Offshore Cable Installation - Lillgrund

TABLE OF CONTENTS
1     
INTRODUCTION........................................................................................ ........... 5
2      THE LILLGRUND OFFSHORE WIND FARM ....................................................... 5
2.1   General project information  ......................................................................... 5
2.2   Cable installation organisation  ..................................................................... 6
2.3   Lillgrund cable system  ................................................................................. 6
2.3.1     Cable design  .................................................................................. 8
3      SUPERVISION  ... . 9
3.1   Export cable  ................................................................................................. 9
3.2   Inter Array  cables......................................................................................... 9
4      METHOD DESCRIPTION – OFFSHORE CABLE INSTALLATION...................... 9
4.1   Procedures  ................................................................................................ 10
4.1.1     Survey prior trenching..................................................................  10
4.1.2    Trenching  ..................................................................................... 11
4.1.3    Soil  ............................................................................................... 11
4.1.4     Cable laying  ................................................................................. 11
4.1.5     Weather limitations  ...................................................................... 11
4.1.6     Diving  restrictions......................................................................... 12
5      EXPORT CABLE  ................................................................................................ 12
5.1   Cable loading  ............................................................................................. 12
5.1.1     Arrangement at the factory .......................................................... 12
5.1.2     Loading  ........................................................................................ 14
5.1.3     Pre-laying and bad weather conditions........................................ 15
5.2   Pull-in of the cable  ..................................................................................... 16
5.3   Offshore  laying...........................................................................................  19
6      INTER-ARRAY  CABLES..................................................................................... 19
6.1   Inspection of C/S Pleijel  6/5-07.................................................................. 19
6.1.1     Cable  path.................................................................................... 20
6.2   Installation of the first three inter-array cables  ........................................... 23
6.2.1     First cable G02-H02 May 11, 2007 .............................................. 23
6.2.2     Cable G02-F02 May 12, 2007...................................................... 25
6.2.3     Cable F02-E02 May 13, 2007 ...................................................... 25
6.3   General comments on the inter-array cable installations........................... 26
6.3.1     J-Tube Caps  ................................................................................ 26
6.3.2     Inter-array cable pull-in  ................................................................ 26
6.3.3     On the foundations.......................................................................  28
7      COMMENTS AND CONCLUSIONS ...................................................................  29
7.1   Weather dependent operation  ................................................................... 29
7.2   Method  ... ... 29
7.3   Environmental impact of the installation operation .................................... 29
8      REFERENCES  ...................................................................................................  30

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