CABLE INSTALLATION VESSELS FEATURE
CABLE INSTALLATION VESSELS FEATURE
WORLD’S LONGEST POWER LINK TO AN OFFSHORE PLATFORM
INSTALLATION CABLE FOR STATOIL GJØA FLOATING PLATFORM IN NORTH SEA
Gjøa is the first ever floating platform to have power supplied by a direct link from the shore, which contributes to a greener source of energy. The platform is connected to the Norwegian grid, reduces carbon emissions by an estimated 210,000 tonnes a year and minimises its reliance on integral fossil fuel generators.
COLLABORATION
Global Marine Systems and ABB worked together to install the subsea cable which brings electricity from the Mongstad refinery, north of Bergen, Norway, to the floating production platform in the North Sea.
The cable installation work was completed using the Cable Lay Ship NorthOcean 102. From early 2009 as an offshore construction vessel, the ship was taken on charter and converted into a cable lay vessel specifically for the purposes of the Gjøa project.
EQUIPMENT SPECIFICATIONS This major conversion work included installation of a 7,000 tonne capacity horizontal reel carousel system and associated cable lay spread equipment. Two independent QUATUM work class remotely operated vehicles (ROVs) were also used on board the NorthOcean102 to meet the requirement for continuous Touch Down Monitoring (TDM) of the lay cable.
Supplied by MODUS Ltd, these next- generation ROVs are designed for precision subsea intervention and heavy duty applications.
THE PROCESS AND THE CHALLENGE The cable installation process needed to be precisely controlled to mitigate the anticipated weather conditions in the North Sea, where waves can exceed seven metres in height and pose a significant challenge.
Weather conditions were not the only challenges the crew faced, the seabed terrain was a further complicating factor.
The cutting-edge techniques that were used in this installation of a long haul power transmission cable will further benefit developments for offshore structures such as wind farms to be installed in greater depths and in more exposed sea areas – vital for the next generation of developments.
Global Marine Systems
www.globalmarinesystems.com
ABB
www.abb.co.uk Modus
www.modus-ltd.com
SUCCESSFUL COMPLETION AND EXPERIENCE FOR THE FUTURE The installation of the power cable was successfully completed on 17 May 2010 and the cable went live on 11 July 2010. The successful completion of this project demonstrates the ability to adapt to the unique cable handling and individual installation techniques required in these markets.
46
www.windenergynetwork.co.uk
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88 |
Page 89 |
Page 90 |
Page 91 |
Page 92 |
Page 93 |
Page 94 |
Page 95 |
Page 96 |
Page 97 |
Page 98 |
Page 99 |
Page 100 |
Page 101 |
Page 102 |
Page 103 |
Page 104 |
Page 105 |
Page 106 |
Page 107 |
Page 108 |
Page 109 |
Page 110 |
Page 111 |
Page 112 |
Page 113 |
Page 114 |
Page 115 |
Page 116 |
Page 117 |
Page 118 |
Page 119 |
Page 120 |
Page 121 |
Page 122 |
Page 123 |
Page 124 |
Page 125 |
Page 126 |
Page 127 |
Page 128 |
Page 129 |
Page 130 |
Page 131 |
Page 132 |
Page 133 |
Page 134 |
Page 135 |
Page 136 |
Page 137 |
Page 138 |
Page 139 |
Page 140 |
Page 141 |
Page 142 |
Page 143 |
Page 144 |
Page 145 |
Page 146 |
Page 147 |
Page 148