Overview of the Molikpaq Multi-Year Ice Load Reanalysis 2007 JIP

A Joint Industry Project (JIP) has been carried out from 2007-2010 to revisit the original data of the 1985-86 Amauligak I-65 deployment of the Molikpaq in the Beaufort Sea. The JIP focused on loads from multi-year ice, and took a fresh look at the instrumentation, ice conditions and analysis methods. The Molikpaq was equipped with various ice load measurement devices including strain gauges, extensometers, and Medof panels. Each type of instrumentation had its own peculiarities. Since the Medof pressure panels were the only instrument which made direct measurement of ice loads at the interface between the ice and the structure, they had an important role in the calibration of the extensometers and strain gauges. A new assessment of Medof panel performance suggests that the panels over predicted ice forces. The strain gauges installed in the steel hull of the Molikpaq were sensitive to the height at which the load was applied. The extensometers, which measured deflection of the structure’s faces, responded differently, depending on the distribution of ice loads across the structure face. A detailed review of available videos provided confirmation of failure modes and assisted in the determination of ice type and thickness. Uncertainties in instrument performance and ice thickness, as applied to average global ice pressures, are discussed. Results of this JIP suggest “Historical Case” ice loads and pressures of previous studies are about twice the level of the “Best Estimate Case” of this study. The conclusions reached in this paper are those of the authors, and permission to publish by the JIP participants does not imply that all JIP participants share the same conclusions as the authors.

• Record URL:
  http://www.poac.com/Papers/POAC11_80-192.zip
• Summary URL:
  http://www.poac.com/PapersOnline.html
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/03766756
• Supplemental Notes:
  • Abstract reprinted with permission of the International Conference on Port and Ocean Engineering Under Arctic Conditions (POAC).
• Corporate Authors:

  Port and Ocean Engineering under Arctic Conditions (POAC)

  ,    
• Authors:
  • Frederking, Robert
  • Hewitt, Kevin
  • Jordaan, Ian J
  • Sudom, Denise
  • Bruce, Jonathon
  • Fuglem, Mark
  • Taylor, Rocky S
• Conference:
  • 21st International Conference on Port and Ocean Engineering under Arctic Conditions (POAC'11)
  • Location: Montréal , Canada
  • Date: 2011-7-10 to 2011-7-14
• Publication Date: 2011

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; References;
• Pagination: 11p
• Monograph Title: POAC '11: Proceedings of the 21st International Conference on Port and Ocean Engineering under Arctic Conditions
• Serial:
  • Proceedings of the International Conference on Port and Ocean Engineering Under Arctic Conditions
  • Publisher: Port and Ocean Engineering under Arctic Conditions (POAC)
  • ISSN: 0376-6756
  • EISSN: 2077-7841
  • Serial URL: http://www.poac.com/PapersOnline.html

Subject/Index Terms

• TRT Terms: Instrumentation; Loads; Measurement; Offshore drilling platforms; Sea ice
• Geographic Terms: Beaufort Sea
• Subject Areas: Environment; Marine Transportation; Vehicles and Equipment; I15: Environment;

Filing Info

• Accession Number: 01563273
• Record Type: Publication
• Report/Paper Numbers: POAC 11-165
• Files: TRIS
• Created Date: May 18 2015 11:01AM