EMPLACEMENT OF A HEAVY LOAD ONTO A SEAFLOOR FOUNDATION: CONCEPT DEVELOPMENT AND ANALYSIS

Emplacement of a heavy load by cable from the surface onto a seafloor foundation in the deep ocean to an accuracy of 1 foot may require a secondary positioning system to supplement the basic ship's stationkeeping. Four possible systems to effect this control are thrusters mounted just above the load, four-point moor with winches mounted above the load, single-point moor with one winch, one thruster, and a rudder, and hauldown system with load-mounted winch. Analysis of load/cable dynamics and operational considerations show that for emplacement of heavy loads (20 to 100 tons), thrusters of 1,000 to 2,000 pounds thrust would be needed, or submersible winches of 5,000-pound capability, or a hauldown winch of 10,000-pound capacity at a constant tension.

• Corporate Authors:

  Naval Civil Engineering Laboratory

  Port Hueneme, CA  United States 
• Authors:
  • Wilson, J V
  • Hitchcock, R D
  • Mittleman, J R
• Publication Date: 1972-7

Media Info

• Pagination: 84 p.

Subject/Index Terms

• TRT Terms: Cables; Dynamic positioning; Dynamics; Mooring; Moorings; Thrusters; Underwater construction
• Old TRIS Terms: Cable dynamics; Positioning control systems
• Subject Areas: Marine Transportation; Terminals and Facilities; Vehicles and Equipment;

Filing Info

• Accession Number: 00041275
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: NCEL-TR-769 Final Rpt
• Files: TRIS
• Created Date: Feb 23 1973 12:00AM