THE EXPERIMENTAL AND THEORETICAL STUDY OF A TENSION LEG PLATFORM IN DEEP WATER

The offshore industry is going into deep water exceeding 3,000 ft. The tension leg platform is available for exploratory drilling, supporting production equipment, and workover operations in such deep water. The moored stable platform with a buoyancy exceeding the weight has tensioned vertical anchor cables. The tension leg generally consists of wire ropes with elasticity that cannot be ignored in deep water. In order to evaluate the effect of elasticity of the anchor lines in deep water, a 1/50 scale model was made of a tension leg platform that has four vertical cylinders and four anchor lines. Hydrodynamic forces acting on the cylinders were calculated by considering the radiation and wave exciting forces vertically and the drag and inertia forces horizontally. Theoretical study and model experiments indicated that more elasticity in the tension cables would result in less tension variation of the cables in motion response by waves. Nonlinearity of motion response to regular waves under steady-state forces such as wind, current and wave drift were investigated.

Media Info

  • Features: References;
  • Pagination: p. 849-856

Subject/Index Terms

Filing Info

  • Accession Number: 00138265
  • Record Type: Publication
  • Source Agency: Offshore Technology Conference
  • Report/Paper Numbers: V3, OTC 2690 Proceeding
  • Files: TRIS
  • Created Date: Sep 4 1976 12:00AM