Accession Number : ADA119320

Title :   The Use of Buoyancy to Lift Heavy Objects from the Sea.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Fiske,Richard Paul

PDF Url : ADA119320

Report Date : Jun 1981

Pagination or Media Count : 138

Abstract : To recover oil from economically marginal offshore fields the re-use of production platforms has been considered. Re-use involves severing the jacket from the seabed, rotating the jacket to the horizontal and lifting it through the air/sea interface in a configuration suitable for towing. Five systems are considered for use in the recovery process. Two systems currently used for installation are found suitable for modification to recover jackets. They are the pontoon barge system and the self-floating tower. Major problems to be overcome in modifying for retraction are mating of the pontoon barge with the tower, developing a pile system which can be refurbished, and ensuring transverse stability on retraction through the air/sea interface.

Descriptors :   *Offshore structures, *Marine engineering, Hydrostatics, Platforms, Recovery, Buoyancy, Lift, Barges, Towers, Stability, Floating platforms, Pontoons, Theses

Subject Categories : Marine Engineering
      Fluid Mechanics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE