OPERATIONAL LIMITATIONS OF OFFSHORE CRANE VESSELS

The limiting conditions of crane vessel operations are analyzed, with special emphasis on large semisubmersibles. As reference structures, a barge with 500 t crane capacity, a ship with 1,800 t capacity and a semisubmersible with two revolving 6,000 t cranes are investigated. Model tests in irregular seas and specific wave groups demonstrate the significance of coupled resonance motions of vessel and suspended load for crane operations with semisubmersibles. With barges and ships, resonance is of minor importance owing to high damping. The mass of the suspended load and the sling length are decisive parameters for the motion characteristics of crane vessels. The transfer function of the vertical load motion, which is selected as limiting quantity, has been determined experimentally for each of the three vessels. Depending on this parameter and the maximum allowable load motion, the limiting wave heights for crane vessel operations are compiled.

  • Supplemental Notes:
    • Conference paper; Paper OTC-6217
  • Authors:
    • Clauss, G F
    • Riekert, T
  • Conference:
  • Publication Date: 0

Media Info

  • Features: References;
  • Pagination: 8p.

Subject/Index Terms

Filing Info

  • Accession Number: 00660823
  • Record Type: Publication
  • Source Agency: Maritime Technical Information Facility
  • Files: TRIS
  • Created Date: Jul 21 1994 12:00AM