SYSTEMS APPROACH TO OFFSHORE CRANE SHIP OPERATIONS

A short historical survey of heavy-lift evolvement from the flat barge with a 200-ton crane to the 100,000-ton-displacement semisubmersible with up to 5000-ton lifting capacity is presented. Some of the more important steps to be considered in the design of heavy-lift ships are discussed with reference to crane type and specifications, deck space and loading, seakeeping and stability, mobility, accommodation, multipurpose functions such as pipelaying and others, anchor handling and automation in operations. The role of the crane ship in offshore construction is discussed and the concept of the "weather window" is explained with special emphasis on off- and on-line analysis methods utilized to minimize downtime and hence extend the operational window. The features of the Heavy Lift Operability (HELO) analysis are discussed and operability characteristics obtained for over 10 different ship types in different locations and under a variety of operational conditions are shown. A description of the Heavy Lift Monitoring and Predicting System (HELM) is given and results obtained during heavy-lift operations are evaluated. The paper demonstrates the use of state-of-the-art theory for the solution of offshore construction management and operational problems.

  • Supplemental Notes:
    • Paper presented at SNAME Annual Meeting, November 16-18, 1978.
  • Corporate Authors:

    Society of Naval Architects and Marine Engineers

    601 Pavonia Avenue
    Jersey City, NJ  USA  07306-2907
  • Authors:
    • Hoffman, D
    • Fitzerald, V K
  • Publication Date: 1978-9

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00184813
  • Record Type: Publication
  • Source Agency: Society of Naval Architects and Marine Engineers
  • Report/Paper Numbers: Paper No. 14
  • Files: TRIS
  • Created Date: Jan 13 1979 12:00AM