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Single-lift removal of the complete 23,000-tonne Ninian Northern platform from the North Sea and transport to shore for disposal.
Company : CNRI
Location : U.K. North Sea, 160 km northeast of Shetland
Removal : 2020 (topsides), 2022 (jacket)
141 m
Water depth
Scope of work
- Engineering, preparation, removal & disposal (ERPD) of 14,200-tonne topsides & 8500-tonne jacket
- Transfer of topsides & jacket from Pioneering Spirit to Iron Lady for load-in to Veolia Peterson yard at Dales Voe, Shetland
- Pre-lift preparations (incl. removal / separation of pipework and obstacles, & installation of support stools & grillage)
- Design, fabrication and installation of bearing blocks onto jacket legs to engage with horseshoes (lifting tools) to perform lift
- Cutting and seafastening of the platform legs (prior to topsides lift)
- Design & fabrication of horseshoe lifting units, support stools & grillage.
- Design & fabrication of jacket work platforms & rigging
14,200-tonne & 8500-tonne
ERPD oftopsides & jacket
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Specials & challenges
- First-time use of horseshoes & extension pieces for topsides lift
- Complete cutting of platform legs one year prior to the single lift
- First-time in-port transfer of topsides from Pioneering Spirit to Iron Lady
- First commercial lift with new Jacket lift system (JLS)
- Preparation time of more than 3 years
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