A method of launching an elongate subsea structure such as a pipeline bundle unit into water comprises providing buoyant support to the structure by displacing water with a hollow buoyancy unit that applies buoyant upthrust to the structure. By lowering the buoyancy unit in the water to bring a permanently open aperture of the buoyancy unit beneath a surface level of the water, the buoyancy unit is flooded with water through the or each permanently open aperture to reduce the buoyant upthrust applied to the structure.
Launching elongate subsea structures
2020-12-24
Patent
Elektronische Ressource
Englisch