TRANSPORT AND INSTALLATION OF PROTECTIVE BARRIER EKOFISK 2/4 TANK

After an engineering and construction period of 16 months both halves of the protective barrier for the Ekofisk 2/4 tank were ready for towout and installation. To enable installation of one half immediately after the other, they left the construction site with a gap of one day. Consequently 18 towing vessels with 2215t bollard pull were mobilised, the largest towing fleet ever assembled. The structures had to pass neighbouring installations with clearances of 10m and the acceptable final positioning inaccuracy was less than 0.2m. A shutdown of the Ekofisk field was not acceptable. Several installation systems were used together with detailed preparation and training. In the successful installation the achieved positional accuracy was within 0.05m of the target. The paper outlines several operational aspects of the successful towing and installation and shows the feasibility of positioning large gravity structures with very high accuracies.

• Supplemental Notes:
  • 22nd Annual Offshore Technology Conference, held 7-10 May 1990, Tx, USA. Proceedings, v 4 Paper OTC 6472, p 437 [16 p, 4 ref, 22 fig]
• Authors:
  • Donoclift, P
  • Gijzel, T G
• Publication Date: 1990

Language

• English

Subject/Index Terms

• TRT Terms: Building; Facilities; Installation; Offshore structures; Positioning
• Old TRIS Terms: Positioning systems
• Subject Areas: Bridges and other structures; Construction; Maintenance and Preservation; Marine Transportation;

Filing Info

• Accession Number: 00698713
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM