Although crane ships have performed well in the Southern and central section of the North Sea, their efficiency has been impaired when moving North because of the increasing swell and wave patterns. Heerema Engineering Service at the Hague has solved the problem with a computer-directed "instant" stabilising system which enables a semi-submersible to handle loads of 3,000 tons safely. Heerema has designed a two-crane semi-submersible and conducted extensive model tests to examine the stability and behaviour of the vessel under a variety of sea conditions. The tests were so successful that two such vessels were ordered from Japan; each will feature two fully revolving cranes, one with a lifting capacity of 3,000 tons and the other of 2,000 tons. The first vessel will be delivered in September 1978 and the second in February 1979 and will be equipped with four 300-ton, 17.40-m long winches, and with "Flipper" Delta anchors, each weighing 22.5 tons.

  • Availability:
  • Corporate Authors:

    Uitgeverij C.E. Radius en P. Gruppelaar

    Box 277
    Dordrecht 3400,   Netherlands 
  • Publication Date: 1977-12

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00178191
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Jul 19 1978 12:00AM