Offshore Cable Installation - Lillgrund - Vattenfall

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Figure 22. The water current affected position of the cable and the floaters during the pull-in. 6.2.2 <strong>Cable</strong> G02-F02 May 12, 2007 During the second cable laying between G02 and F02 the weather conditions were good. C/S Pleijel did not have any significant difficulties; the team just needed to do the work a couple of times to get into a routine. This time, during the post-lay survey of the cable, M/S Peter Madsen followed the diver at a larger distance and with the umbilical hanging off the front of the boat. The communication between C/S Pleijel and M/S Peter Madsen could have been better. It was frustrating for all involved when one party did not know what the other was doing. 6.2.3 <strong>Cable</strong> F02-E02 May 13, 2007 Communication problems were apparent when M/S Peter Madsen went to the wrong foundation to install this segment of cable. This was corrected, and work to improve the communication between the teams has continued since. 25 (30)
6.3 General comments on the inter-array cable installations 6.3.1 J-Tube Caps In every foundation there was a j-tube from the seabed to the top of the foundation, which was designed for the cable. One meter below the seabed, a bell-mouth with an enclosure cap, was mounted on the j-tube. The enclosure cap had to be removed before the cable pull-in, figure 23. Mud had filled in outside of the enclosure cap, requiring divers to vacuum the space before every pull-in so the cap could be removed. Because of the water current direction, clearing the space in front of the caps took 15 - 30 minutes each on the south sides of the foundations and up to two hours on the north sides of the foundations. 6.3.2 Inter-array cable pull-in Figure 23. The enclosure cap removed from the bell mouth. At each foundation location, C/S Pleijel began the operation by pulling the cable through the j-tube of the foundation, first, feeding the cable from the bell-mouth underwater up through the shaft and out of the foundation top. The other end of the cable was floated towards the second foundation, until it got within 30 - 40 meters from it, before the cable was pulled through that second foundation, figure 24. 26 (30)
Page 1 and 2: Offshore Cable Installation - Lillg
Page 3 and 4: Offshore Cable Installation - Lillg
Page 5 and 6: TABLE OF CONTENTS 1 INTRODUCTION...
Page 7 and 8: wind turbines and electrical system
Page 9 and 10: There are 48 inter array cables in
Page 11 and 12: platform, was installed on the seab
Page 13 and 14: The weather limitations depend on t
Page 15 and 16: Figure 9. To the right of the pictu
Page 17 and 18: December 3, 2006: Figure 11. An ext
Page 19 and 20: Figure 14. The cable pull-in at the
Page 21 and 22: Due to the importance of exact navi
Page 23 and 24: Figure 18. The linear cable engine
Page 25: Figure 21, below, presents the plot
Page 29 and 30: 6.3.3 On the foundations To ensure
Page 31: During the cable laying, when the t

Offshore Cable Installation - Lillgrund - Vattenfall

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