MONOCONE--A MOBILE GRAVITY PLATFORM FOR THE ARCTIC OFFSHORE

This paper discusses a mobile, gravity platform for year-round petroleum operations in the Canadian Beaufort Sea. The "Monocone" is a coined name derived from "Monopod" which alludes to the platform's single structural column rising from the centre of a circular base, and "Cone" which refers to a movable conical collar selectively positioned on this column. The conical collar causes the ice to fail in flexure and at minimum loads by maintaining a constant water line diameter in different water depths. Ice and wave forces constitute the main loading conditions and these were developed theoretically and experimentally, the latter in ice model basins and in a wave tank. The environmental conditions and structural and foundation design of this prestressed concrete and steel structure are discussed, as well as model tank tests on seakeeping, towing, and lowering and raising procedures. The conical collar, if sufficiently large would allow controlled, near-vertical setdown of the platform to bottom in any water depth. In this paper, a "Monocone" platform for a maximum design water depth of 41.0 m is discussed.

• Supplemental Notes:
  • Proceedings of the 4th International Conference on Port and Ocean Engineering under Arctic Conditions (POAC 77), Newfoundland Memorial University, Canada, September 26-30, 1977.
• Corporate Authors:

  POAC Conference 77

  ,    
• Authors:
  • Jazrawi, W
  • Khanna, J
• Publication Date: 1977

Media Info

• Features: References;
• Pagination: 15 p.

Subject/Index Terms

• TRT Terms: Design; Force; Gravity structures; Ice; Offshore platforms; Operations; Structural design
• Uncontrolled Terms: Design criteria
• Geographic Terms: Arctic Regions
• Old TRIS Terms: Arctic operations; Ice forces on structures; Model testing; Offshore platform design
• Subject Areas: Administration and Management; Bridges and other structures; Design; Marine Transportation;

Filing Info

• Accession Number: 00167691
• Record Type: Publication
• Source Agency: Memorial University of Newfoundland, Canada
• Report/Paper Numbers: Proceeding
• Files: TRIS
• Created Date: Jan 13 1978 12:00AM