ADJUSTABLE PONTOONS INCREASE SHIP STABILISATION

A new stabilizing system, which has been tank-tested on the model scale at the Technical Universities of Copenhagen and Trondheim, comprises one or two pontoons, which can be ballasted and fitted to vertical columns beneath the bottom of a ship. They are retracted against the hull during passage, and on site are lowered to depths which can be adjusted to suit prevailing weather conditions to give the best motion behavior. The tests were performed on a 1/32-scale model of a 660-ft, 40,000-dwt offshore-oilfield utility vessel with one stabilizing pontoon forward and one aft, in a Jonswap spectrum for random seas representative of over 90% of sea conditions in the Ekofisk and Statfjord areas. The pontoons increased the natural periods of heave, pitch, and roll by 40, 27, and 20% respectively; the reduction in heave acceleration was about 50% and the estimated heave amplitude in 5-m waves was reduced from 6 ft to 2 ft. Order from BSRA as No. 49,259.

  • Corporate Authors:

    Gulf Publishing Company

    Box 2608
    Houston, TX  USA  77001
  • Publication Date: 1977-8

Media Info

  • Pagination: p. 50
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00188144
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Feb 27 1979 12:00AM