower costs per unit, and shorter installation times.”
The vessels will be owned and operated by Teekay while A2SEA provides project management and operational expertise.
JIV CONCEPT
The concept involves converting an existing Aframax DP Shuttle Tanker into a Jacket Installation Vessel. They believe that this will reduce the cost of installing jacket foundations.
This is carried out by reducing the installation time as the JIV can take 5-7 jacket foundations in a round trip with no time used to pre-load and jacking, as this is a self propelled floating vessel. The tanker has been built to encounter harsh weather conditions and rough seas and because of this it is robust to tidal variations, and because it is a floating vessel it is not dependant on water depth or sea bed conditions.
“During the design phase, safety has been a very high priority, and this means finding ways of reducing the need to handle components manually. We want as little people intervention with the foundation structures as possible. The seafastening and release equipment will be remotely operated and hydraulic so there is no welding needed, and we also avoid divers and anchors during installation”, explains Ole Jacob Nielsen, Regional Manager A2SEA Ltd. “With so little human intervention on deck, costs are lowered, planning is simpler and safety increases extensively”.
JIV SPECIFICATIONS 48
www.windenergynetwork.co.uk
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